CN1721813A - Constant-current type static resistance strain gauge - Google Patents
Constant-current type static resistance strain gauge Download PDFInfo
- Publication number
- CN1721813A CN1721813A CN 200410041398 CN200410041398A CN1721813A CN 1721813 A CN1721813 A CN 1721813A CN 200410041398 CN200410041398 CN 200410041398 CN 200410041398 A CN200410041398 A CN 200410041398A CN 1721813 A CN1721813 A CN 1721813A
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- Prior art keywords
- resistance
- circuit
- constant current
- analog switch
- static resistance
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- 230000003068 static effect Effects 0.000 title claims description 14
- 239000011888 foil Substances 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 230000004936 stimulating effect Effects 0.000 abstract 2
- 238000005259 measurement Methods 0.000 description 8
- 239000004020 conductor Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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Abstract
The invention relates to a constant current supply and electric analog switch circuit, which are positioned on the input end of bridge circuit. It adopts constant current stimulating electric switching technique to exclude the resistance of electric analog switch circuit out of the variation of bridge measuring circuit, so that the output voltage of straining-meter is relative to stimulating circuit, straining resistance, straining sheet sensitivity index and straining value and non-relative to wire resistance and analog switch resistance. It is suit for measuring constructing stress in the field of mechanism and building project.
Description
Technical field
The present invention relates to a kind of instrument of structural member stress test, relate in particular to a kind of constant current mode static resistance strainmeter.
Background technology
Strain ga(u)ge is subjected to stress-strain to be converted to resistance variations component surface, because the member strain is generally less, in order to guarantee certain measuring accuracy, requires the sensitivity of surveying instrument can reach the 1-5 microstrain.The general electric wire strain gauge that adopts is converted to the increment Delta I or the Δ V of curtage to the Δ R/R of strainometer, and amplifies through electron-amplifier, shows with strain numerical value at last or send Computer Processing.Constant voltage static resistance strainmeter at present commonly used, in the direct current bridge of strainmeter, one group of resistance is the balance fixed resistance, one group of resistance is strain ga(u)ge resistance, a resistance is the work strain meter in this group, another resistance is the temperature compensation strainometer, and actual measurement is measured for the multiple spot static strain, is connected to reed switch relay for this reason in the foil gauge resistance loop measuring point is switched.From the practice of using, there are following some shortcomings in existing constant pressure type static resistance strainmeter: the one, and it is non-linear that the electric bridge characteristic exists, and when measuring strain greater than 5000 microstrains, error slightly is equal to or greater than-0.5%; The 2nd, long lead compensation when lead is longer, be revised the strain measured value, and the length of used lead, sectional area all should be identical, if measurement environment is very abominable, then can causes the variation of conductor resistance, thereby influence the precision of strain measurement value; The 3rd, the contact resistance of relay is big, and temperature effect is big, and relay is short serviceable life, and switch speed is slow, and price is high and volume is big.
Goal of the invention
Purpose of the present invention is at existing constant pressure type static resistance strainmeter above shortcomings, a kind of non-linear, no long lead compensation that does not have an electric bridge characteristic is provided and measuring point is switched and the constant current mode static resistance strainmeter of long service life fast.
The objective of the invention is to be achieved through the following technical solutions, a kind of constant current mode static resistance strainmeter, comprise housing, the bridge circuit of forming by sample resistance in external foil gauge resistance and the housing, the differential amplifier that the output terminal of bridge circuit connects, the wave filter that connects behind the differential amplifier, A/D change-over circuit, storer and control circuit is characterized in that the source end of bridge circuit connects the constant current source and the electronic analog switch circuit of serial connection, is connected in series impact damper in the two sample resistance front end place arms.
The present invention is provided with constant current source and electronic analog switch circuit by the input end at bridge circuit, adopt constant current drive electronic switch handoff technique, thoroughly having overcome existing strainmeter uses hand switch and relay contact to carry out all drawbacks that bridge circuit switches, with the resistor chain of electronic analog switch circuit except that changing in the bridge circuit test resistance, therefore the strainmeter output voltage only and exciting current, strain resistor, the foil gauge sensitivity coefficient, strain value is relevant, irrelevant with conductor resistance, also irrelevant with electronic analog swtich resistance, simultaneously, for big strain measurement, there is not bridge circuit non-linear yet, volume of the present invention is little, in light weight, antijamming capability is strong, and good stability is the existing fabulous substitute products of constant pressure type static resistance strainmeter, be applicable to machinery, multi-field measurement to structural stress such as civil engineering also is to carry out scientific research, one of important instrument of teaching.
Description of drawings
Accompanying drawing 2 is partial circuit figure of the present invention;
In the accompanying drawing, resistance R
1, R
2, the foil gauge resistance R
S1, R
S2, sample resistance R
3, R
4, diode V
1, capacitor C
1, integrated circuit N
1(741), N
2(4051), N
3(LF353), N
4, interface A, B, C, B '.
