CN109029230B - Contact type displacement sensor measuring device and measuring circuit - Google Patents
Contact type displacement sensor measuring device and measuring circuit Download PDFInfo
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- CN109029230B CN109029230B CN201810643747.7A CN201810643747A CN109029230B CN 109029230 B CN109029230 B CN 109029230B CN 201810643747 A CN201810643747 A CN 201810643747A CN 109029230 B CN109029230 B CN 109029230B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 54
- 238000005259 measurement Methods 0.000 claims abstract description 40
- 239000000523 sample Substances 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 22
- 239000011540 sensing material Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910021389 graphene Inorganic materials 0.000 claims description 5
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- 241001422033 Thestylus Species 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- -1 polydimethylsiloxane Polymers 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 4
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- 230000005540 biological transmission Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
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- 238000012805 post-processing Methods 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The invention discloses a contact type displacement sensor measuring device. The method comprises the following steps: the measuring part comprises a shell, and a connecting part at the top of the shell is detachably connected with the data conversion part; the connecting part is provided with a supporting arm which extends to the bottom of the shell; the sensor in the shell is electrically connected with the data conversion part; the first end of the sensor is fixed on the measuring pen, and the second end lower than the first end is fixed on the supporting arm; the tail end of the measuring pen which can move up and down in the shell is provided with a probe extending out of the bottom end face of the shell, the probe and the measured body move relatively to push the measuring pen to move upwards, the first end is far away from the second end to generate strain, and the data conversion part finishes measurement. The invention also discloses a measuring circuit of the contact type displacement sensor. The invention adopts the adaptive detachable structure to carry out measurement based on the flexible strain sensor, thereby improving the flexibility of the system, the sensitivity of the original signal and the measurement accuracy; the circuit complexity is reduced; has the advantages of simple structure and quick measurement.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a measuring device and a measuring circuit of a contact type displacement sensor.
Background
The contact type displacement sensor measuring device is a commonly used size measuring sensor in the industry, is often used together with equipment such as a three-coordinate measuring instrument and the like, and is essential measuring equipment in modern production. The traditional contact type displacement sensor measuring device usually adopts the technical schemes of mechanical type, differential transformer type, grating ruler and the like for measurement.
For example, chinese patent document CN1108384A discloses a "contact type displacement sensor measuring device for profile measurement", and chinese patent document CN107003118A discloses a "displacement sensor, a displacement detecting device, and a displacement detecting method", in which displacement is measured by using a grating ruler, the displacement is converted into a light intensity signal, and further converted into an electrical signal for reading. The above patents have problems that: the structure is complex, and a complex light path is arranged inside the structure; the signal acquisition difficulty is high, and the post-processing circuit is complicated.
For example, chinese patent document CN107255439A discloses "a method for exciting and demodulating signal of linear displacement sensor", specifically discloses that a differential transformer is used for measuring, the displacement is converted into an inductance signal, and an ac excitation source is further used for reading out the inductance. The patent has the problems that: high signal processing difficulty, high system complexity and the like.
Disclosure of Invention
Based on the above problems, the present invention provides a contact displacement sensor measuring device, which is based on a flexible strain sensor, and adopts a detachable mounting structure adapted to the flexible strain sensor to perform measurement, thereby improving system flexibility, sensitivity of original signals, and measurement accuracy; the circuit complexity is reduced; and the measuring device has the advantages of simple structure, convenient replacement and high measuring speed.
Another object of the present invention is to provide a measuring circuit of the above-mentioned contact type displacement sensor measuring device.
The above purpose is realized by the following technical scheme:
according to one aspect of the present invention, there is provided a contact displacement sensor measuring device comprising: a measurement section and a data conversion section, the measurement section including: the measuring pen is arranged in the shell and can move up and down, a probe is arranged at the tail end of the measuring pen, and the probe extends out of the shell from the bottom end face of the shell; the connecting part is also provided with a supporting arm, and the supporting arm extends towards the bottom in the shell; the sensor is a flexible strain sensor, a first end is fixedly connected to the measuring pen, a second end is fixedly connected to the supporting arm, and the first end is higher than the second end; when the probe contacts the surface of the measured body and moves relative to the measured body, the probe is jacked up to push the measuring pen to move upwards to drive the first end of the sensor to move upwards, the first end of the sensor is far away from the second end, the sensor stretches to generate strain and is converted into a signal to be transmitted to the data conversion part, and measurement is completed through the data conversion part.
