CN202562673U - Strain acquisition system based on voltage compensation - Google Patents
Strain acquisition system based on voltage compensation Download PDFInfo
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- CN202562673U CN202562673U CN2012201709844U CN201220170984U CN202562673U CN 202562673 U CN202562673 U CN 202562673U CN 2012201709844 U CN2012201709844 U CN 2012201709844U CN 201220170984 U CN201220170984 U CN 201220170984U CN 202562673 U CN202562673 U CN 202562673U
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- voltage follower
- power supply
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Abstract
The utility model relates to a strain acquisition system based on voltage compensation which comprises a data acquisition device arranged at a data acquisition end, a first voltage follower, a second voltage follower, a reference power supply and a strain sensor which is arranged at a site end. One end of the strain sensor is connected with a positive voltage end of the reference power supply through the first voltage follower, and the other end of the strain sensor is connected with the bottom of the reference power supply through the second voltage follower. A signal output end of the strain sensor is connected with the data acquisition device. The strain sensor is a bridge type strain circuit with a strain resistor. The first voltage follower and the second voltage follower are both voltage followers based on operational amplifiers. The strain acquisition system based on the voltage compensation is simple in structure and high in data acquisition precision.
Description
Technical field
This patent relates to civil engineering work safety monitoring field, particularly a kind of strain acquisition system based on voltage compensation.
Background technology
Bridge strain acquisition system in the civil engineering work safety monitoring field need be carried out the collection of strain data to positions such as the bridge pier of bridge, beam column, telescopic bands.Mainly the foil gauge data of gathering bridge circuit in the bridge strain acquisition system; The position of foil gauge apart from acquisition system distance from several meters to hundreds of rice; And the cable material that is adopted is variant, can produce certain resistance on the circuit of power supply, causes the supply voltage of acquisition system to descend to some extent on the line; Can cause data very big deviation can occur thus less than the voltage of collection terminal at foil gauge power end voltage like this.For reducing this deviation, in the prior art, the employing that has strengthens the pattern of power drives ability, and this mode can be increased in the supply voltage of far-end strain, but still with the reference power supply value error is arranged; The voltage of measuring the strain power end at the scene that has, then with its power values as strain circuit, this mode need be carried out voltage measurement and record to each strain power end, and needs manual maintenance, and automaticity is not high.
Summary of the invention
The technical matters that the utility model will solve is to provide a kind of strain acquisition system based on voltage compensation, should be simple in structure based on the strain acquisition system of voltage compensation, and the data acquisition precision is high.
The technical scheme of utility model is following:
A kind of strain acquisition system based on voltage compensation comprises the data acquisition unit, first voltage follower, second voltage follower and the reference power supply that are arranged on the data acquisition end, also comprises the strain transducer that is arranged on on-the-spot end;
One end of strain transducer connects the positive voltage terminal of reference power supply through first voltage follower; The other end of strain transducer connects the ground of reference power supply through second voltage follower; The signal output part of strain transducer connects data acquisition unit.
Described strain transducer is the bridge-type strain circuit with strain resistor.
First voltage follower and second voltage follower are the voltage follower based on operational amplifier.
Beneficial effect
It is long that the utility model is directed to the on-the-spot circuit of strain measurement; The unsettled phenomenon of supply voltage, a kind of strain acquisition system of proposition based on voltage compensation, the power supply of 2 feeder ears of employing voltage follower guarantee bridge-type strain circuit and the voltage of reference power supply are always; Voltage follower is based on feedback principle; When feedback end voltage changed, voltage follower was adjusted output voltage in real time, thereby the power end voltage that guarantees bridge circuit is identical with reference voltage; Reduced because power supply long line driving force deficiency and errors caused improve the accuracy and the precision of strain data collection.Through adopting shielding line commonly used and voltage follower, total system is simple in structure, practical, and effect is obvious.
Description of drawings
Fig. 1 is the structural representation based on the strain acquisition system of voltage compensation of the utility model.
Label declaration: R1-first resistance, R2-second resistance, R3-the 3rd resistance, the R4-strain resistor, U1-first operational amplifier, U2-second operational amplifier, Vo are the output voltage of strain bridge.
Embodiment
Embodiment 1:
As shown in Figure 1, a kind of strain acquisition system based on voltage compensation comprises the data acquisition unit, first voltage follower, second voltage follower and the reference power supply that are arranged on the data acquisition end, also comprises the strain transducer that is arranged on on-the-spot end; One end of strain transducer connects the positive voltage terminal of reference power supply through first voltage follower; The other end of strain transducer connects the ground of reference power supply through second voltage follower; The signal output part of strain transducer connects data acquisition unit.Described strain transducer is the bridge-type strain circuit with strain resistor.First voltage follower and second voltage follower are the voltage follower based on operational amplifier.
Data acquisition unit is selected the microcontroller of ARM7TDMI-S CPU for use.