Embodiment
The present invention is by comprising integrated circuit N in housing, the housing
1(741) and the constant current source formed of peripheral circuit, integrated circuit N
2(4051) electronic analog switch circuit of Zu Chenging, external foil gauge resistance R
S1, R
S2With sample resistance R
3, R
4The bridge circuit of forming, sample resistance R
3, R
4Front end place arm serial connection by integrated circuit N
3(LF353) the integrated circuit N of impact damper of Zu Chenging and bridge circuit output terminal connection
4The wave filter that connects behind differential amplifier of forming and the differential amplifier, A/D change-over circuit, storer and control circuit constitute, and constant current source and the input end that is connected on bridge circuit after electronic analog switch circuit is connected in series are at sample resistance R
3, R
4Preceding serial connection impact damper, effect is that interior half-bridge adopts constant voltage driving by impact damper, constant current source passes through lead, foil gauge R again through electronic analog swtich
S1, R
S2Produce voltage at A, B point, produce voltage by two impact dampers at B ' point again, VB, VB ' send differential amplifier amplification, filtering, AD to gather, and show with strain numerical value at last or send Computer Processing.From accompanying drawing 1 as can be known, VA-VC=(R
S1+ R
S2+ r) I, VB-VC=(R
S2+ r) I, VB '=(VA+VC)/2, r is a conductor resistance in the formula, R
S1, R
S2Be foil gauge resistance, R
3, R
4It is sample resistance.For being total to compensating measure, active gage R
S1=R+ Δ R, compensating plate R
S2=R.If R
3=R
4, VB '-VB=(VA-VC)/2-(R+r) I=(2R+ Δ R+2r) I/2-(R+r) I=Δ RI/2=IR (Δ R/R)/2=IRK ε/2 then.For two measurements, active gage R
S1=R+ Δ R, active gage R
S2=R-Δ R, VB '-VB=IRK ε.For four measurements, then need not add impact damper, R
3, R
4Be active gage equally, through simple computation, VB '-VB=IRK ε.By analyzing as can be known, no matter the present invention is what bridge circuit form, and the strainmeter output voltage is only relevant, irrelevant with conductor resistance, also irrelevant with electronic analog swtich resistance with exciting current, foil gauge resistance, foil gauge sensitivity coefficient, strain value.Simultaneously, for big strain measurement, there is not bridge circuit non-linear yet.
Claims (4)
1 one kinds of constant current mode static resistance strainmeters, comprise housing, the bridge circuit of forming by sample resistance in external foil gauge resistance and the housing, the differential amplifier that the output terminal of bridge circuit connects, the wave filter that connects behind the differential amplifier, A/D change-over circuit, storer and control circuit, it is characterized in that the source end of bridge circuit connects the constant current source and the electronic analog switch circuit of serial connection, is connected in series impact damper in the two sample resistance front end place arms.
2, constant current mode static resistance strainmeter according to claim 1 is characterized in that constant current source is made of integrated circuit 741 and peripheral circuit thereof.
3, constant current mode static resistance strainmeter according to claim 1 is characterized in that electronic analog switch circuit is made of integrated circuit 4051.
4, constant current mode static resistance strainmeter according to claim 1 is characterized in that impact damper is made of integrated circuit LF353.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410041398 CN1721813A (en) | 2004-07-14 | 2004-07-14 | Constant-current type static resistance strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410041398 CN1721813A (en) | 2004-07-14 | 2004-07-14 | Constant-current type static resistance strain gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1721813A true CN1721813A (en) | 2006-01-18 |
Family
ID=35912299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410041398 Pending CN1721813A (en) | 2004-07-14 | 2004-07-14 | Constant-current type static resistance strain gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1721813A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329161B (en) * | 2007-06-22 | 2011-10-05 | 上海自动化仪表股份有限公司 | Multifunctional Static Strain Gauge |
| CN102288337A (en) * | 2011-06-15 | 2011-12-21 | 基康仪器(北京)有限公司 | Method and device for measuring differential resistance type sensor |
| CN103017949A (en) * | 2012-11-28 | 2013-04-03 | 安徽埃克森科技集团有限公司 | Piezoresistive pressure sensor with vibration compensation |
| 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 |
| CN105136357A (en) * | 2015-09-29 | 2015-12-09 | 中国地质科学院地质力学研究所 | Foil gauge measure circuit and hollow inclusion strain gauge measurement system |
| CN105547341A (en) * | 2014-10-31 | 2016-05-04 | 南京河海南自水电自动化有限公司 | Apparatus and method for measuring five-wire-system differential resistor type sensor |
| CN107449351A (en) * | 2017-08-14 | 2017-12-08 | 陕西理工学院 | Strain gauge sorter and method for separating |
-
2004
- 2004-07-14 CN CN 200410041398 patent/CN1721813A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329161B (en) * | 2007-06-22 | 2011-10-05 | 上海自动化仪表股份有限公司 | Multifunctional Static Strain Gauge |
| CN102288337A (en) * | 2011-06-15 | 2011-12-21 | 基康仪器(北京)有限公司 | Method and device for measuring differential resistance type sensor |
| CN103017949A (en) * | 2012-11-28 | 2013-04-03 | 安徽埃克森科技集团有限公司 | Piezoresistive pressure sensor with vibration compensation |
| 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 |
| CN105547341A (en) * | 2014-10-31 | 2016-05-04 | 南京河海南自水电自动化有限公司 | Apparatus and method for measuring five-wire-system differential resistor type sensor |
| CN105547341B (en) * | 2014-10-31 | 2018-07-27 | 南京河海南自水电自动化有限公司 | A kind of device and method measuring five-wire system differential resistance type sensor |
| CN105136357A (en) * | 2015-09-29 | 2015-12-09 | 中国地质科学院地质力学研究所 | Foil gauge measure circuit and hollow inclusion strain gauge measurement system |
| CN105136357B (en) * | 2015-09-29 | 2017-11-17 | 中国地质科学院地质力学研究所 | A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system |
| CN107449351A (en) * | 2017-08-14 | 2017-12-08 | 陕西理工学院 | Strain gauge sorter and method for separating |
| CN107449351B (en) * | 2017-08-14 | 2023-08-11 | 陕西理工学院 | Strain gauge sorting instrument and sorting method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |