CN1816734A - Method for operating a process-measuring device - Google Patents
Method for operating a process-measuring device Download PDFInfo
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- CN1816734A CN1816734A CN 200480018821 CN200480018821A CN1816734A CN 1816734 A CN1816734 A CN 1816734A CN 200480018821 CN200480018821 CN 200480018821 CN 200480018821 A CN200480018821 A CN 200480018821A CN 1816734 A CN1816734 A CN 1816734A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
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Abstract
Disclosed is a process measuring apparatus comprising a flow sensor that is provided with a measurement tube, an excitation arrangement, a sensor array for generating a measuring signal, and an operation and evaluation circuit. Also disclosed is a method for compensating interference potentials caused particularly by particles of foreign substances or small air bubbles in the liquid that is to be measured. According to said method, an anomaly in the progress of the measuring signal caused at least in part by an electrical, especially pulsed, interference voltage, is detected by identifying a data cluster within the stored first set of data, which digitally represents the anomaly. Additionally, the data that is part of said data cluster is removed from the stored first set of data in order to create an interference-free set of data.
Description
The present invention relates to a kind of method that is used for the operating process measurement instrument, utilize hold in this Process meter measuring process container or the process pipeline at least a the physical measurement amount, particularly flow, viscosity etc. of the testing medium that flows.Especially, the present invention relates to a kind of method that is used to operate magnetic induction flowmeter, the volumetric flow rate of the mobile testing liquid of this flowmeter survey conduction.
In the industrial process measuring technique, particularly in the robotization of chemical industry or other industrial process,, represent such as the analog or digital of process variable in order to produce the in-site measurement value signal, use so-called field apparatus, near the Process meter of just process, installing.The example of known this Process meter has detailed description: EP-A 984 248 in following patent documentation for those skilled in the art, EP-A 1 158 289, US-A 38 78 725, US-A 43 08754, US-A 44 68 971, US-A 4 524 610, US-A 45 74 328, US-A 45 94584, US-A 46 17 607, US-A 47 16 770, US-A 47 68 384, US-A 48 50213, US-A 50 52 230, US-A 51 31 279, US-A 52 31 884, US-A 53 59881, US-A 53 63 341, US-A 54 69 748, US-A 56 04 685, US-A 56 87100, US-A 57 96 011, US-A 60 06 609, US-B 62 36 322, US-B 63 52000, US-B 63 97 683, WO-A 88 02 476, WO-A 88 02 853, WO-A 95 16897, WO-A 00 36 379, WO-A 00 14 485, WO-A 01 02816 or WO-A 02,086 426.
The example of the process variable of surveying is for example to guide in corresponding process vessel (for example pipeline or water tank) or volumetric flow rate, mass rate, density, viscosity, material level, pressure or the temperature etc. of the process medium of the liquid, gas, steam or the gas form that hold.
In order to survey corresponding process variable, Process meter has the measuring transducer that is generally physics-electronics accordingly, it is placed in the wall of a container of bootup process medium or in the route of the process pipeline of bootup process medium, and be used to produce at least one measuring-signal, electric measurement signal particularly, it as far as possible accurately represents main detection process amount.For this reason, measuring transducer also links to each other with the suitable measurement instrument electronic installation especially for further handling or analyze at least one measuring-signal.This electronic installation generally includes function circuit that drives measuring transducer and measurement and the analysis circuit that is used for further handling its measuring-signal.
The Process meter of described type links together by the data transmission system that is connected to the measurement instrument electronic installation usually, and/or link to each other with corresponding process computer, Process meter for example by (current loop of 4mA～20mA) and/or by digital data bus to this computing machine transmission measurement value signal.In this case as data transmission system be field bus system, serial field bus system particularly, the PROFIBUS-PA, the FOUNDATION FIELDBUS that for example have the respective transmissions agreement.The measured value signal of transmission can be utilized process computer and further handle, and as corresponding measurement result and for example visual on monitor, and/or be converted to the control signal that is used for process regulating brake (such as solenoid valve, motor etc.).
In order to hold the measurement instrument electronic installation, this Process meter also comprises electronic device housing, it is for example advised in US-A 63 97 683 or WO-A 00 36 379, can be coupled away from Process meter also only passes through flexible cable, perhaps it is for example shown in EP-A 903 651 or the EP-A 1 008 836, directly is arranged on the measuring transducer or is holding individually on the measuring transducer shell of measuring transducer.For example shown in EP-A 984248, US-A 45 94 584, US-A 47 16 770 or the US-A 63 52 000, electronic device housing is often used for holding some mechanical organ of measuring transducer, such as the film like of being out of shape owing to mechanical effect during operation, bar-shaped, cover tubular or tubular shape variant or oscillating body; About this point, referring to US-B 63 52 000 above-mentioned.
In order to measure conductive fluid, often use flowmeter with magnetically inductive cross-flow sensor.If desired, for the sake of simplicity, incite somebody to action only reference flow transmitter or flowmeter below.Just as is known, magnetic induction flowmeter allows to measure the volumetric flow rate of the conductive fluid that flows in pipeline, and will represent this measurement result with the form of corresponding measured value; So,, measure the flow through liquid volume of cross-section of pipeline of per unit time according to definition.The structure of magnetic induction flowmeter and mode of operation are known for those skilled in the art and detailed description: DE-A 43 26 991, EP-A1 275 940, EP-A 12 73 892, EP-A 1 273 891, EP-A 814 324, EP-A 770 855, EP-A 521 169, US-A 60 31 740, US-A 5,487 310, US-A 52 10 496, US-A 44 10 926, US-A 2002/0117009 or WO-A01/90702 are for example arranged in following document.
The flow transmitter of described type has non-ferromagnetic body examination buret usually separately, and it feeds pipeline in the close mode of liquid, for example utilizes flange or is threaded.The part of measuring tube contact liq is normally nonconducting, thereby does not have short circuit in the voltage that the magnetic field of cutting measuring tube is responded in liquid according to the Faradic electricity magnetic induction principle.The common inside of metal measuring tube also has non-conductive layer, for example rubberite, polyvinyl fluoride etc., and they oneself normally non-ferromagnetic body; On the contrary, in the situation that measuring tube integral body is made by plastics or pottery, particularly aluminium oxide ceramics, non-conductive layer is optional.
Utilize two coil devices to produce magnetic field, each coil device all is installed on the measuring tube outside along the diameter of measuring tube usually.Each coil device generally includes air core coil or has the coil of soft magnetic material core.Even as far as possible for guaranteeing the magnetic field that is produced by coil, in the most common and the simplest situation, coil is by equal and series connection conductively, thereby they can be passed by identical exciting current at work.Yet, knownly on equidirectional and reverse direction, alternately transmit exciting current, can determine for example liquid viscosity and/or turbulent extent by coil; About this point, referring to EP-A 1 275 940, EP-A 770 855 or DE-A 43 26 991.Just now the exciting current of mentioning is produced by operating electronic devices; Electric current is adjusted to steady state value, and for example 85mA, and its direction periodically oppositely.Current reversal is by comprising so-called T type network or so-called H type network is realized in coil; About Current Regulation and current reversal, referring to US-A 44 10 926 or US-A 60 31 740.
The induced potential of mentioning flows between electricity (that is, owing to liquid becomes wet) potential electrode or between at least two electric capacity (that is, for example being arranged within the tube wall of measuring tube) potential electrode at least two, wherein each electrode detection electromotive force.In modal situation, potential electrode is installed in position relative on the diameter, makes their common diameter perpendicular to the direction in magnetic field, thereby and perpendicular to the residing diameter of coil device.Induced potential is exaggerated, and the analyzed circuit conditioning of voltage of amplifying, and to obtain measuring-signal, this measuring-signal is recorded, indicates or further handles.Those skilled in the art for example can be from the suitable analytical electron device of following literature: EP-A 814 324, EP-A 521 169 or WO-A 01/90702.
In principle, absolute value at each electrode place electromotive force is nonsensical for the measurement of volumetric flow rate, but the dynamic range of the differential amplifier only after electromotive force is arranged in electrode (just, this amplifier must be by the electromotive force overexcitation) and the little condition of the reverse frequency difference of the frequency of electromotive force and above-mentioned direction of current under, be only such.
The electromotive force at each electrode place not only depends on according to the magnetic field of faraday's principle (this dependence relate to how much/bulk of measuring tube and the characteristic of liquid), also depend on this measuring-signal, this signal be based on faraday's principle and should be clean as far as possible, be applied the different types of interference electromotive force on it, as what in EP-A 1 273 892 or EP-A 1 273 891, discussed.These interference potentials can cause measuring accuracy to reduce.
First kind of interference potential is to be derived from perception and/or capacitive interference, and described interference source is from the electric charge of the electric capacity of coil device and lead and the boundary layer existence of change between electrode and liquid.As the asymmetric result of the concrete structure of flow transmitter, particularly consider to lead to the conductor of coil device and potential electrode, the interference potential of an electrode is different with the interference potential of another electrode usually.
This first effect may limit the dynamic of differential amplifier on the one hand.On the other hand, the difference between the interference potential of electrode is changed in the flow transmitter parameter owing to manufacturing tolerance.And electrode potential partly is owing to this effect for the dependence determined of liquid velocity, because when low speed, the above-mentioned electric charge at the place, boundary layer between electrode and liquid is not removed by liquid.
Second kind of interference potential is to bring and the foreign matter particle or the bubble that clash into electrode causes that it causes the sudden change of electrode potential owing to liquid.Depend on kind of liquid the time delay of these changes, and usually greater than the rise time that changes.
The measuring-signal that this second effect also leads to errors.Mistake also depends on electrode potential.Because as what explain above, this electromotive force is because manufacturing tolerance and changing for each flow sensor on first effect, makes that the performance difference of each flow transmitter unit is very big so second effect is added to, and yes does not expect very much for this.
The third effect is to cause owing to coating that liquid deposits on potential electrode, as for example in US-A 52 10 496 explanations.The row of coating becomes mainly to depend on liquid velocity.The difference of each flow transmitter unit performance can further increase by the formation of coating.
EP-A 1 273 892 has advised a kind of method of operating magnetically inductive cross-flow sensor, wherein by utilizing analysis and function circuit potential pulse to be applied at least one of two potential electrode at least off and on, prevent the development of any above-mentioned interference potential, perhaps reduced their influence at least.Make the precision that can cause significantly improving electromagnetic flowmeter in this way, particularly in the situation of single-phase or well-mixed multi-phase fluid.In addition, for example in EP-A 337 292 or WO-A 03/004977, such method has been described, wherein especially by being shorted to the earth with time sequencing or by applying harmonic alternating current voltage, potential electrode has been eliminated the sparking voltage of interference potential in the time that prolongs.
The measuring method of this prior art and use a shortcoming of the flow transmitter of this method to be; in the situation of multi-phase fluid or in the situation of mucilage liquid with clear liquid phase of separating; particularly imponderable foreign matter particle or the bubble of sweeping along that for example has quite at random disturbed, and this almost can not be demarcated.For corresponding degree, at least the second kind of interference potential can not enough be removed from potential electrode reliably.
Therefore, the purpose of this invention is to provide a kind of method, thereby can compensate the interference potential that in the measuring-signal of flow transmitter, is coupled to a great extent, particularly second kind of interference potential, make and to obtain to be independent of basically this interference potential, the particularly measured value of second kind of electromotive force.
For this reason, the invention provides the particularly method of magnetic induction flowmeter of a kind of operating process measurement instrument, this Process meter has the measuring tube that inserts the pipeline that flow media particularly flows through, and the method comprising the steps of:
-make MEDIA FLOW through measuring tube;
The flow through function circuit of flowmeter of the particularly ambipolar exciting current of-order, with drive arrangement on measuring tube and act on measuring tube and/or the exciting bank of the medium of wherein flowing through;
-utilize the sensor device be arranged on the measuring tube to produce at least one electric measurement signal corresponding to the physical measurement amount;
-digitized measurement signal or its part at least are to generate the digital sampling sequence of the time distribution of represent measuring-signal;
-storage at least a portion digital sampling sequence, generating first data set, but its represent instantaneously preset time at interval within time of measuring-signal distribute;
-digitally represent unusual data set by detecting within first data set of storage, detect to small part since the measuring-signal time that the interference potential of the particularly pulse shape that comprises in measuring-signal causes in distributing unusually;
-extract the data that belong to described data set out from first data centralization of storage, to generate glitch-free second data set; With
-use described second data set, determine the measured value of the physical quantity of the fluid that representative is flowed.
In addition, the invention provides the magnetic induction flowmeter that is used at the mobile fluid of pipeline, it comprises:
-insert the measuring tube of pipeline, be used to guide fluid;
-analyze and function circuit;
-by the device of analyzing and function circuit is presented, the magnetic field that is used to produce the cutting measuring tube, this device comprises the coil device that is installed on the measuring tube and is energized the electric current process;
-at least two potential electrode are used for detecting the electromotive force flowing through measuring tube and being inducted by the fluid of magnetic field intercepts;
-be connected to the device of potential electrode at least off and on, be used for generating at least one measuring-signal from the electromotive force that detects by potential electrode; With
-be used to store the device of first data set, but this first data set constitute by digitized measurement data and instantaneous represent preset time at interval in the time distribution of measuring-signal;
-wherein analyze and function circuit
--according to first data set, detect in measuring-signal since the interference potential that occurs at least one potential electrode cause unusually;
--remove the unusual of detection from first data centralization of storage, and generate the second unusual data set that does not detect; With
--utilize N/R second data set, generate at least one measured value of the physical quantity of the mobile fluid of representative.
In first preferred embodiment of method of the present invention, second data set also comprises the digital measurement data that comprise in first data centralization at first.
In second preferred embodiment of method of the present invention, detect unusual step and comprise the step of determining very first time value according to first data set, this time value representative is corresponding to the zero hour of the interference voltage of interference potential.
In the 3rd preferred embodiment of method of the present invention, the step of determining very first time value comprises that wherein first fiducial value surpasses first threshold with signal indication with the numerical data and the first threshold comparison that can be scheduled to and the step that generates first fiducial value of first data set.
In the 4th preferred embodiment of method of the present invention, detect unusual step and comprise the step of determining second time value according to first data set, this time value is represented the finish time of interference voltage.
In the 5th preferred embodiment of method of the present invention, the numerical data that the step of determining second time value comprises comparison first data set with can be scheduled to second threshold value and generate the step of second fiducial value, this second fiducial value is lower than second threshold value with signal indication.
In the 6th preferred embodiment of method of the present invention, detect unusual step and comprise the step of determining amplitude according to first data set, but the amplitude of this amplitude representative measuring-signal within the preset time interval, particularly maximum absolute amplitude.
In the 7th preferred embodiment of method of the present invention, detect unusual step and comprise the step of determining the 3rd time value according to first data set, but the amplitude of the 3rd time value representative measuring-signal within the preset time interval, the moment that particularly maximum absolute amplitude takes place.