This system in use; Is that feedback voltage and reference power supply voltage compare through operational amplifier with the input power positive end voltage of bridge circuit, when transmission line long, when its equivalent resistance causes far-end voltage to descend; If feedback voltage is less than reference power supply voltage; Then increase the driving force of power supply, make it to reach the reference power supply magnitude of voltage, make far-end electric bridge input supply voltage keep the supply voltage consistent with reference power supply; Be that feedback voltage and ground voltage compare with the input power supply negative terminal of bridge circuit equally through operational amplifier; When transmission line long; When its equivalent resistance causes the far-end change in voltage; Then voltage follower changes output voltage thereupon, makes far-end electric bridge input power supply negative terminal voltage keep consistent with ground voltage.Through the pattern of this far end supply collection and feedback, make the supply voltage of far-end bridge circuit reach stationary value, guarantee correctness and precision that strain data is gathered.Data acquisition unit collects the data after power supply is stablized, and changes through AD conversion unit, obtains the resistance of strain resistor, finally obtains the bridge strain data.
If reference voltage stability is high, then the output of bridge circuit just can accurately reflect the variation of strain resistor, after data acquisition unit collects this signal, just can obtain the accurate changing value of strain resistor through converting, thereby guarantee the accuracy that bridge circuit is measured.Employing has the power drives chip of enough driving forces, like AD780, even if when far-end voltage descends, makes reference power supply voltage remain unchanged.
The operational amplifier characteristic requirements is hanged down drift, low biasing, low noise in this system, further guarantees the precision of bridge circuit strain measurement, chooses LM258 in the present embodiment.
In order to make the image data precision higher, AD conversion unit is selected 24 sampling A ADS1246 in this example, and it carries 1 to 128 times amplifier.
Claims (3)
1. the strain acquisition system based on voltage compensation is characterized in that, comprises the data acquisition unit, first voltage follower, second voltage follower and the reference power supply that are arranged on the data acquisition end, also comprises the strain transducer that is arranged on on-the-spot end;
One end of strain transducer connects the positive voltage terminal of reference power supply through first voltage follower; The other end of strain transducer connects the ground of reference power supply through second voltage follower; The signal output part of strain transducer connects data acquisition unit.
2. the strain acquisition system based on voltage compensation according to claim 1 is characterized in that, described strain transducer is the bridge-type strain circuit with strain resistor.
3. the strain acquisition system based on voltage compensation according to claim 1 and 2 is characterized in that, first voltage follower and second voltage follower are the voltage follower based on operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201709844U CN202562673U (en) | 2012-04-20 | 2012-04-20 | Strain acquisition system based on voltage compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201709844U CN202562673U (en) | 2012-04-20 | 2012-04-20 | Strain acquisition system based on voltage compensation |
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| CN202562673U true CN202562673U (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201709844U Expired - Fee Related CN202562673U (en) | 2012-04-20 | 2012-04-20 | Strain acquisition system based on voltage compensation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568304A (en) * | 2013-10-12 | 2015-04-29 | 北京航天计量测试技术研究所 | Data acquisition system for enhanced stress type force sensor |
| CN105388811A (en) * | 2015-11-27 | 2016-03-09 | 成都聚汇才科技有限公司 | Intelligent electric meter control system based on operational amplifier-type information transmission circuit |
| CN110333014A (en) * | 2019-07-31 | 2019-10-15 | 浙江荷清柔性电子技术有限公司 | Strain measurement circuit based on foil gauge |
| CN114935390A (en) * | 2022-05-17 | 2022-08-23 | 常州纺织服装职业技术学院 | Weighing force-measuring sensor for unbalance loading error compensation |
-
2012
- 2012-04-20 CN CN2012201709844U patent/CN202562673U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568304A (en) * | 2013-10-12 | 2015-04-29 | 北京航天计量测试技术研究所 | Data acquisition system for enhanced stress type force sensor |
| CN104568304B (en) * | 2013-10-12 | 2017-11-28 | 北京航天计量测试技术研究所 | One kind enhancing strain force sensor data collecting system |
| CN105388811A (en) * | 2015-11-27 | 2016-03-09 | 成都聚汇才科技有限公司 | Intelligent electric meter control system based on operational amplifier-type information transmission circuit |
| CN110333014A (en) * | 2019-07-31 | 2019-10-15 | 浙江荷清柔性电子技术有限公司 | Strain measurement circuit based on foil gauge |
| CN114935390A (en) * | 2022-05-17 | 2022-08-23 | 常州纺织服装职业技术学院 | Weighing force-measuring sensor for unbalance loading error compensation |
| CN114935390B (en) * | 2022-05-17 | 2023-08-08 | 常州纺织服装职业技术学院 | Weighing force transducer for offset load error compensation |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20150420 |
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| EXPY | Termination of patent right or utility model |