CN203719620U - Portable low-power static state resistance strain gauge - Google Patents
Portable low-power static state resistance strain gauge Download PDFInfo
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- CN203719620U CN203719620U CN201420093462.8U CN201420093462U CN203719620U CN 203719620 U CN203719620 U CN 203719620U CN 201420093462 U CN201420093462 U CN 201420093462U CN 203719620 U CN203719620 U CN 203719620U
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Abstract
The utility model discloses a portable low-power static state resistance strain gauge, and relates to the resistance strain gauge; the resistance strain gauge comprises a Wheatstone bridge formed by an external resistance strain device and a precision resistor arranged in the device; an output of the Wheatstone bridge is connected with a secondary difference amplification circuit; an rear end of the secondary difference amplification circuit is connected with a single end-difference transformation circuit; an output of the single end-difference transformation circuit is connected with an A/D conversion circuit used for converting a simulation signal into a digital signal outputted to a one-chip microcomputer; the one-chip microcomputer is connected with an operation button and a serial port communication circuit; the resistance strain gauge also comprises a power supply outputting +2.048 V voltage to the Wheatstone bridge, the power supply outputs +2.500V voltage to the single end-difference transformation circuit as a reference voltage, and outputs +4.096V voltage to the A/D conversion circuit as a reference voltage; the advantages are that measuring precision can be ensued under a low bridge circuit excitation voltage, power consumption is low, and the resistance strain gauge is convenient to carry and use.
Description
Technical field
The utility model relates to a kind of electric wire strain gauge, and specifically a kind of portable low power-consumption static resistance strainmeter, is applicable to the measurement demands of a plurality of industries to structural stress such as machinery, civil engineering, petrochemical industry, is also applicable to the demand of institution of higher learning's scientific research, teaching simultaneously.
Background technology
Strain ga(u)ge custom is called resistance strain gage, is called for short strainometer or foil gauge.The range of application of strain ga(u)ge is very extensive, and applicable structure comprises Aeronautics and Astronautics device, atomic reactor, bridge, road, dam and various plant equipment, buildings etc.; Applicable material comprises various metals and the nonmetallic materials such as iron and steel, aluminium, timber, plastics, glass, native stone, compound substance.And it is not only applicable to laboratory experiment, model experiment, can also to practical structures or parts, measure at the scene, these features are that any sensing element or sensor can not be compared.In addition, it is also having wide practical use aspect the safety monitoring of structure and equipment.
Strain ga(u)ge is a kind of broad-spectrum high precision mechanics amount sensing element, and its basic task is exactly the deflection of component surface to be changed into the variation of himself resistance, and then is measured by electric wire strain gauge.Conventionally electric wire strain gauge by Wheatstone bridge by the change in resistance of strainometer
be converted to the increment of voltage or electric current, and then pass through the demonstration that signal condition, analog to digital conversion etc. complete final signals collecting and realize strain value by software again.On Vehicles Collected from Market, constant pressure type static resistance strainmeter is more common, and this strainmeter all converts dependent variable to voltage signal by Wheatstone bridge.From promoting strain-ga(u)ge measurement precision, consider, in strainmeter, the driving voltage of Wheatstone bridge is more high better, because according to formula
, higher excitation can obtain higher output voltage, and then contributes to improve the measuring accuracy of strainmeter.But Wheatstone bridge driving voltage is higher very unfavorable to the precision of strain measurement system.This be because, encourage the higher power consumption of strain ga(u)ge that makes to increase, again due between strainometer wire grid and measured material across the not so good substrate of one deck heat conductivility and bonded adhesives, therefore make strain ga(u)ge among localized hyperthermia, temperature error increases, and then reduces the measuring precision.Consider above factor, from promoting the precision of test macro, statical strain indicator should reduce Wheatstone bridge driving voltage when guaranteeing certain accuracy of instrument as far as possible.Currently marketed static resistance strainmeter all can not meet above requirement well, and when Wheatstone bridge is actuated to 2V, instrument error is generally higher than 0.5%.
Summary of the invention
In order to solve existing strainmeter, cannot guarantee asking of measuring accuracy the driving voltage of low bridge road in the situation that
Topic, the utility model provides a kind of portable low power-consumption static resistance strainmeter, guarantees the problem of measuring accuracy in the situation that of the driving voltage of low bridge road, and power consumption is lower, is easier to carry and use.
The utility model is realized with following technical scheme: a kind of portable low power-consumption static resistance strainmeter, by the Wheatstone bridge that in external strain ga(u)ge and instrument, precision resistance forms, the output of Wheatstone bridge connects secondary differential amplifier circuit, secondary differential amplifier circuit rear end connects single-ended-differential transformation circuit, single-ended-differential transformation circuit output connects A/D change-over circuit, A/D change-over circuit is delivered to single-chip microcomputer after converting simulating signal to digital signal, and single-chip microcomputer is connected with operation push-button and serial communication circuit; Also comprise a power supply, described power supply output+2.048V voltage is powered to Wheatstone bridge, and output+2.500V voltage provides reference voltage for single-ended-differential transformation circuit, and output+4.096V voltage provides reference voltage for A/D change-over circuit.