In the 8th preferred embodiment of method of the present invention, detect unusual step and comprise the step that forms the mistiming between the very first time value and second time value, the 4th time value of the duration of interference voltage takes place to determine representative.
In the 9th preferred embodiment of method of the present invention, detect unusual step and comprise comparison amplitude and the 3rd particularly variable during operation threshold value that can be scheduled to, and generate the step of the 3rd fiducial value, the 3rd fiducial value surpasses the 3rd threshold value with signal indication.
In the tenth preferred embodiment of method of the present invention, the step that generates glitch-free second data set comprises that the particularly digitized measuring-signal of use determines the step of the mean value of the voltage of inducting in the fluid that flows.
In the 11 preferred embodiment of method of the present invention, the step that generates glitch-free second data set comprises that the numerical data of using first data set determines the step of the mean value of the voltage of inducting in the fluid that flows.
In the 12 preferred embodiment of method of the present invention, the step that generates glitch-free second data set comprises that service time, value was determined the step of the mean value of the voltage of inducting in the fluid that flows less than the numerical data of very first time value.
In the 13 preferred embodiment of method of the present invention, the step that generates glitch-free second data set comprises that service time, value was determined the step of the mean value of the voltage of inducting in the fluid that flows greater than the numerical data of second time value.
In the 14 preferred embodiment of method of the present invention, the step that generates glitch-free second data set comprises artificial three data set of use from the generation of the partial data at least numerical data of the unusual data set of representative, and the time of the approximate interference voltage of the 3rd data set distributes.
In the 15 embodiment of method of the present invention, the step that generates artificial the 3rd data set comprises at least one penalty function of step determine to(for) at least a portion numerical data of the unusual data set of representative.
In the 16 embodiment of method of the present invention, the step that generates artificial the 3rd data set comprises that use generates the step of numerical data from the data value of representing unusual data set and the definite penalty function of use.
In the 17 embodiment of method of the present invention, the step that generates noiseless second data set comprises the step of the difference between the data value of data value being formed on the unusual data set of representative and artificial the 3rd data set, and these two are used to form poor data value and have corresponding particularly identical time value.
In the 18 preferred embodiment of method of the present invention, the step that generates at least one penalty function comprises the particularly step of time constant of at least one coefficient that use determines penalty function from the data value of the unusual data set of representative.
In the 19 preferred embodiment of method of the present invention, the step that generates at least one penalty function comprises use for the instantaneous definite mean value of voltage of inducting in the fluid that flows, and determines for the coefficient of the penalty function step of time constant particularly.
In the 20 preferred embodiment of method of the present invention, the step of determining the coefficient of penalty function comprises and being formed on from first data value of the unusual data set of representative and first poor between the instantaneous definite mean value of the voltage of inducting in the fluid that flows, be formed on from second data value of the unusual data set of representative and second poor between the instantaneous definite mean value of the voltage of in the fluid that flows, inducting, and the step that forms first difference and second merchant who differs from.
In the 21 preferred embodiment of method of the present invention, the step of determining the coefficient of penalty function comprises the Serial No. that generates the interim coefficient that is used for penalty function and the step of filtering figure sequence recursively particularly digitally.
In the 22 preferred embodiment of method of the present invention, the step that generates the 3rd data set comprises the step of determining for from least the second penalty function of the numerical data of second portion at least of the unusual data set of representative.
Further developing of the method according to this invention, the exciting bank of use comprises coil device, is used to produce magnetic field, particularly cuts the magnetic field of the medium that guides in measuring tube.
According to the preferred embodiment that this further develops of the present invention, the sensor device of use comprises the potential electrode that is arranged on the measuring tube, and this method may further comprise the steps:
-utilize exciting bank to produce the also magnetic field of cutting fluid;
-induced potential in the fluid that flows is used to change the electromotive force that is applied to potential electrode; With
-carrying-off is applied to the electromotive force of potential electrode, is used to produce at least one measuring-signal.
Basic thought of the present invention is, unusual according to corresponding to interference potential, particularly directly and in time range or in sample range, repeatedly detect the interference potential of marked change at least one measuring-signal, described occur in unusually in or in the data centralization of the stored digital that obtains from measuring-signal by at least one measuring-signal of the sensor device transmission of flow transmitter.Replace it by removing, create the real data collection that part is made of artificial computational data raw measurement data and part corresponding to unusual numerical data and with the data of calculating.
The present invention is based on following surprising discovery: although the interference potential of described kind may distribute on height random ground, but that detects has typical distribution or a typical form unusual usually, its identification both can be identified in this interference potential of the data centralization of the stored digital that obtains from measuring-signal, also can eliminate this interference potential by the numerical data that manual operation (particularly by non-linear, digital filtering) is influenced by interference potential, the information that wherein originally is included in the relevant measured physical quantity in the measuring-signal is kept on the one hand largely, and can very promptly be used for determining measured value on the other hand.
Present time diagram and the illustrative circuitry that provides in reference to the accompanying drawings explained method of the present invention in detail and further developed, in the accompanying drawing:
Fig. 1 a, b have schematically partly shown the Process meter that is applicable to execution method of the present invention with the block diagram form, and it is the form of magnetic induction flowmeter here;
Fig. 2 a schematically illustrates the time diagram of the exciting current that operating period of the Process meter of Fig. 1 a, 1b flows;
Fig. 2 b, c; Fig. 3 a, b; Fig. 4 a, b; Fig. 5 a, b schematically illustrate Fig. 1 a, 1b Process meter operating period measurable electromotive force time diagram;
Fig. 6 a, b schematically illustrate Fig. 1 a, 1b Process meter operating period stored digital the measurement Potential Distributing.
Fig. 1 has schematically partly shown the Process meter that is applicable to execution method of the present invention with the block diagram form, and it is the form of magnetic induction flowmeter here.Process meter is used for generating the particularly measured value of at least one physical quantity of fluid of the mobile medium of pipeline (not shown).For example, flowmeter can be used to measure the volumetric flow rate and/or the flow velocity of conducting liquid.
Here Shuo Ming flowmeter comprises: flow transmitter 1 is used to generate the measurement electromotive force corresponding to measured physical quantity; Function circuit 2 is used to survey and measures electromotive force and generate at least one measuring-signal corresponding to physical quantity; With analysis circuit 3, thereby be used for control operation circuit 2 and Control Flow transmitter 1, and use at least one measuring-signal to generate the measured value of represents physical amount.Function circuit 2 and some elements that also have a flow transmitter 1 can for example be contained in the electronic device housing 10 of flowmeter, as schematically showing among Fig. 1 a.
In order to prevent to produce short circuit, make the interior section of measuring tube 11 of contacting with fluid non-conductive for the voltage of in fluid, inducting.For this reason, metal measuring tube inside often has non-conductive layer, for example rubberite, polyvinyl fluoride layer etc., and normally non-ferromagnetic body; In the situation that measuring tube integral body is made by plastics or pottery, particularly aluminium oxide ceramics, non-conductive layer is optional.
In this example, the flowmeter exciting bank that is driven by the drive electronics in the function circuit 2 21 comprises first field coil 12 and second field coil 13, and they all are arranged on the measuring tube 11.Field coil 12,13 is positioned on first diameter of measuring tube 11.Exciting bank is used for producing in operation the magnetic field H of the fluid of cutting tube wall and flowing pipe.As the exciting current I that drives by drive electronics 21 during through field coil 12,13, set up this magnetic field, field coil 12,13 is connected in series in this embodiment.Preferably, bipolarity exciting current I can be for example square wave, triangular wave or sinusoidal wave form.
