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Resistance sensor measuring circuit for measuring weak signals

A resistance sensor, weak signal technology, applied in the field of sensor signal conversion and measurement, can solve the problems of single-arm bridge output nonlinearity, low bridge sensitivity, etc.

Pending Publication Date: 2020-01-10
BEIJING SINO CANBRIDGE MED TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a resistance sensor measurement circuit for measuring weak signals, which solves the technical problems of single-arm bridge input and output nonlinearity and low bridge sensitivity

Method used

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  • Resistance sensor measuring circuit for measuring weak signals
  • Resistance sensor measuring circuit for measuring weak signals
  • Resistance sensor measuring circuit for measuring weak signals

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Embodiment 1

[0027] Such as figure 1 As shown, the present invention provides a resistance sensor measuring circuit for measuring weak signals, comprising: bridge arm resistance R3, bridge arm resistance R4, bridge arm resistance R1, resistance sensor R2, DC excitation voltage source, operational amplifier, and the bridge arm Resistor R3, bridge arm resistance R4, bridge arm resistance R1, resistance sensor R2 and operational amplifier form a balanced differential amplifier circuit structure. The measurement point of the reference bridge arm is connected to the non-inverting terminal of the operational amplifier, and the measurement point of the bridge arm where the resistance sensor R2 is located Connect the inverting terminal of the operational amplifier, the resistance sensor R2 is also used as the feedback resistance of the operational amplifier, and the output voltage change of the operational amplifier is proportional to the relative change rate of the resistance sensor R2.

[0028] ...

Embodiment 2

[0048] Such as Figure 4 As shown, the present invention provides another resistance sensor measurement circuit for measuring weak signals, including: differential resistance sensor R3, differential resistance sensor R4, reference resistance R1, reference resistance R2, DC excitation voltage source, operational amplifier, the The change directions of the differential resistance sensor R3 and the differential resistance sensor R4 are opposite, and the differential resistance sensor R3, the differential resistance sensor R4, the reference resistance R1, the reference resistance R2, and the operational amplifier form a balanced differential amplifier circuit structure, so The above-mentioned differential resistance sensor R3 and differential resistance sensor R4 form a bridge arm, and its measurement point is connected to the same-phase terminal of the operational amplifier; the reference resistance R1 and the reference resistance R2 form another bridge arm, and one of them is use...

Embodiment 3

[0056] Such as Figure 5 As shown, the present invention also provides another resistance sensor measurement circuit for measuring weak signals, including: differential resistance sensor R4, differential resistance sensor R2, reference resistance R3, reference resistance R1, DC excitation voltage source, operational amplifier, and The change directions of the differential resistance sensor R4 and the differential resistance sensor R2 are opposite, the differential resistance sensor R4, the differential resistance sensor R2, the reference resistance R3, the reference resistance R1, and the operational amplifier form a balanced differential amplifier circuit structure, The reference resistor R3 and the differential resistance sensor R4 form a bridge arm, the reference resistor R1 and the differential resistance sensor R2 form another bridge arm, and the measurement points of the two bridge arms are respectively connected to the non-inverting terminal and the inverting terminal of...

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Abstract

The invention provides a resistance sensor measuring circuit for measuring weak signals and belongs to the technical field of sensor signal conversion and measurement. The circuit comprises a bridge arm resistor R3, a bridge arm resistor R4, a bridge arm resistor R1, a resistance sensor R2, a direct current excitation voltage source and an operational amplifier; the bridge arm resistor R3, the bridge arm resistor R4, the bridge arm resistor R1, the resistance sensor R2 and the operational amplifier form a balanced type differential amplification circuit structure; the resistance sensor R2 serves as the feedback resistor of the operational amplifier; and the output voltage variation quantity of the operational amplifier is in direct proportion to the relative change rate of the resistance sensor R2. The circuit is mainly used for precisely measuring weak signals.

Description

technical field [0001] The invention relates to a resistance sensor measurement circuit for measuring weak signals, which belongs to the measurement and conversion technology of tiny signals of electric bridge measurement circuits, and belongs to the technical field of sensor signal conversion and measurement. Background technique [0002] Many sensors can convert a certain physical quantity into a change in electrical parameters such as resistance or capacitance, and the physical quantity to be measured can be indirectly measured by measuring the change in the corresponding electrical parameter. In most cases, the changes of these electrical parameters are extremely weak, and it is difficult to guarantee the precision and accuracy of ordinary measurement methods. The electric bridge is an effective means to measure such weak resistance and capacitance changes. A bridge is a comparative measuring instrument similar to a balance. The electric bridge places the sensor itself...

Claims

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Application Information

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IPC IPC(8): G01R17/10
CPCG01R17/10
Inventor 吴远星王晓琴王洪超宋军华薄云峰
Owner BEIJING SINO CANBRIDGE MED TECH CO LTD
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