Preferably, the end face of the connecting part is provided with a hole, and the top end of the measuring pen extends into the connecting part from the hole. The setting in hole has restricted the position of measuring pen and has made the measuring pen can only reciprocate downtheholely vertically, has avoided the measuring pen to rock in the inside horizontal direction of casing and has influenced measuring result.
More preferably, the housing further comprises an elastic element for limiting the moving stroke of the measuring pen and for rebounding the measuring pen. Further, the elastic element is sleeved on the measuring pen, the elastic element is located between the first end of the sensor and the lower end face of the connecting portion, the measuring pen moves upwards, the elastic element is compressed towards the lower end face of the connecting portion, the sensor is stretched, and after measurement, the elastic element rebounds downwards to reset the measuring pen. The arrangement of the elastic element limits the maximum moving range of the measuring pen, and the measuring pen can be rebounded to the original position after measurement, so that the automation of the measuring device is realized to a greater extent.
More preferably, the measuring pen is connected with a first fixing piece in a buckling mode, the supporting arm is connected with a second fixing piece in a buckling mode, and the first end and the second end of the sensor are fixed to the end faces of the first fixing piece and the second fixing piece respectively. The sensor is more convenient and faster to replace by adopting a mode of connecting the first fixing piece, the second fixing piece and the buckle; and the first fixing piece can also be used as a stop piece of the elastic element.
Preferably, the sensor is a graphene flexible strain sensor, the sensor comprising: the sensor comprises a substrate and a sensing material, wherein the substrate is made of polydimethylsiloxane, and the sensing material is made of a graphene material with a grid structure. More preferably, conductive glue and wires are used to connect to the lower contact pad.
Preferably, a lower contact plate is further arranged in the connecting portion, the sensor is electrically connected with the lower contact plate, and the lower contact plate is electrically connected with the data conversion portion. The electric connection mode is a detachable connection mode, so that the replacement of a sensor, a data conversion part and the like is facilitated, and the flexibility of the system is improved. More preferably, the sensor lead-out wire is connected with the lower contact plate through a female socket, and the lower contact plate is connected with the data conversion part through a pogo pin.
More preferably, one end of the connection part is installed at the top of the housing through a first screwing structure, and the other end of the connection part is connected with the data conversion part through a second screwing structure.
More preferably, the contact type displacement sensor measuring device is in the shape of a pen, the pen point is a probe, the pen point is a measuring part, and the pen tail is a data conversion part. The pen-shaped measuring device makes the invention simpler in structure and more convenient in operation.
According to another aspect of the present invention, there is provided a contact displacement sensor measurement circuit comprising: the measuring unit to and the sampling circuit unit who is connected with the measuring unit, wherein, the measuring unit includes: the flexible strain sensor is connected with the lower contact plate; the sampling circuit unit includes: the device comprises an upper contact plate connected with the lower contact plate, an analog-to-digital conversion circuit board connected with the upper contact plate, and a main control power supply board connected with the analog-to-digital conversion circuit board, wherein the main control power supply board is connected with an upper computer through a power supply interface; the flexible strain sensor converts tensile strain into an analog signal, the analog signal is transmitted to the analog-digital conversion circuit board through the lower contact plate and the upper contact plate, and a current digital-analog converter in the analog-digital conversion circuit board measures voltages at two ends of the sensor, transmits the voltages to the main control board and the power supply board, and outputs the voltages through the power supply interface. The measuring unit adopts the flexible strain sensor to measure the displacement, so that the sensitivity of an original signal is improved, the requirement on a sampling circuit unit is reduced, and the sampling circuit unit has the advantages of simple structure, high circuit complexity, high measuring speed and high accuracy.
Has the advantages that:
the flexible strain sensor-based rapid measurement system adopts the rapid detachable mounting structure matched with the flexible strain sensor for measurement, so that the flexibility of the system, the sensitivity of an original signal and the measurement accuracy are improved; the circuit complexity is reduced; and the measuring device has the advantages of simple structure, convenient replacement and high measuring speed.
The invention adopts a multi-section detachable mounting structure with independent measuring part and data conversion part, which can quickly replace the sensor and the sampling circuit, and simultaneously, the sampling circuit can be reused in other devices, thus improving the flexibility of the system; the displacement is measured by adopting the technologies of a high-precision analog-to-digital conversion circuit board and the like, the sensitivity of an original signal is improved, the complexity of a sampling circuit is reduced, and the measurement accuracy is high.
