CN102937493A - Measuring circuit for pressure strain gauge - Google Patents
Measuring circuit for pressure strain gauge Download PDFInfo
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- CN102937493A CN102937493A CN2012104369529A CN201210436952A CN102937493A CN 102937493 A CN102937493 A CN 102937493A CN 2012104369529 A CN2012104369529 A CN 2012104369529A CN 201210436952 A CN201210436952 A CN 201210436952A CN 102937493 A CN102937493 A CN 102937493A
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- Prior art keywords
- resistance
- pressure
- amplifier
- strain sheet
- measuring circuit
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Abstract
The invention discloses a measuring circuit for a pressure strain gauge. The measuring circuit comprises the pressure strain gauge, an amplifier A1, resistors R1, R2, R3 and R4 and a direct-current source Vcc. The measuring circuit has the advantages of high gain and low cost.
Description
Technical field
The invention belongs to the mechanical strain fields of measurement, relate in particular to a kind of pressure-strain sheet metering circuit.
Background technology
Resistance strain type sensor is used very extensive, the general bridge circuit structure that adopts, the signal that obtains from strain transducer often is the differential mode feeble signal, amplifier gain is high for this reason, but very expensive and complicated, because present measuring system is more and more huger, therefore, require this pressure-strain sheet metering circuit to have high-gain, characteristics cheaply.
Summary of the invention
The object of the present invention is to provide a kind of pressure-strain sheet metering circuit, be used for measurement and the correction of rotating machinery related pressure.
The technical scheme that realizes above-mentioned purpose is: a kind of pressure-strain sheet metering circuit, comprise the pressure-strain sheet, amplifier (A1), resistance (R1), (R2), (R3), (R4), direct supply (Vcc) wherein:
Resistance in series (R4) between the V+ end of described pressure-strain sheet and the described direct supply (Vcc), and connect with the inverting input of described amplifier (A1) by resistance (R1), V-holds and with reference to resistance in series between the ground level (R3);
The inverting input of described amplifier (A1) and resistance (R1) link, normal phase input end with link with reference to ground level, be in series with feedback resistance (R2) between the output Vout of inverting input and amplifier (A1).
Above-mentioned a kind of pressure-strain sheet metering circuit, resistance (R1) wherein, (R3), (R4) resistance equates, and equaling the pressure-strain sheet, to bear pressure be zero internal resistance, and resistance (R2) equals resistance (R1), (R3), (R4) 10 times.
The present invention is used for the pressure of rotating machinery and answers the limit sheet to measure, and has high-gain, characteristics cheaply.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Please refer to Fig. 1, provided a kind of pressure-strain sheet metering circuit among the figure, comprise that the pressure-strain sheet is YS100C, amplifier AD8628, resistance R 1=100 Ω, R2=1K, R3=100 Ω, R4=100 Ω, direct supply Vcc=5V, wherein:
Resistance in series R4 between the V+ of YS100C end and the described direct supply Vcc, and pass through resistance R 1 and connect with the inverting input of AD8628, the other end and with reference to resistance in series R3 between the ground level;
The inverting input of AD8628 and resistance R 1 link, normal phase input end with link with reference to ground level, be in series with feedback resistance R2 between the output Vout of inverting input and AD8628.
Principle of work of the present invention is: be the variation with the internal resistance when bearing pressure of pressure-strain sheet, reflect into the fixedly variation of high-gain amplifier DC level.
