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Detection circuit for non-common mode voltage strain bridge signal

A strain bridge and signal detection technology, which is applied in the field of signal detection, can solve problems such as signal distortion and adverse effects of measurement signals, and achieve the effect of improving the accuracy of signal measurement

Active Publication Date: 2010-02-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Generally, the bridge detection circuit is powered by a single power supply, and there is a common-mode voltage at the bridge output, which will have a negative impact on the measurement signal and cause signal distortion

Method used

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  • Detection circuit for non-common mode voltage strain bridge signal

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Embodiment Construction

[0010] The purpose of the strain bridge signal detection circuit without common-mode voltage is to provide a strain bridge signal detection circuit with no common-mode voltage output from the bridge and high signal detection accuracy.

[0011] The characteristics of the non-common-mode voltage strain bridge signal detection circuit are: including a symmetrical precision excitation power supply, an instrumentation amplifier and a strain bridge, wherein:

[0012] The symmetrical precision excitation power supply provides positive and negative symmetrical excitation voltages to the strain bridge. The input power outputs a precision voltage +V11 through the precision voltage source chip U1 and the triode T11. The triode T11 is used to expand the output current of U1. The output terminal of the precision voltage source U1 is connected to into the base of NPN tube T11, and the emitter of NPN tube T11 outputs the required strain bridge precision excitation voltage +V11; +V11 is connec...

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Abstract

A detection circuit for a non-common mode voltage strain bridge signal is applied to engineering technical fields in a wind tunnel aerodynamic test such as balance signal detection and measurement onmoment, pulling pressure, acceleration and the like, belonging to the signal detection technical field. The detection circuit is characterized by comprising a symmetric precision excitation power supply, an instrumentation amplifier, a strain bridge and the like, wherein, the symmetric precision excitation power supply is used for supplying excitation voltage with symmetric positive and negative poles for the strain bridge so as to eliminate common mode voltage applied to the poweramp instrumentation amplifier; the relative effective signal can be generally reduced by 40dB to 80dB; and the instrumentation amplifier with high input impedance performs differential amplification on the measurement signal output by the bridge to generate an electrical signal which facilitates to be measured. The detection circuit has the advantage that: the bridge outputs non-common mode voltage, which can improve signal measurement accuracy by fully utilizing high common mode rejection ratio property of the instrumentation amplifier.

Description

technical field [0001] The non-common-mode voltage strain bridge signal detection circuit is used in the engineering technology fields such as balance signal detection in wind tunnel aerodynamic tests and torque, tension pressure, acceleration measurement, etc., and belongs to the signal detection technology field. Background technique [0002] Usually, the bridge detection circuit is powered by a single power supply, and there is a common-mode voltage at the bridge output, which will have a negative impact on the measurement signal and cause signal distortion. The non-common-mode voltage strain bridge signal detection circuit is powered by a positive and negative symmetrical excitation power supply to eliminate the common-mode voltage applied to the instrumentation amplifier in the subsequent stage, and can make full use of the high common-mode rejection ratio characteristics of the instrumentation amplifier to improve the signal. Measurement accuracy. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/00
Inventor 朱纪洪
Owner TSINGHUA UNIV
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