It is further: described secondary differential amplifier circuit comprises two chopping zero-stabilizing amplifier ICL7650, and the output terminal of two chopping zero-stabilizing amplifier ICL7650 connects an instrument amplifier AD620.
Described single-chip microcomputer adopts 51 single-chip microcomputers.
Described single-ended-differential transformation circuit consists of operational amplifier A D8138 and peripheral circuit thereof.
Three groups of precision voltage sources that described precision voltage source is comprised of integrated circuit (IC) chip ADR4520, ADR4525, ADR4540 and peripheral circuit thereof.
The beneficial effects of the utility model are: the power that 1, has greatly reduced Wheatstone bridge by reducing strainmeter driving voltage, and then reduced the request for utilization of strainmeter place test macro to strain ga(u)ge, thereby contribute to improve the precision of test macro, this design has overcome traditional strainmeter and has only focused on accuracy of instrument, thinks little of the defect of strainmeter place test macro overall precision.2, the utility model is optimized the structure of electric wire strain gauge according to the development of current chip technology, has reached the object of lowering apparatus volume and power consumption; 3, the utility model has been strengthened the communication function of strainmeter, and strainmeter all people machine interactive function is all transferred to host computer, meets intelligent instrument development trend, is convenient to customization man-machine interface.4, small volume and less weight, antijamming capability is strong, and stable performance is easy-to-use flexibly.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams;
Fig. 2 is circuit diagram of the present utility model;
Fig. 3 is power circuit diagram of the present utility model;
Fig. 4 is amplifying circuit of the present utility model, single-ended-differential transformation circuit and analog to digital conversion circuit figure.
Embodiment
As shown in Figure 1, a kind of portable low power-consumption static resistance strainmeter, by the Wheatstone bridge that in external strain ga(u)ge and instrument, precision resistance forms, the output of Wheatstone bridge connects secondary differential amplifier circuit, secondary differential amplifier circuit rear end connects single-ended-differential transformation circuit, single-ended-differential transformation circuit output connects A/D change-over circuit, and A/D change-over circuit is delivered to single-chip microcomputer after converting simulating signal to digital signal, and single-chip microcomputer is connected with operation push-button and serial communication circuit; Also comprise a power supply, described power supply output+2.048V voltage is powered to Wheatstone bridge, and output+2.500V voltage provides reference voltage for single-ended-differential transformation circuit, and output+4.096V voltage provides reference voltage for A/D change-over circuit.
As in Figure 2-4, described secondary differential amplifier circuit comprises two chopping zero-stabilizing amplifier ICL7650, and the output terminal of two chopping zero-stabilizing amplifier ICL7650 connects an instrument amplifier AD620.Described single-chip microcomputer adopts 51 single-chip microcomputers.Described single-ended-differential transformation circuit consists of operational amplifier A D8138 and peripheral circuit thereof.Three groups of precision voltage sources that described precision voltage source is comprised of integrated circuit (IC) chip ADR4520, ADR4525, ADR4540 and peripheral circuit thereof.Described A/D change-over circuit adopts analog to digital converter AD7170.
This strainmeter is by ± 5V Power supply.Wheatstone bridge provides accurate Qiao road to encourage by integrated circuit (IC) chip ADR4520, more jointly forms bridge road by built-in resistor and external strainometer, dependent variable is converted into voltage signal output under+2.048V driving voltage; Signal amplification circuit after receiving the voltage signal of Wheatstone bridge, the differential amplification of one-level that first realizes signal by two chopping zero-stabilizing amplifier ICL7650, the secondary of then realizing signal by instrument amplifier AD620 again amplifies; First the signaling conversion circuit part that signal after amplifying forms at operational amplifier A D8138 is adjusted to differential signal, then by analog to digital converter AD7170, is converted to digital signal; First digital signal after conversion is got and is stored in internal memory by monolithic is machine-readable, then by single-chip microcomputer, by serial ports, is sent to host computer.Communication turns serial port circuit with operation push-button by single-chip microcomputer, keyboard circuit and USB and forms, and its function is to realize reading, store and sending of digital signal, realizes corresponding sequential control simultaneously.