Fig. 1 b has shown that field coil 12,13 does not comprise iron core, that is, they are so-called air core coils.Yet as common in this coil device, field coil 12,13 also can be wrapped on the iron core that is generally soft magnetic bodies, wherein iron core can with the pole piece acting in conjunction; Referring to for example US-A 55 40 103.
Forming electromagnetic action in an illustrated embodiment here preferably realizes like this in the exciting bank of the coil device of medium, and decide the shape and size of two field coils 12,13 especially like this, make within measuring tube 11, the magnetic field H that is produced by two coils is with respect to second diameter symmetry perpendicular to first diameter, particularly rotation symmetry.
In one embodiment of the invention, generate DC current by drive electronics 21, the DC current of regulating particularly with constant amplitude, utilize the switching mechanism of suitable for example H or T type circuit structure periodically to switch this electric current then, thereby and with its modulation, with the alternating current of the amplitude of regulating.So, make exciting current I flowing through coil device by this way, make shown in Fig. 2 a, during the first switch step PH11 with first direction of current flowing through coil 12,13 respectively, and during the second switch step PH12 subsequently with first party flowing through coil 12,13 in the opposite direction; For Current Regulation and polar switching, also referring to US-A 44 10 926 or US-A 60 31 740.
After the second switch step PH12 is the 3rd switch step PH21, and during the 3rd switch step, exciting current I flows on first direction once more.Is the 4th switch step PH22 after the 3rd switch step, during exciting current I flow in the opposite direction once more.After this is corresponding switch step PH31, or the like.About the direction counter-rotating of exciting current I, per two switch steps in succession form returing cycle P1, P2, P3 etc.Come along with the polar switching of the exciting current I of flowing through coil device, except switch step drift possible and its basic synchronization, magnetic field H reversal of poles repeatedly is referring to Fig. 2 a.
In order to produce at least one electric measurement signal corresponding to measuring amount, sensor device also is provided in measuring transducer, it is placed on the measuring tube or at least in its vicinity.According to a preferred embodiment of the invention, sensor device comprises the electrode that is directly installed on basically on the measuring tube.Be installed in first electrode 14 on the tube wall inboard of measuring tube 11 and be used to detect the first electromotive force e by the magnetic field H induction
14Second electrode of settling with the same manner 15 is used to detect the second electromotive force e by magnetic field induction
15Potential electrode 14,15 is positioned on second diameter of measuring tube 11, and this second diameter is perpendicular to the longitudinal axis of first diameter and measuring tube; They can also for example be positioned on the string that is parallel to second diameter of measuring tube 11, referring to US-A 56 46 353.
In Fig. 1 b, potential electrode the 14, the 15th, stream electrical measurement electrode, that is, and the electrode of contacting with fluid.Also can use two capacitance measurement electrodes, that is, for example be assemblied in the electrode of the tube wall inside of measuring tube 11.Each potential electrode 14,15 sense potential e
14, e
15, this electromotive force is to respond in the fluid of measuring tube of flowing through according to faraday's principle in operation.
Shown in Fig. 1 b, in operation, potential electrode 14 and 15 is connected to the noninvert input and the paraphase input of differential amplifier 22 at least off and on.So, form two electromotive force e that detect by potential electrode 14,15
14, e
15Electric potential difference, as measuring-signal u, it is corresponding to the voltage that produces in the fluid that flows, and thereby corresponding to measured physical quantity.The electromotive force e at potential electrode 14,15 places
14, e
15Common scope at about 10～100mV.
Schematically show as Fig. 1 a and 1b, in an illustrated embodiment, be fed to analysis circuit 3 in flowmeter at the measuring-signal u of the output terminal of differential amplifier 22.According to the present invention, analysis circuit 3 is used for measuring-signal u that digitizing presents and especially partly with the first data set DS
1Form store it, thereby in order to determine measured value X
M, the information that the time of relevant a part of measuring-signal u distributes is preserved for use with digital form.
For this reason, in analysis circuit 3, as schematically showing among Fig. 1 a, but measuring-signal u in an illustrated embodiment at first through having the low-pass filter 31 of predetermined order and adjustable cutoff frequency, for example, passive or active RC filter.Low-pass filter 31 is used for measuring-signal u is carried out frequency band limits avoiding aliasing error, thereby and for digitizing this measuring-signal of pre-service.According to known Nyquist theory, cutoff frequency is set to less than 0.5 times of sampling frequency that the conducting composition of measuring-signal u sampled.If measuring-signal u in essential mode by frequency band limits, can not need low-pass filter 31 so.
The output terminal of low-pass filter 31 is coupled to the signal input part of the A/D converter (analog to digital converter) 32 of analysis circuit 3, and this analog to digital converter will be converted to the digital measurement signal u that represents it from the measuring-signal u that low-pass filter 31 receives
DA/D converter 32 can be arbitrary A/D converter that those skilled in the art are familiar with, and for example uses the converter of serial or parallel conversion, and it can be with above-mentioned sampling frequency regularly.Proper A/D transducer type is the delta-sigma A/D converter ADS 1252 of for example Texas Instruments Inc, and it has 24 bit resolutions and smaller or equal to the permission sampling frequency of 40kHz.Be appreciated that the sampling rate less than 10kHz is enough for the method according to this invention.
If provide A/D converter 32 in order only to change positive signal value, for example aforementioned ADS 1252 must correspondingly regulate the reference voltage of A/D converter 32 so like this, makes that the minimum signal value in the input end expectation of converter is provided with measuring-signal u
DAt least one bit, particularly the highest significant bit (MSB).In other words, the DC composition must add the signal that is in low-pass filter 31 output terminals to, makes this signal will be basically act on A/D converter 32 as the DC signal of variable amplitude.
Digital measurement signal u at the output terminal of A/D converter 32
DFor example be written into the volatile data memory 33 of analysis circuit 3 piecemeal by internal data bus, here it is with the form of the set of the measurement data of stored digital, be used as the finite sampling sequence A F of instantaneous representative measuring-signal u and remain valid, calculate machine 34 especially for the digital flow of analysis circuit 3.Data-carrier store 33 can be for example static and/or dynamic read-write memory.
The width of instantaneous sampling window, promptly, the time span of the part of the instantaneous representative measurement data u that will store of sampled sequence AF can for example be positioned at the scope of the total duration of exciting current I timing one of used switching cycle P1, P2, perhaps is positioned at the scope of the duration of one of switch step PH11, PH12, PH21, PH22.Therefore, the clock that is used to read in data-carrier store 33 basically with the clock homophase of exciting current.Clock period commonly used in the universal flow of described type is greatly in the scope of 10～100ms; At the 10kHz of A/D converter 32 sampling frequency f
aThe place, this will provide 100～1000 sampling, i.e. 1000 sampled values that will store of the sampled sequence AF or first data set.
If desired, for example since data-carrier store 33 than low capacity or in order to eliminate the voltage transient that causes owing to reversing magnetic field, can also be only with a part of measuring-signal u rather than the digital measurement signal u of each switch step generation
DRead in data-carrier store 33.For this point is described, each above-mentioned switch step PH11, PH12, PH21, PH22, PH31 are subdivided into the first subcycle T111, T121, T211, T221, the T331 that is used to set up magnetic field, and the relevant second subcycle T112, T122, T212, T222, the T312 that are used as measuring phases; Referring to Fig. 2 a, 2b and 2c.Preferably, in this embodiment of the present invention, only there is the distribution of the measuring-signal u that is associated with each second subcycle T112, T122, T212, T222, T312 to be mapped into data-carrier store 33 virtually, the analysis of measurement data and the generation of measured value wherein take place during each next magnetic field establishment stage T121, T211, T221, T311.
