CN203241176U - Non-linear compensating circuit of pressure sensor - Google Patents
Non-linear compensating circuit of pressure sensor Download PDFInfo
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- CN203241176U CN203241176U CN 201320212924 CN201320212924U CN203241176U CN 203241176 U CN203241176 U CN 203241176U CN 201320212924 CN201320212924 CN 201320212924 CN 201320212924 U CN201320212924 U CN 201320212924U CN 203241176 U CN203241176 U CN 203241176U
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- pressure transducer
- signal amplification
- amplification circuit
- pressure sensor
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Abstract
The utility model relates to a non-linear compensating circuit of a pressure sensor and employs a hardware technology for conducting the non-linear compensation. The compensating circuit comprises an excitation voltage source Vr, a non-linear compensation operation circuit, a pressure sensor electrical bridge, and a signal amplification circuit, wherein an output terminal of the signal amplification circuit goes through voltage division conducted by a voltage dividing resistor R1 and a voltage dividing resistor R2 and then is connected with an input negative terminal of the non-linear compensation operation circuit through an input resistor R3; the excitation voltage source Vr is connected with an input positive terminal of the non-linear compensation operation circuit through an input resistor R5; a pressure signal sensed by the pressure sensor electrical bridge is amplified by the signal amplification circuit and synthesized with the excitation voltage source Vr in an appropriate proportion by changing the ratios of the voltage dividing resistors so as to supply power to the pressure sensor electrical bridge, thereby realizing the non-linear compensation of the pressure sensor. Moreover, the signal amplification circuit can implement the digital zero and full scale debugging, thereby reducing the influence of low precision and poor stability caused by replacement of the resistors in the debugging process and realizing the low-cost high-precision pressure measurement.
Description
Technical field
The utility model relates to art of pressure sensors, specifically, relates to the compensating circuit of pressure transducer.
Background technology
Pressure transducer is the widely used surveying instrument in each field of industrial process, meteorology, environmental protection and even defence engineering, be subjected to the restriction of material, technology, most pressure transducer is the sensor of electric bridge (resistance) output type particularly, when the linear variation of pressure signal, sensor output voltage is not linear, can bring thus the error near 1%, make the measuring accuracy of sensor very low.
For the pressure transducer with nonlinear characteristic, existing processing mode has two kinds, and a kind of is not carry out nonlinear compensation, directly the output signal of sensor is amplified, and giving follow-up Displaying Meter or control system, prerequisite is less demanding to measuring accuracy; Another kind is to its non-linear compensating, the method that adopts has look-up table, curve fitting method and neural network, these three kinds of methods all are to adopt single-chip microcomputer, by pressure transducer being carried out the test of parameters in series, parameter after the test is processed through software, the output signal that obtains has like this been eliminated the non-linear impact that brings, measuring accuracy is greatly improved, but also bring thus the raising of material cost, labor intensive, spended time, thereby the manufacturing of the fiber grating sensors cost is increased, in time volume shipment.
The utility model content
The utility model is low for the measuring accuracy that existing pressure transducer exists, high in cost of production the problems referred to above, a kind of non-linear compensation circuit of pressure transducer is provided, this non-linear compensation circuit can be realized the high-acruracy survey of pressure transducer, and cost is low, is easy to the batch production of sensor.
The technical solution of the utility model: a kind of non-linear compensation circuit of pressure transducer comprises excitation voltage source Vr, nonlinear compensation computing circuit, pressure transducer electric bridge and signal amplification circuit.The output terminal of signal amplification circuit is connected input resistance R3 by divider resistance R1 and is connected with the input negative terminal of nonlinear compensation computing circuit with divider resistance R2 dividing potential drop, excitation voltage source Vr is connected on behind the input anode of nonlinear compensation computing circuit the output voltage formation subtraction circuit with signal amplification circuit by input resistance R5; The output terminal of nonlinear compensation computing circuit is connected with the supply voltage anode of pressure transducer electric bridge, and the output terminal of pressure transducer electric bridge is connected with the input end of signal amplification circuit, and the supply voltage negative terminal of pressure transducer electric bridge connects signal ground.
Preferably, signal amplification circuit adopts the programmable gain amplifier PGA with capable of regulating zero-bit, full scale.
The beneficial effects of the utility model: the utility model utilizes hardware technology to carry out nonlinear compensation, pressure (the being voltage) signal that the pressure transducer electric bridge is experienced amplifies through signal amplification circuit, by changing the ratio of divider resistance, with proper proportion and the synthetic rear pressure transducer electric bridge power supply of giving of excitation voltage source Vr, the output voltage that makes the nonlinear compensation computing circuit reduces with the increase of pressure transducer bridge output voltage sensitivity, the value equal and opposite in direction that the amount that reduces is lucky and the sensitivity of pressure transducer bridge output voltage increases progressively, opposite direction, thereby realize the nonlinear compensation to pressure transducer, and the range of pressure transducer is once determining, compensating parameter just can be determined, be easy to batch production, can accomplish nonlinearity erron≤0.025%FS.Signal amplification circuit of the present utility model adopts the programmable gain amplifier PGA with adjustable zero position, full scale, can impose numeral debugging zero-bit and full scale, reduced further to have improved measuring accuracy and the stability of pressure transducer owing to changing the impact that precision is low, degree of stability is poor that resistance brings in the debug process.