Specifically, the precision voltage source circuit that first the ADR4520 chip of this strainmeter forms provides rail-to-rail reference voltage accurately for Wheatstone bridge.This accurately 2.048V bridge excitation voltage guaranteed the precision of electric bridge output signal because from formula
the output of known electric bridge be excited into direct ratio.Mix again the precision resistance of stable performance, can guarantee the stable, accurate of electric bridge output signal.Secondly, the amplifying circuit being comprised of two chopping zero-stabilizing amplifier ICL7650 and instrument amplifier AD620 can be realized stable, the accurately amplification to electric bridge output signal, because this amplifying circuit has very high precision, and input bias current little, lack of proper care little, common mode inhibition capacity is strong, noise is low, stable performance.Finally, two groups of accurate rail-to-rail output voltages that chip ADR4525 and ADR4540 form are respectively single-ended-differential transformation circuit and A/D converter provides Voltage Reference accurately, thereby have guaranteed the accurate conversion of simulating signal to digital signal.
Claims (5)
1. a portable low power-consumption static resistance strainmeter, it is characterized in that: comprise the Wheatstone bridge by precision resistance forms in external strain ga(u)ge and instrument, the output of Wheatstone bridge connects secondary differential amplifier circuit, secondary differential amplifier circuit rear end connects single-ended-differential transformation circuit, single-ended-differential transformation circuit output connects A/D change-over circuit, A/D change-over circuit is delivered to single-chip microcomputer after converting simulating signal to digital signal, and single-chip microcomputer is connected with operation push-button and serial communication circuit; Also comprise a power supply, described power supply output+2.048V voltage is powered to Wheatstone bridge, and output+2.500V voltage provides reference voltage for single-ended-differential transformation circuit, and output+4.096V voltage provides reference voltage for A/D change-over circuit.
2. portable low power-consumption static resistance strainmeter according to claim 1, it is characterized in that: described secondary differential amplifier circuit comprises two chopping zero-stabilizing amplifier ICL7650, the output terminal of two chopping zero-stabilizing amplifier ICL7650 connects an instrument amplifier AD620.
3. portable low power-consumption static resistance strainmeter according to claim 1, is characterized in that: described single-chip microcomputer adopts 51 single-chip microcomputers.
4. portable low power-consumption static resistance strainmeter according to claim 1, is characterized in that: described single-ended-differential transformation circuit consists of operational amplifier A D8138 and peripheral circuit thereof.
5. according to the portable low power-consumption static resistance strainmeter described in claim 1-4 any one, it is characterized in that: three groups of precision voltage sources that described power supply is comprised of integrated circuit (IC) chip ADR4520, ADR4525, ADR4540 and peripheral circuit thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420093462.8U CN203719620U (en) | 2014-03-03 | 2014-03-03 | Portable low-power static state resistance strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420093462.8U CN203719620U (en) | 2014-03-03 | 2014-03-03 | Portable low-power static state resistance strain gauge |
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| Publication Number | Publication Date |
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| CN203719620U true CN203719620U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420093462.8U Expired - Fee Related CN203719620U (en) | 2014-03-03 | 2014-03-03 | Portable low-power static state resistance strain gauge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852002A (en) * | 2014-03-03 | 2014-06-11 | 陈维林 | Portable low-power-consumption static resistance strain indicator |
| CN105973509A (en) * | 2016-05-06 | 2016-09-28 | 武汉航空仪表有限责任公司 | Pressure transducer circuit and commissioning method thereof |
| CN108759652A (en) * | 2018-05-17 | 2018-11-06 | 大连理工大学 | A kind of curvature measurement method based on favour stone full-bridge principle |
| CN112344846A (en) * | 2020-11-06 | 2021-02-09 | 中铁隧道局集团有限公司 | Strain sensor based on radio frequency identification technology for tunnel strain monitoring |
-
2014
- 2014-03-03 CN CN201420093462.8U patent/CN203719620U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852002A (en) * | 2014-03-03 | 2014-06-11 | 陈维林 | Portable low-power-consumption static resistance strain indicator |
| CN105973509A (en) * | 2016-05-06 | 2016-09-28 | 武汉航空仪表有限责任公司 | Pressure transducer circuit and commissioning method thereof |
| CN105973509B (en) * | 2016-05-06 | 2019-10-15 | 武汉航空仪表有限责任公司 | A kind of pressure sensor circuit and its adjustment method |
| CN108759652A (en) * | 2018-05-17 | 2018-11-06 | 大连理工大学 | A kind of curvature measurement method based on favour stone full-bridge principle |
| CN108759652B (en) * | 2018-05-17 | 2019-06-28 | 大连理工大学 | A kind of curvature measurement method based on favour stone full-bridge principle |
| CN112344846A (en) * | 2020-11-06 | 2021-02-09 | 中铁隧道局集团有限公司 | Strain sensor based on radio frequency identification technology for tunnel strain monitoring |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20140716 Termination date: 20150303 |
|
| EXPY | Termination of patent right or utility model |