In order to generate measured value X from sampled sequence AF
M, flow computer 34 for example at least temporarily has to data-carrier store 33 and the wherein access of the data set of storage, particularly data read access via internal data bus.Flow computer 34 is preferably realized with the calculation procedure of microprocessor 30 and wherein operation, is schematically shown as Fig. 1 a.
In a preferred embodiment of the invention, analysis circuit 3 also comprises the memory manager 35 that is embodied as independent electronic circuit, and it is for example communicated by letter by internal data bus with microprocessor 30, is used for management data storer 33, is used for control figure measuring-signal u especially
DSampling and the generation of sampled sequence AF, thereby reduce the load of microprocessor 30.Memory manager 35 preferably has programmable logic device (PLD), such as PAL (programmable logic array) or FPGA (field programmable gate array).If desired, memory manager 35 can also be realized by the suitable calculation procedure of microprocessor 30 or another microprocessor (not shown) and wherein operation.Utilize memory manager 35, can also for example on a plurality of sampled sequences, realize for the common equalization of this flow measurement instrument.
As mentioned above because interference potential E112, the E122, E222, the E312 that occur in potential electrode 14,15, measuring-signal u may by serious disturb and thereby impaired; Referring to Fig. 2 b, 2c.For this point is described, Fig. 3 a, 3b have shown the electromotive force e that writes down in about ten seconds
14, e
15Distribution, interference potential superposes thereon sometimes.In Fig. 4 a, 4b, the Potential Distributing e of record
14, e
15The part that is interfered in described mode on another time scale, shown once more; In fact, the Potential Distributing e that shows among Fig. 3 a, the 3b
14, e
15Noiseless zone in Fig. 5 a, 5b, described once more.
For studies show that of distributing of time of this interference potential, can not further infer as Fig. 3 a, 3b, although for example the moment of the amplitude of this interference potential or their generations can be scheduled to, but can suppose typical amplitude distribution for many interference potentials at least, and this amplitude distribution is considered prior imformation in analysis to measure signal u and definite measured value.What make that the inventor is taken aback is, interference potential is reflected as significantly in the time of measuring-signal u distributes, its distribution form can be determined in advance at least qualitatively unusually.In operation, in sampled sequence AF or utilize the real data collection DS therefrom obtain
1, relatively more these are unusual for reliable detection, and they can be eliminated from data centralization, and information loss is very little.
Therefore, in the method according to the invention, by determining the first data set DS in storage
1Within digitally represent unusual data set DS
A, detect to small part since cause in the time of measuring-signal u distributes at the interference voltage of interference potential, particularly pulse shape that potential electrode 14,15 is located one of at least unusual, as schematically showing among Fig. 6 a.In addition, in order to generate the glitch-free second data set DS
2, detect like this unusually by the first data set DS from storage
1In remove, so the non-interference data collection DS that obtains
2Be used for determining measured value X
M, the measured physical quantity of the fluid that its representative is flowed.
In an embodiment of method of the present invention, in order to generate glitch-free data set DS
2, use the digitized measuring-signal u of an a part of measuring-signal u or a part
DDetermine the mean value U of the voltage in the fluid that flows, responded to, and in data-carrier store 33, keep it to be used for further calculating.Have advantage, can use the data set DS of current storage
1And/or use in moment utilization (last switch step of preferably last switch step or same direction of current) during switch step before before and determine mean value U from the data set that measuring-signal u obtains and temporarily preserves.In order to constitute mean value U, preferably, use not belong to and represent abnormal data group DS
AAnd thereby be construed to glitch-free basically data.
So, use mean value U, can be for example by simply from the data set DS of current storage
1In remove the unusual data set DS of representative
AIndividual data and corresponding current mean value U is inserted in data set DS
1" sky " position in, and in simple mode very effectively from data set DS
1The middle elimination disturbed.Yet,, will lose appreciable metrical information by this way in the situation that flow significantly changes.
According to recognizing that the maximum interference electromotive force has comparable basically qualitatively distribution form, and in its time distributes thereby at least, can qualitatively in advance determine or at least can have been estimated preferably, the method according to this invention further develops so, shown in Fig. 6 b, use the 3rd data set DS of the numerical data of the artificial generation that is similar to the distribution of interference voltage time
KForm the glitch-free second data set DS
2, these data are data set DS that analysis circuit 3 uses from the unusual first prelocalization of representative
APartial data at least calculate, and if necessary, be temporarily stored in data-carrier store 33.
Can have advantage ground now and generate the glitch-free second data set DS like this
2: at first from the 3rd data set DS
KWith the unusual data set DS of representative
ASelect data value x separately, wherein the data value x of two selections has corresponding particularly identical time value I; And the data value x's of two instantaneous selections of numerical value ground formation is poor.Repetition is until having used all from the unusual data set DS of representative
AData value x.By this way, from measuring-signal u, deduct with its distribution form interference potential of being similar to of height and duration particularly with Virtualization Mode.So, suppose that the voltage above the interference potential APPROXIMATE DISTRIBUTION is interested actual measurement voltage basically, in fact measuring-signal only has the part corresponding to physical quantity to be retained in glitch-free data set DS
2In.
In order to generate artificial data collection DS
K, further developing according to of the present invention, analysis circuit 3 is in operation for from the unusual data set DS of representative
ADetermine at least one penalty function to the small part numerical data, and use this penalty function to determine artificial data collection DS
KIn an embodiment of this development of method of the present invention,, use from the unusual data set DS of representative in order to determine at least one penalty function
AData value x, determine at least one of at least one penalty function, preferred two or more coefficient T
1
In order to determine the coefficient T of penalty function, particularly penalty function
1, for example can be programmed in the analysis circuit 3 and be applied to current data set DS available in data-carrier store 33 based on the minimum variance algorithm of Gauss principle
A
Current mean value U is only arranged as replacing with top from the unusual data set DS of representative
AThe embodiment of data compare, use suitable penalty function, particularly use the glitch-free data set DS that generates like this for flow measurement
2, measuring error can be reduced by at least half and also thereby significantly reduce.
Research for various application shows, the common especially distribution form of the interference potential of described type is very similar with for example short needle-like potential pulse.Interference potential has precipitous relatively rising edge usually, follows thereafter to be the negative edge of index substantially.According to this point, in another embodiment of aforementioned advances of the present invention,, at least one coefficient is defined as the time constant of the penalty function (for example single order or more the decline e function of high-order) of index decreased in order to determine at least one penalty function.
In another embodiment of the present invention, for example by for from the unusual data set DS of representative
ADifferent pieces of information to repetitive sequence application of aforementioned calculation procedure, at first generate the interim coefficient of penalty function, particularly interim coefficient sequence.According to further developing, for example after having calculated each interim coefficient or after just having calculated whole coefficient sequence, the interim coefficient that digital filtering is determined.Studies show that, if particularly recursive digital filter is used for coefficient sequence, even the measurement result that also can obtain then with lower order filter, even the result of robust and in interference potential, exist wide spectrum also can accurately reproduce this result particularly.In a preferred embodiment, can determine interim coefficient sequence according to following calculation procedure:
Wherein
The interim coefficient of-penalty function calculates in the calculation procedure of current execution,
T
n-the intermediate value determined in advance for current calculation procedure and
λ, (1-λ)-for the definite in advance filter coefficient of digital filter, 0＜λ＜1.