Internal resistance r=100 Ω when YS100C does not bear pressure then exists formula 1 and formula 2, is expressed as follows:
V+=5V* (r+R3)/(R4+r+R3)=10/3V, formula 1
V-=5V* (R3)/(R4+r+R3)=5/3V, formula 2
The formula 3 of AD8628 amplifier is:
Vout=（V+-V-）*（R2/R1)
=5V*r/ (R4+r+R3) * 10 formula 3
=50/3V，
In the formula 3, when YS100C bore pressure, internal resistance r can diminish, and then the DC level of Vout also can correspondingly diminish.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not consist of limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (2)
1. a pressure-strain sheet metering circuit is characterized in that, comprises the pressure-strain sheet, amplifier (A1), resistance (R1), (R2), (R3), (R4), direct supply (Vcc) wherein:
Resistance in series (R4) between the V+ end of described pressure-strain sheet and the described direct supply (Vcc), and connect with the inverting input of described amplifier (A1) by resistance (R1), V-holds and with reference to resistance in series between the ground level (R3);
The inverting input of described amplifier (A1) and resistance (R1) link, normal phase input end with link with reference to ground level, be in series with feedback resistance (R2) between the output Vout of inverting input and amplifier (A1).
2. a kind of pressure-strain sheet metering circuit according to claim 1, it is characterized in that, described resistance (R1), (R3), (R4) resistance equates, and equaling the pressure-strain sheet, to bear pressure be zero internal resistance, and resistance (R2) equals resistance (R1), (R3), (R4) 10 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104369529A CN102937493A (en) | 2012-11-06 | 2012-11-06 | Measuring circuit for pressure strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104369529A CN102937493A (en) | 2012-11-06 | 2012-11-06 | Measuring circuit for pressure strain gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102937493A true CN102937493A (en) | 2013-02-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104369529A Pending CN102937493A (en) | 2012-11-06 | 2012-11-06 | Measuring circuit for pressure strain gauge |
Country Status (1)
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| CN (1) | CN102937493A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808248A (en) * | 2013-07-31 | 2014-05-21 | 镇江市高等专科学校 | Large-span steel structure bridge resistance strain type safety detection device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4169243A (en) * | 1978-04-28 | 1979-09-25 | Burr-Brown Research Corp. | Remote sensing apparatus |
| CN87102198A (en) * | 1987-03-20 | 1988-08-17 | 中国科学院合肥智能机械研究所 | The Method and circuits of simulation of creep compensation in strain-gauge transducer |
| CN2182994Y (en) * | 1993-08-30 | 1994-11-16 | 陈权孝 | High output type sensor for pressure |
| EP1726936A1 (en) * | 2005-05-25 | 2006-11-29 | Hottinger Baldwin Messtechnik Gmbh | Apparatus and method for calibrating strain gauge circuits |
| CN201311561Y (en) * | 2008-10-29 | 2009-09-16 | 李凯 | Novel pillow alarm clock |
| CN102252788A (en) * | 2011-04-06 | 2011-11-23 | 沈怡茹 | Compensation circuit for pressure sensor |
-
2012
- 2012-11-06 CN CN2012104369529A patent/CN102937493A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4169243A (en) * | 1978-04-28 | 1979-09-25 | Burr-Brown Research Corp. | Remote sensing apparatus |
| CN87102198A (en) * | 1987-03-20 | 1988-08-17 | 中国科学院合肥智能机械研究所 | The Method and circuits of simulation of creep compensation in strain-gauge transducer |
| CN2182994Y (en) * | 1993-08-30 | 1994-11-16 | 陈权孝 | High output type sensor for pressure |
| EP1726936A1 (en) * | 2005-05-25 | 2006-11-29 | Hottinger Baldwin Messtechnik Gmbh | Apparatus and method for calibrating strain gauge circuits |
| CN201311561Y (en) * | 2008-10-29 | 2009-09-16 | 李凯 | Novel pillow alarm clock |
| CN102252788A (en) * | 2011-04-06 | 2011-11-23 | 沈怡茹 | Compensation circuit for pressure sensor |
Non-Patent Citations (1)
| Title |
|---|
| 刘宝华: "多通道高精度应变测量技术研究", 《计量学报》, vol. 24, no. 03, 22 July 2003 (2003-07-22), pages 205 - 210 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808248A (en) * | 2013-07-31 | 2014-05-21 | 镇江市高等专科学校 | Large-span steel structure bridge resistance strain type safety detection device |
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Application publication date: 20130220 |