Drawings
FIG. 1 is a schematic view of the overall structure of a contact type displacement sensor measuring device according to the present invention;
FIG. 2 is a schematic view of a measuring section in a preferred embodiment of the measuring apparatus of the present invention;
FIG. 3 is a schematic diagram of a data conversion unit in a preferred embodiment of the measuring apparatus of the present invention;
FIG. 4 is a schematic diagram of the circuit design of the contact displacement sensor measurement circuit of the present invention;
fig. 5 is a schematic diagram of the program operation of the contact displacement sensor measuring circuit of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention:
fig. 1 schematically shows an external overall structure of a contact displacement sensor measuring device; FIG. 2 schematically shows the internal structure of a measuring part in a preferred embodiment of the measuring apparatus; FIG. 3 schematically shows the structure of a data conversion section in a preferred embodiment of the measuring apparatus; FIG. 4 schematically shows a block circuit design of a contact displacement sensor measurement circuit; fig. 5 schematically shows a program operation block diagram of a contact displacement sensor measurement circuit.
As shown in fig. 1 and 2, the present invention provides a contact type displacement sensor measuring device, including: a measurement unit 100 and a data conversion unit 200, the measurement unit 100 including: the measuring instrument comprises a shell 120, a connecting part 110 detachably mounted at the top of the shell 120, and a measuring pen 133 and a sensor which are positioned in the shell 120, wherein the measuring part 100 is detachably connected with a data conversion part 200 through the connecting part 110, the sensor is electrically connected with the data conversion part 200, the measuring pen 133 can move up and down in the shell 120, the tail end of the measuring pen 133 is provided with a probe 134, and the probe 134 extends out of the shell 120 from the bottom end face of the shell 120; the connecting portion 110 is further provided with a supporting arm 111, and the supporting arm 111 extends towards the bottom inside the housing 120; the sensor is a flexible strain sensor, a first end of the sensor is fixedly connected to the measuring pen 133, a second end of the sensor is fixedly connected to the supporting arm 111, and the first end is higher than the second end; when the probe 134 contacts the surface of the object to be measured and moves relative to the surface, the probe 134 is jacked up to push the measuring pen 133 to move upwards to drive the first end of the sensor to move upwards, the first end of the sensor is far away from the second end, the sensor stretches to generate strain and is converted into a signal to be transmitted to the data conversion part 200, and the measurement and the output are completed through the data conversion part 200. As shown in FIG. 1, the contact type displacement sensor measuring device of the present invention is in the shape of a pen, the pen point is a probe 134, the pen point is a measuring part 100, and the pen tail is a data converting part 200.
In an optional embodiment, a hole is formed in an end surface of the connecting portion 110, a top end of the measuring pen 133 extends into the connecting portion 110 from the hole, and the position of the measuring pen 133 is limited by the hole, so that the measuring pen 133 can only vertically move in the hole, and the measuring pen 133 is prevented from shaking in a horizontal direction inside the housing 120 to affect a measuring result.
In an alternative embodiment, the housing 120 further includes an elastic element therein for limiting the moving stroke of the measuring pen 133 and for rebounding the measuring pen 133. Further, the elastic member is sleeved on the measuring pen 133, the elastic member is located between the first end of the sensor and the lower end surface of the connecting portion 110, the measuring pen 133 moves upwards, the elastic member compresses towards the lower end surface of the connecting portion 110, the sensor is stretched, and after measurement, the elastic member rebounds downwards to reset the measuring pen 133. In this embodiment, the elastic element is a spring, and the diameter of the elastic element is larger than the aperture of the hole. The arrangement of the elastic element limits the maximum moving range of the measuring pen 133, and the measuring pen 133 can be rebounded to the original position after measurement, so that the automation of the measuring device is realized to a greater extent.
In the invention, the second end of the sensor is fixedly connected to the supporting arm 111, so that the second end of the sensor is more conveniently fixed, and the sensor is more conveniently replaced, namely, the sensor can be disassembled and assembled only by opening the connecting part 110 without going deep into the lower part of the shell 120 for operation; at the same time, the distal end of the support arm 111 may also limit the travel of the stylus 133 by preventing the distal end of the stylus 133 from moving upward. The second end of the sensor of the present invention is not limited to being fixed to the support arm 111.