In data-carrier store 33, can store the interim coefficient of determining separately and also can only store corresponding current and previous coefficient.Use calculation procedure and carried out predetermined computation cycles number of times, for example equal to represent unusual data set DS until
AIn the data number, and/or the interruption criterion of before having satisfied, having selected, for example the change between the interim coefficient that in the end calculates is enough little.So coefficient T that the last compensating coefficient function that calculates is looked for
1
If the time durations that prolongs and thereby interference potential appears between potential electrode in a plurality of measuring phases, use the corresponding coefficient design factor of in last measuring phases, determining so; This coefficient early can be used for for example current interim coefficient T
N-1
In another embodiment of method of the present invention, use the instantaneous definite mean value U of voltage that responds to in the fluid that flows, produce the coefficient of at least one penalty function or penalty function.This has advantage ground and has been undertaken by numerical value when determining the intermediate value of interim coefficient according to following calculation procedure:
Wherein
x
I1, x
I2-from the unusual data set DS of representative
AFirst and second data values, and i
1, i
2-subscript is corresponding to each autocorrelative time value.
Use among the embodiment of method of equation (2) at this, be formed on from the unusual data set DS of representative
AThe first data value x
I1And first poor between the instantaneous definite mean value U of the voltage of in the fluid that flows, responding to, be formed on from representing unusual data set DS
AThe second data value x
I2And second poor between the instantaneous definite mean value U of the voltage of in the fluid that flows, responding to.From the merchant that first and second differences are determined, natural logarithm is determined on numerical value ground, then according to its data value x with current use
I1, x
I2Time value or subscript i
1, i
2Between the previous poor regularization that forms.
Unusual in order to detect, in another embodiment of the present invention, utilize the first data set DS
1Determine to represent the interference voltage very first time value t of the zero hour
sFor this reason, can be with the first data set DS
1Numerical data for example with the first threshold TH that can be scheduled to
s, particularly in operation variable threshold ratio, to generate first fiducial value, it has surpassed first threshold TH with signal indication
sVery first time value t
sCan be from t
s=i
s/ f
aCalculate, wherein i
sIt is the subscript that is defined as surpassing first first data value of threshold value.In addition, in order to utilize the first data set DS
1Detect unusually, for example based on t
e=i
e/ f
aDetermine the second time value t
e, the moment that on behalf of interference voltage, it finish.In a similar fashion, can be with the first data set DS
1The numerical data and the second threshold value TH that for example can be scheduled to
e, particularly in operation variable threshold ratio, to generate second fiducial value, this second fiducial value is lower than the second threshold value TH with signal indication
eAbout this point, should be noted that the aforementioned absolute value that more in fact relates to measuring-signal u.If these relatively will consider the symbol of measuring-signal u, so for the threshold value TH of negative voltage
s, TH
eMust fixing corresponding negative value.
According to supposition, because physics or technical reason, for example two measuring phases T112 and flows between the T122 in succession only may change relatively little degree, in a preferred embodiment of the invention, and at least one threshold value TH
s, TH
eBe determined in operation and adapt to the current fluid that in measuring tube 11, flows, particularly adapt to the determined flow measurements of switch step for early.Have advantage ground, before the priority of use, the intermediate value U of the measuring-signal u that determines in the particularly last or undisturbed measuring phases the earliest can for example form threshold value TH
sOr TH
eIn simple especially mode, the value that can be for example increases by the maximum that during operation threshold value is increased corresponding to the measuring-signal u that expects within elapsed time perhaps by threshold value is increased corresponding percentage, and realizes this point.
In another embodiment of method of the present invention, by according to the first data set DS
1Determine at least one amplitude and the 3rd time value that is associated and detect unusual, but wherein the amplitude representative preset time at interval within the amplitude of measuring-signal, particularly maximum absolute amplitude.In addition, unusual in order to detect, make the first data set DS
1Some or all data, perhaps only about the data of amplitude and the 3rd threshold value TH that can be scheduled to
a, particularly variable in operation threshold ratio.Select this threshold ratio first threshold TH
sGreatly, and its representative be detected as the predetermined minimum radius of unusual voltage.In addition, generate corresponding the 3rd fiducial value, it has surpassed threshold value TH with signal indication
a
In another embodiment of the present invention, by with the first data set DS
1The numerical data and the 3rd threshold value TH that can be scheduled to
aRelatively, and generate the 3rd fiducial value in the corresponding way, and detect unusually, wherein the 3rd fiducial value has surpassed threshold value TH with signal indication
a
In another embodiment of the present invention, unusual in order to detect, the very first time value t that begins of the representative interference voltage of Que Dinging formerly
sWith the second time value t that represents interference voltage to finish
eBetween formation time difference t
e-t
s, to determine the 4th time value, the duration that on behalf of interference voltage, it take place.Then this 4th time value once more with corresponding the 4th threshold ratio, the representative of this threshold value is for the minimum duration be scheduled to of the unusual potential pulse that is construed to eliminate.
Further, at the first data set DS
1Do not have to be worth the very first time value t that determines less than previous service time in the disturbed fully situation
sData set DS
1The digital measurement data and/or service time value greater than the second time value t
eData set DS
1The digital measurement data, calculate the mean value U of the voltage of in the fluid that flows, responding to.
Except above-mentioned penalty function, in operation can also be for from the unusual data set DS of representative
AThe numerical data of second portion at least determine another penalty function, for example for the simple rising straight line of the rising edge of disturb voltage pulses, and can be also by using this second penalty function to generate artificial data collection DS
KData.
Generating glitch-free data set DS
2Afterwards, can utilize analysis circuit 3,,, for the mode of flow measurements explanation, calculate the measured value of representing measured physical quantity among US-A 44 22 337 or the US-A 47 04 908 for example with US-A 43 82 387 in common mode.As mentioned above, the amplitude distribution of determining to depend on instantaneous delivery of flow for example based on the voltage between two potential electrode 14,15, it can utilize the non-interference data collection DS that preserves in the data-carrier store 33 now
2And determine with the existing mode high precision.Current non-interference data collection DS
2Or the data set of some this storages also can be used for determining other interested physical quantity, for example the viscosity of fluid, indication, turbulent extent etc. flow.
About this point, should be noted that replacement generates analog difference signal for the single differential amplifier of potential electrode 14,15 uses, certainly provides corresponding independent signal amplifier for each potential electrode 14,15.Correspondingly, also can for example utilize two digitized measuring-signals digitally to calculate two electromotive force e that obtain from potential electrode 14,15
14, e
15Electric potential difference.
Use data set DS
1Generate non-interference data collection DS
2With utilize non-interference data collection DS
2Determine measured value X
MThe method of required analysis can realize in a manner familiar to those skilled in the art, for example as the computer program that moves in the microprocessor 30.The program code that needs can be implemented in the writable memory 36 of analysis circuit 3, and particularly permanent memory for example is embodied as EPROM, EEPROM or flash EEPROM, and microprocessor 30 is during operation from reading of data wherein.
In a preferred embodiment, microprocessor 30 realizes by means of digital signal processor, Texas Instruments for example, TMS 320 C 33 types of Inc.In control module 3, if desired, except microprocessor 30 can also provide for example extra signal processor.
Flowmeter can for example be connected to the fieldbus (not shown), thereby and is connected to remote control room and via the external power source of in-line power unit 4 to the flowmeter feed.In order to measure transmission instrumented data, particularly flow measurements on the bus at the scene, flowmeter also comprises the communication unit 5 with suitable data interface 51.In addition, communication unit 5 can comprise corresponding demonstration and control module 52, especially for the Field adjustment of visual instrumented data and/or permission flowmeter.