Description of drawings
Accompanying drawing 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
A kind of non-linear compensation circuit of pressure transducer comprises excitation voltage source Vr, nonlinear compensation computing circuit, pressure transducer electric bridge and signal amplification circuit.The output terminal of signal amplification circuit is connected input resistance R3 by divider resistance R1 and is connected with the input negative terminal of nonlinear compensation computing circuit with divider resistance R2 dividing potential drop, excitation voltage source Vr is connected on behind the input anode of nonlinear compensation computing circuit the output voltage formation subtraction circuit with signal amplification circuit by input resistance R5; The output terminal of nonlinear compensation computing circuit is connected with the supply voltage anode of pressure transducer electric bridge, and the voltage of this output terminal is used for powering to the pressure transducer electric bridge as the driving source of pressure transducer electric bridge; The output terminal of pressure transducer electric bridge is connected with the input end of signal amplification circuit, and the supply voltage negative terminal of pressure transducer electric bridge connects signal ground.
Above-mentioned excitation voltage source Vr is reference voltage source.
Four arms of above-mentioned pressure transducer electric bridge (resistance) are equiarm.
It is upper Parabolic pressure transducer that this example is fit to curve of output, and its maximum nonlinearity erron appears at the range mid point, and signal amplification circuit adopts the programmable gain amplifier PGA with digital adjustable zero position, full scale.
Principle of work: the pressure transducer electric bridge is converted to voltage signal with the pressure signal of experiencing, this voltage signal through signal amplification circuit amplify and by divider resistance R1 and divider resistance R2 dividing potential drop after as the input negative terminal voltage of nonlinear compensation computing circuit, the excitation voltage source voltage of pressure transducer is as the positive terminal voltage of the input of nonlinear compensation computing circuit, thereby formation subtraction circuit, behind the nonlinear compensation computing circuit, give again the power supply of pressure transducer electric bridge, can realize that to output signal sensitivity increases progressively the nonlinear compensation of the electric bridge output type pressure transducer of (or successively decreasing).When the sensitivity of pressure transducer increases progressively, as shown in drawings, as long as change the ratio of R1, R2, the output voltage that just can make the nonlinear compensation computing circuit reduces with the increase of pressure transducer bridge output voltage sensitivity, if it is suitable that the ratio of R1 and R2 is selected, the output voltage that just can make the nonlinear compensation computing circuit reduces with the increase of bridge output voltage sensitivity, the amount that reduces just and Sensitivity in Pressure Sensors the value equal and opposite in direction, the opposite direction that increase progressively, thereby just realized the nonlinear compensation of pressure transducer.
More than be ultimate principle of the present utility model and feature; the utility model embodiment can not only limit to this; technician for the industry; under the prerequisite that does not break away from the utility model thinking; also can make other similar changes, and this all should be considered as the desired protection domain of the utility model claims.
Claims (2)
1. the non-linear compensation circuit of a pressure transducer, it is characterized in that: comprise excitation voltage source Vr, nonlinear compensation computing circuit, pressure transducer electric bridge and signal amplification circuit, the output terminal of signal amplification circuit is connected input resistance R3 by divider resistance R1 and is connected with the input negative terminal of nonlinear compensation computing circuit with divider resistance R2 dividing potential drop, excitation voltage source Vr is connected on behind the input anode of nonlinear compensation computing circuit the output voltage formation subtraction circuit with signal amplification circuit by input resistance R5; The output terminal of nonlinear compensation computing circuit is connected with the supply voltage anode of pressure transducer electric bridge, and the output terminal of pressure transducer electric bridge is connected with the input end of signal amplification circuit, and the supply voltage negative terminal of pressure transducer electric bridge connects signal ground.
2. the non-linear compensation circuit of pressure transducer according to claim 1 is characterized in that: the programmable gain amplifier PGA that the signal amplification circuit employing has adjustable zero position, full scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320212924 CN203241176U (en) | 2013-04-24 | 2013-04-24 | Non-linear compensating circuit of pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320212924 CN203241176U (en) | 2013-04-24 | 2013-04-24 | Non-linear compensating circuit of pressure sensor |
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| Publication Number | Publication Date |
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| CN203241176U true CN203241176U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320212924 Expired - Fee Related CN203241176U (en) | 2013-04-24 | 2013-04-24 | Non-linear compensating circuit of pressure sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278290A (en) * | 2013-04-24 | 2013-09-04 | 青岛航天半导体研究所有限公司 | Non-linear compensation circuit of pressure sensor |
| CN104135373A (en) * | 2014-08-01 | 2014-11-05 | 淮南润成科技股份有限公司 | Mining sensor signal separator |
| CN114112093A (en) * | 2021-11-22 | 2022-03-01 | 海安市综合检验检测中心 | Thermal resistance temperature measurement circuit with sampling signal linearization function |
-
2013
- 2013-04-24 CN CN 201320212924 patent/CN203241176U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278290A (en) * | 2013-04-24 | 2013-09-04 | 青岛航天半导体研究所有限公司 | Non-linear compensation circuit of pressure sensor |
| CN104135373A (en) * | 2014-08-01 | 2014-11-05 | 淮南润成科技股份有限公司 | Mining sensor signal separator |
| CN104135373B (en) * | 2014-08-01 | 2017-10-31 | 淮南润成科技股份有限公司 | Mine sensors demultiplexer |
| CN114112093A (en) * | 2021-11-22 | 2022-03-01 | 海安市综合检验检测中心 | Thermal resistance temperature measurement circuit with sampling signal linearization function |
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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: 20131016 Termination date: 20150424 |
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| EXPY | Termination of patent right or utility model |