In an alternative embodiment, as shown in fig. 2, the end face of the connecting portion 110 is provided with a hole; the measuring pen 133 is forward L-shaped, the bottom end of the measuring pen 133 is located at the bottom of the housing 120 and used for limiting the measuring pen 133 to move out of the housing 120, and the top end of the measuring pen 133 is fixedly connected with the bearing 131; the bearing 131 extends into the connecting part 110 from the hole, and the bearing 131 moves up and down in the hole, so that the measuring pen 133 can only move in the vertical direction in the hole, and the horizontal direction outside the hole is prevented from shaking. The bearing 131 is sleeved with a spring, the diameter of the spring is larger than that of the hole, the spring is located between the first fixing part 141 and the end face where the hole of the connecting part 110 is located, and the first fixing part 141 controls the spring to move downwards. The measuring pen 133 is connected with a first fixing member 141 in a snap-fit manner, the supporting arm 111 is connected with a second fixing member 142 in a snap-fit manner, and a first end and a second end of the sensor are respectively fixed on end faces of the first fixing member 141 and the second fixing member 142. The sensor is more convenient and faster to replace by adopting the first fixing piece 141, the second fixing piece 142 and the buckling connection mode; and the first fixing member 141 may also serve as a stopper of the elastic member. The sensor is more convenient and faster to replace by adopting the first fixing piece 141, the second fixing piece 142 and the buckling connection mode; and the first fixing member 141 may also serve as a stopper of the elastic member. The first fixing element 141 and the second fixing element 142 may be clamps, or may be fixed by gluing or the like. When the measuring device is used for measuring, firstly, the 0-level block gauge is measured, the measuring device is placed on a measuring table, the whole measuring device is clamped and fixed by a fixing frame, the probe 134 is in contact with the measuring table, and the zero point is calibrated. A1.5 mm 0 grade block is then placed between the stage of the measurement table and the probe 134 to make the measurement. Finally, the gauge block thickness is measured and the standard deviation is measured at 37 um.
In the present invention, the sensor is a graphene flexible strain sensor, including: the sensor comprises a substrate and a sensing material, wherein the substrate is made of Polydimethylsiloxane (PDMS), and the sensing material is made of a graphene material with a grid structure. More preferably, the sensor lead-out wire is connected to the lower contact plate by a conductive paste.
In an optional embodiment, a lower contact plate is further disposed in the connection portion 110, the sensor is electrically connected to the lower contact plate, the lower contact plate is electrically connected to the data conversion portion 200, and the data conversion portion 200 collects an analog signal through an analog-to-digital conversion circuit (ADC) board to complete measurement and output. The connection mode of the electric connection is a detachable connection mode, so that the replacement of the sensor, the data conversion part 200 and the like is facilitated, and the flexibility of the system is improved. More preferably, the sensor lead-out wire is connected to the lower contact plate through a female pin, and the lower contact plate is connected to the data conversion part 200 through a pogo pin. This detachable electric connection mode for the circuit detachable connection of measuring device inside has made things convenient for the change of sensor, data conversion portion 200 etc. and has improved the flexibility of system. The analog-to-digital conversion circuit board is adopted to collect analog signals, so that the displacement can be simply, quickly and accurately measured.
Further, one end of the connection part 110 is mounted on the top of the housing 120 through a first screwing structure, and the other end is connected with the data conversion part 200 through a second screwing structure. Furthermore, the first screwing structure and the second screwing structure are both of an upper screwing structure and a lower screwing structure. Preferably, the housing is a removable structure composed of at least two parts. The measuring device is detachably installed and connected by adopting a turnbuckle structure at the outer part, and is connected by adopting a detachable electric connection mode at the inner part, so that the device is simple in structure and convenient to disassemble and assemble.
The data conversion part of the present invention includes an upper contact plate connected to a lower contact plate in the measurement part 100, an ADC board connected to the upper contact plate, a main control/power supply board connected to the ADC board, and an interface connected to the main control/power supply board. As shown in fig. 3, one end of the data conversion part is an end cap, and the other end is provided with a connecting buckle 210 for screwing with the measurement part 100; the data conversion part is internally provided with a fixing groove 220 for fixing the main control, power supply board and ADC board, and a fixing jig 230 for fixing the upper contact board.
As shown in fig. 4, the measurement circuit of the contact type displacement sensor measurement device provided by the invention comprises: the measuring unit to and the sampling circuit unit who is connected with the measuring unit, wherein, the measuring unit includes: the flexible strain sensor is connected with the lower contact plate; the sampling circuit unit includes: the device comprises an upper contact plate connected with the lower contact plate, an ADC plate (analog-to-digital conversion circuit board) connected with the upper contact plate, and a main control power supply plate connected with the ADC plate, wherein the main control power supply plate is connected with an upper computer through a power supply interface and outputs; the flexible strain sensor converts tensile strain into an analog signal, the analog signal is transmitted to the ADC board through the lower contact plate and the upper contact plate, and a current digital-to-analog converter (IDAC) in the ADC board measures voltages at two ends of the sensor, transmits the voltages to the main control board and the power panel, and is connected with an upper computer through a power interface and outputs the voltages. The invention has simple measuring circuit and principle, large sensor original signal intensity, much lower complexity of the sampling circuit compared with the current scheme, and no need of complex front-end processing. In addition, the split circuit design is one of the conditions for the fast-dismounting design.
In the invention, the master control and power supply board comprises a stm32f1 master control chip, a tps61252 boost chip, a mic5219-3.3 linear voltage stabilization chip, a mic5219-5.0 linear voltage stabilization chip and a USB-C female seat. The main control chip realizes the functions of a USB CDC virtual serial port protocol, configuration and control of an ADC chip, data transmission and the like; the boosting chip and the two linear voltage stabilizing chips provide low-noise 3.3V and 5V power supplies required by system operation together; the USB-C female socket provides a USB-C interface connection for data transmission and system power supply. The main control and power supply board is connected with the ADC board through the FPC flat cable.
On the ADC board is the ADS1262 analog-to-digital conversion chip, which contains the current digital-to-analog converter IDAC of the current source needed to excite the sensor and is capable of measuring the voltage across the sensor with a resolution of 38.4kHz and 32 bits. The ADC board is connected with the main control board and the power supply board and the upper contact board through FPC flat cables. The analog-to-digital conversion circuit ADC board is adopted to collect analog signals, so that simple, rapid and accurate measurement of displacement can be realized.
The upper contact plate comprises an FPC flat cable interface and a spring needle. The FPC winding displacement interface is used for being connected with the ADC board, and the pogo pin is used for realizing the quick assembly disassembly electrical connection with lower contact plate.
The lower contact plate comprises contacts and a bus interface. The contact is used for being connected with the spring needle of the upper contact plate; the row female interface is used for connecting the sensor lead.
The measuring device of the invention runs part of programs during measurement as follows:
as shown in fig. 5, after the system is powered on, the main control chip and the ADC chip are initialized, and initial IDAC (excitation current) and DR (sampling rate) values of the ADC chip are set, and then the main program enters an idle loop. When ADC data conversion is completed and sampling interruption is generated, the main control chip reads data converted by the ADC, checks and passes the data, and transmits the data through the USB interface. When the USB receives an instruction, operations including start sampling, end sampling, setting a new IDAC, setting a new DR will be performed according to different instructions.
The invention adopts a new measuring circuit to measure the displacement based on the flexible strain sensor, improves the internal structure of the measuring device in order to adapt to the measuring scheme, and adopts a two-section type quick assembly and disassembly structure with the independent measuring part 100 and the independent data conversion part 200, thereby improving the sensitivity of the original signal, reducing the complexity of a sampling circuit, and having the advantages of simple structure, high measuring speed and high accuracy. The quick disassembly and assembly structure can quickly replace the sensor and the sampling circuit, facilitates the multiplexing of the sampling circuit in other equipment, and improves the flexibility of the system. Usually, the sensor needs to be replaced when being tested in scientific research tasks, and the sensor needs to be replaced when being damaged in actual use. Different sampling circuits can provide different precisions (different sampling chips), adapt to sensors with different resistance values (different front-end circuits), and use different modes for data transmission and power supply (wired/wireless). The sampling circuit can be replaced according to specific use requirements.
While the preferred embodiments of the present invention have been illustrated and described, it will be appreciated by those skilled in the art that the foregoing embodiments are illustrative and not restrictive, and that many changes may be made in the embodiment without departing from the spirit and the scope of the appended claims.
Claims (8)
1. A contact displacement sensor measuring device, comprising: a measurement section and a data conversion section, the measurement section including: a shell, a connecting part detachably arranged on the top of the shell, and a sensor and a measuring pen which are positioned in the shell, wherein,
the measuring part is detachably connected with the data conversion part through a connecting part, and the sensor is electrically connected with the data conversion part;
the measuring pen can move up and down in the shell, a probe is arranged at the tail end of the measuring pen, and the probe extends out of the shell from the bottom end face of the shell;
the connecting part is also provided with a supporting arm, and the supporting arm extends towards the bottom in the shell; a lower contact plate is also arranged in the connecting part, the sensor is electrically connected with the lower contact plate, and the lower contact plate is electrically connected with the data conversion part;
the sensor is flexible strain sensor, first end fixed connection in on the measuring pen, second end fixed connection in on the support arm, just first end is higher than the second end, the sensor includes: the sensor comprises a substrate and a sensing material, wherein the substrate is made of polydimethylsiloxane, and the sensing material is made of a graphene material with a grid structure;
when the probe contacts the surface of the measured body and moves relative to the surface of the measured body, the measuring pen is pushed to move upwards to drive the first end of the sensor to move upwards, the first end of the sensor is far away from the second end, the sensor is stretched to generate strain, and the measurement is completed through the data conversion part;
the data conversion section includes: the device comprises an upper contact plate connected with the lower contact plate, an analog-to-digital conversion circuit board connected with the upper contact plate, and a main control power supply board connected with the analog-to-digital conversion circuit board, wherein the main control power supply board is connected with an upper computer through a power supply interface; the sensor converts tensile strain into an analog signal, the analog signal is transmitted to the analog-digital conversion circuit board through the lower contact plate and the upper contact plate, and a current digital-analog converter in the analog-digital conversion circuit board measures voltage at two ends of the sensor, transmits the voltage to the main control board and the power supply board, and outputs the voltage through the power supply interface.
2. The contact type displacement sensor measuring device according to claim 1, wherein a hole is provided on a lower end surface of the connecting portion, and a tip end of the measuring pen protrudes into the connecting portion from the hole.
3. The contact displacement sensor measuring device according to claim 2,
the measuring pen is sleeved with an elastic element,
the elastic element is positioned between the first end of the sensor and the lower end surface of the connecting part,
the measuring pen moves upwards, the elastic element compresses towards the lower end face of the connecting part, the sensor is stretched, and after measurement, the elastic element rebounds downwards to reset the measuring pen.
4. A contact displacement transducer measuring device according to any of claims 1-3, wherein the stylus has a first attachment member snap-fitted thereto, the support arm has a second attachment member snap-fitted thereto, and the first and second ends of the transducer are secured to the end faces of the first and second attachment members, respectively.
5. The contact displacement sensor measuring device according to claim 1, wherein the sensor lead wires are connected to the lower contact plate via a female pin row, and the lower contact plate is connected to the data converting part via pogo pins.
6. The contact type displacement sensor measuring device of claim 5, wherein one end of the connecting part is mounted on the top of the housing through a first screwing structure, and the other end is connected with the data converting part through a second screwing structure.
7. The contact displacement sensor measuring device according to claim 6, wherein the contact displacement sensor measuring device has a pen shape, a pen tip is the probe, the pen tip is the measuring portion, and a pen tail is the data converting portion.
8. A measuring circuit of a contact type displacement sensor measuring device according to claim 1, comprising: a measuring unit, and a sampling circuit unit connected to the measuring unit, wherein,
the measurement unit includes: the flexible strain sensor is connected with the lower contact plate;
the sampling circuit unit includes: the device comprises an upper contact plate connected with the lower contact plate, an analog-to-digital conversion circuit board connected with the upper contact plate, and a main control power supply board connected with the analog-to-digital conversion circuit board, wherein the main control power supply board is connected with an upper computer through a power supply interface;
the flexible strain sensor converts tensile strain into an analog signal, the analog signal is transmitted to the analog-digital conversion circuit board through the lower contact plate and the upper contact plate, and a current digital-analog converter in the analog-digital conversion circuit board measures voltages at two ends of the sensor, transmits the voltages to the main control board and the power supply board, and outputs the voltages through the power supply interface.
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| CN104949609A (en) * | 2015-05-20 | 2015-09-30 | 清华大学 | Flexible graphene sensor and manufacture method thereof |
| CN106778509A (en) * | 2016-11-23 | 2017-05-31 | 清华大学 | A kind of Gait Recognition device and method |
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| DE69904332T2 (en) * | 1999-10-22 | 2003-10-02 | Brown & Sharpe Tesa S.A., Renens | Device for measuring linear or angular displacement |
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