An advantage of the present invention is, by using the current first data set DS
1Particularly need not to be used for the high-order digit wave filter of the sampled sequence AF or first data set and need not under the situation of frequency domain for the analysis of spectrum of the complexity of the sampled sequence AF or first data set, even the data set that uses is interfered in whole or in part, also can after the relatively short time, determine measured value.This in addition can realize in two or more measuring phases, having the interference of measuring-signal u.In addition, except needs considerably less computing time, the method according to this invention is compared with the digital filter of corresponding high-order, provides higher selectivity for the interference of described kind.Especially, for above-mentioned second kind of interference potential or at highly viscous liquid, for example in the situation of paper pulp, can obtain extraordinary result.Another advantage of the present invention is that this method can use existing flow transmitter and existing function circuit to realize.If revise suitably and realize software, even can use existing analysis circuit.Another advantage of the present invention is, outside the Process meter that it also can be used for here showing as embodiment.For example, the present invention can have the flowmeter that advantage ground is used to utilize sonac or utilizes the measuring tube work of vibrating during operation especially.
Although in accompanying drawing and above stated specification, describe the present invention in detail; it is exemplary and not as the qualification for feature that these explanations should be counted as; be to be understood that; only show and exemplary embodiment has been described, and drop on all changes within the spirit and scope of the present invention described herein and revise and all should be protected.
Claims (24)
1. be used for the particularly method of magnetic induction flowmeter of operating process measurement instrument, this Process meter has measuring tube (11), and this measuring tube inserts the pipeline that particularly mobile medium is flowed through, and this method may further comprise the steps:
-make MEDIA FLOW through measuring tube (11);
The flow through function circuit (21) of flowmeter of the particularly ambipolar exciting current of-order (I), to drive exciting bank (12,13), this exciting bank is arranged in the medium that measuring tube (11) is gone up and acted on measuring tube and/or wherein flow through;
-utilize the sensor device (14,15) that is arranged on the measuring tube (11), produce at least one electric measurement signal (u) corresponding to the physical measurement amount;
-digitized measurement signal (u) or its part at least are to generate the digital sampling sequence (AF) of the time distribution of represent measuring-signal (u);
-storage at least a portion digital sampling sequence (AF) is to generate the first data set (DS
1), but on behalf of the time of measuring-signal (u) within the preset time interval, it distribute instantaneously;
-by detecting the first data set (DS in storage
1) within digitally represent unusual data set (DS
A), detecting measuring-signal time unusual in distributing, it causes to the interference potential (E222) of small part owing to the particularly pulse shape that comprises in measuring-signal;
-belong to described data set (DS from first data centralization extraction of storage
A) data, to generate the glitch-free second data set (DS
2); With
The described second data set (DS of-use
2), the measured value (X of the physical quantity of the fluid that definite representative is flowed
M).
2. method according to claim 1, the wherein second data set (DS
2) also comprise at first at the first data set (DS
1) in the digital measurement data that comprise.
3. method according to claim 1 and 2 wherein detects unusual step and comprises according to the first data set (DS
1) determine very first time value (t
s) step, this time value (t
s) representative is corresponding to zero hour of the interference voltage of interference potential (E222).
4. method according to claim 3 is wherein determined very first time value (t
s) step comprise the first data set (DS
1) the numerical data and the first threshold (TH that can be scheduled to
s) relatively and generate the step of first fiducial value, wherein first fiducial value surpasses first threshold (TH with signal indication
s).
5. according to the described method of one of aforementioned claim, wherein detect unusual step and comprise according to the first data set (DS
1) determine the second time value (t
e) step, this time value (t
e) represent finish time of interference voltage.
6. method according to claim 5 is wherein determined the second time value (t
e) step comprise the first data set (DS
1) the numerical data and the second threshold value (TH that can be scheduled to
e) relatively and generate the step of second fiducial value, wherein second fiducial value is lower than the second threshold value (TH with signal indication
e).
7. according to the described method of one of aforementioned claim, wherein detect unusual step and comprise according to the first data set (DS
1) determine the step of amplitude, but this amplitude representative preset time at interval within the amplitude of measuring-signal (u), particularly maximum absolute amplitude.
8. method according to claim 7, wherein detect unusual step and comprise the step of determining the 3rd time value according to first data set, but the amplitude of this time value representative measuring-signal within the preset time interval, the moment that particularly maximum absolute amplitude takes place.
9. method according to claim 6 wherein detects unusual step and comprises amplitude and the 3rd particularly variable during operation threshold value (TH that can be scheduled to
a) relatively and generate the step of the 3rd fiducial value, the 3rd fiducial value surpasses the 3rd threshold value (TH with signal indication
a).
10. according to claim 2 or 4 described methods, wherein detect unusual step and comprise the formation first and second time value (t
s, t
e) between mistiming (t
s-t
e) step, the 4th time value of the duration of interference voltage appears to determine representative.
11., wherein generate the glitch-free second data set (DS according to the described method of aforementioned arbitrary claim
2) step comprise that the particularly digitized measuring-signal of use (u) determines the step of the mean value (U) of the voltage of inducting in the fluid that flows.
12., wherein generate the glitch-free second data set (DS according to the described method of aforementioned arbitrary claim
2) step comprise and use the first data set (DS
1) numerical data determine the step of the mean value (U) of the voltage of in the fluid that flows, inducting.
13. according to the described method of aforementioned arbitrary claim, the step that wherein generates glitch-free second data set comprises that use is from the unusual data set (DS of representative
A) partial data at least generate artificial the 3rd data set (DS
K) numerical data, the time of the approximate interference voltage of the 3rd data set distributes.
14. method according to claim 13 wherein generates artificial the 3rd data set (DS
K) step comprise for from the unusual data set (DS of representative
A) at least a portion numerical data determine the step of at least one penalty function.
15., wherein generate artificial the 3rd data set (DS according to claim 12 or 13 described methods
K) step comprise that use is from the unusual data set (DS of representative
A) data value and penalty function that use the to determine step that generates numerical data.
16., wherein generate the second data set (DS according to the described method of one of claim 12 to 14
2) step comprise and be formed on the unusual data set (DS of representative
A) a data value and artificial the 3rd data set (DS
K) a data value between the step of difference, wherein these two are used to form poor data value and have corresponding particularly identical time value.
17. according to the described method of one of claim 13 to 15, the step that wherein generates at least one penalty function comprises that use is from the unusual data set (DS of representative
A) data value determine at least one coefficient (T of penalty function
1) step of time constant particularly.
18. according to the described method of one of claim 13 to 16, the step that wherein generates at least one penalty function comprises that use determines the coefficient (T of penalty function for the instantaneous definite mean value (U) of voltage of inducting in the fluid that flows
1) step of time constant particularly.
19. method according to claim 18, the wherein coefficient (T of definite penalty function
1) step may further comprise the steps:
-be formed on from the unusual data set (DS of representative
A) first data value and first poor between the instantaneous definite mean value (U) of the voltage of in the fluid that flows, inducting,
-be formed on from the unusual data set (DS of representative
A) second data value and second poor between the instantaneous definite mean value (U) of the voltage of in the fluid that flows, inducting, and
The merchant of-formation first difference and second difference.
20., determine that wherein the step of the coefficient of penalty function may further comprise the steps according to the described method of one of claim 12 to 18:
Numerical coefficient sequence (the T of the interim coefficient of-generation penalty function
n), and
-filtering figure sequence (T recursively particularly digitally
n).
21., wherein generate the 3rd data set (DS according to the described method of one of claim 12 to 19
K) step comprise for from the unusual data set (DS of representative
A) the numerical data of second portion at least determine the step of at least one second penalty function.
22. according to the described method of aforementioned arbitrary claim, wherein exciting bank (12,13) comprises the coil device that is used for excitation field (H), the medium that guides is also cut in this magnetic field especially in measuring tube.
23. method according to claim 22, wherein sensor device (14,15) comprises the potential electrode that is arranged on the measuring tube (11), and this method is further comprising the steps of:
-utilize exciting bank (12,13) to produce the magnetic field (H) of also cutting the medium of guiding in measuring tube (11);
-induced potential in the fluid that flows is used to change the electromotive force (e that is applied to potential electrode
14, e
15); With
-carrying-off is applied to the electromotive force (e of potential electrode
14, e
15), be used to produce at least one measuring-signal (u).
24. be used for magnetic induction flowmeter at the mobile fluid of pipeline, particularly be applicable to enforcement according to the described method of one of claim 1 to 20, it comprises:
-insert the measuring tube (11) of pipeline, be used to guide fluid;
-analyze and function circuit (2,3);
-by the device of analyzing and function circuit (2,3) is presented, being used for producing the magnetic field of cutting measuring tube (11), this device comprises the coil device (12,13) that is installed on the measuring tube (11) and is energized electric current (I) process
-at least two potential electrode (14,15) are used for detecting the electromotive force (e flowing through measuring tube and being inducted by the fluid of magnetic field intercepts
14, e
15);
-be connected to the device of potential electrode (14,15) at least off and on, be used to generate electromotive force (e by detecting
14, e
15) at least one measuring-signal (u) of providing; With
-be used to store the first data set (DS
1) device, but this first data set represent instantaneously preset time at interval in the time distribution of measuring-signal (u);
-wherein analyze and function circuit (2,3)
--according to the first data set (DS
1) detecting unusual in measuring-signal (u), it is because the interference potential that occurs at least one potential electrode (14,15) causes;
--from the first data set (DS of storage
1) in remove the unusual of detection, and generate the second unusual data set (DS that does not detect
2); With
--utilize and remove the unusual noiseless second data set (DS
2), generate at least one measured value (X
M), the physical quantity of the fluid that its representative is flowed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10329540.2 | 2003-06-30 | ||
| DE2003129540 DE10329540A1 (en) | 2003-06-30 | 2003-06-30 | Method for operating a magneto-inductive flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN1816734A true CN1816734A (en) | 2006-08-09 |
Family
ID=33546776
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480018821 Pending CN1816734A (en) | 2003-06-30 | 2004-06-17 | Method for operating a process-measuring device |
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| Country | Link |
|---|---|
| EP (1) | EP1639324A1 (en) |
| JP (1) | JP2007506938A (en) |
| CN (1) | CN1816734A (en) |
| DE (1) | DE10329540A1 (en) |
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| US7353119B2 (en) * | 2006-03-14 | 2008-04-01 | Rosemount Inc. | Reduced noise sensitivity in magnetic flowmeter |
| DE102007055556A1 (en) * | 2007-11-20 | 2009-05-28 | Krohne Meßtechnik GmbH & Co KG | Device for data recording for a measuring device and measuring system |
| DE102008016296A1 (en) * | 2008-03-28 | 2009-10-01 | Endress + Hauser Process Solutions Ag | Flowing medium amount determining method for use in filling system in industrial area, involves determining correction value based on discrete measuring signal differences, and correcting amount detected from measured flow rate by value |
| DE102008051034A1 (en) | 2008-10-13 | 2010-04-15 | Endress + Hauser Flowtec Ag | Method for energy-saving operation of a magneto-inductive flowmeter |
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| DE102010003948A1 (en) * | 2010-04-14 | 2011-10-20 | Endress + Hauser Flowtec Ag | Method for processing a time-discrete, one-dimensional measurement signal |
| DE102013106050A1 (en) * | 2013-06-11 | 2014-12-11 | Gerd Stange | Fluid flow rate measuring device and method |
| DE102022115308B3 (en) | 2022-06-20 | 2023-11-09 | Krohne Ag | Method for determining a flow of a medium with a magnetic-inductive flow measuring device, method for operating a filling system with a magnetic-inductive flow measuring device, magnetic-inductive flow measuring device and filling system with a magnetic-inductive flow measuring device |
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| JPS604811A (en) * | 1983-06-23 | 1985-01-11 | Yokogawa Hokushin Electric Corp | Electromagnetic flowmeter |
| JPS6184107A (en) * | 1984-10-02 | 1986-04-28 | Yamatake Honeywell Co Ltd | Signal processing system |
| US5339335A (en) * | 1992-12-15 | 1994-08-16 | Elsag International B.V. | Method and apparatus for digitally processing and filtering signals in industrial control applications |
| JP3020772B2 (en) * | 1993-07-09 | 2000-03-15 | 株式会社東芝 | Electromagnetic flow meter |
| US6220103B1 (en) * | 1996-07-15 | 2001-04-24 | Engineering Measurements Company | Vortex detector and flow meter |
| US6308694B1 (en) * | 1999-01-11 | 2001-10-30 | Ford Global Technologies, Inc. | Flow measurement and control |
| US6505517B1 (en) * | 1999-07-23 | 2003-01-14 | Rosemount Inc. | High accuracy signal processing for magnetic flowmeter |
| GB2371869B (en) * | 2001-01-31 | 2005-10-05 | Abb Automation Ltd | Flowmeter fault detection |
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- 2004-06-17 RU RU2006102492/28A patent/RU2335740C2/en not_active IP Right Cessation
- 2004-06-17 WO PCT/EP2004/006510 patent/WO2005001395A1/en active Application Filing
- 2004-06-17 EP EP04739970A patent/EP1639324A1/en not_active Withdrawn
- 2004-06-17 CN CN 200480018821 patent/CN1816734A/en active Pending
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| CN101680790B (en) * | 2007-03-07 | 2013-08-21 | 齐伦投资专利Ii两合公司 | Method for measuring the flow velocity of a medium while applying a magnetic field to the measurement volume put through |
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| CN103048250B (en) * | 2011-10-17 | 2016-06-29 | 恩德莱斯和豪瑟尔测量及调节技术分析仪表两合公司 | The method identified and/or assess the interference measuring signal |
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| CN104949722B (en) * | 2014-03-24 | 2020-10-09 | 克洛纳测量技术有限公司 | Magnetic-inductive flow meter and method for operating a magnetic-inductive flow meter |
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| CN106643931A (en) * | 2016-09-23 | 2017-05-10 | 三川智慧科技股份有限公司 | Ultrasonic flow measuring method and device |
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| CN111406200A (en) * | 2017-12-14 | 2020-07-10 | 恩德斯+豪斯流量技术股份有限公司 | Method for operating a magneto-inductive flow meter and magneto-inductive flow meter |
| CN111406200B (en) * | 2017-12-14 | 2021-12-21 | 恩德斯+豪斯流量技术股份有限公司 | Method for operating a magneto-inductive flow meter and magneto-inductive flow meter |
| US11313708B2 (en) | 2017-12-14 | 2022-04-26 | Endress+Hauser Flowtec Ag | Method for operating a magnetic inductive flowmeter and magnetic inductive flowmeter |
| CN112055807A (en) * | 2018-05-02 | 2020-12-08 | 恩德斯+豪斯流量技术股份有限公司 | Measuring system and method for measuring a measurement variable of a flowing fluid |
| CN112055807B (en) * | 2018-05-02 | 2023-10-10 | 恩德斯+豪斯流量技术股份有限公司 | Measuring system and method for measuring a measured variable of a flowing fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1639324A1 (en) | 2006-03-29 |
| DE10329540A1 (en) | 2005-02-24 |
| WO2005001395A1 (en) | 2005-01-06 |
| RU2006102492A (en) | 2007-08-20 |
| RU2335740C2 (en) | 2008-10-10 |
| JP2007506938A (en) | 2007-03-22 |
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