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Weak signal anti-interference detection processing method and device based on Wheatstone bridge

A weak signal and processing method technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as inaccurate strain measurement and interference, achieve waveform stability, improve matching characteristics and drive capabilities

Inactive Publication Date: 2020-10-09
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0018] When there is noise in the bridge circuit composed of strain gauges, the bridge output signal U o Interference, resulting in inaccurate measurement of the corresponding variable

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  • Weak signal anti-interference detection processing method and device based on Wheatstone bridge
  • Weak signal anti-interference detection processing method and device based on Wheatstone bridge
  • Weak signal anti-interference detection processing method and device based on Wheatstone bridge

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Embodiment Construction

[0043] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045]The Wheatstone bridge detection circuit mainly includes two parts: the drive part of the Wheatstone bridge and the bridge output differential signal detection circuit. Among them, the bridge drive signal is the voltage or current signal applied to the two input terminals of the Wheatstone bridge. Usually, the bridge drive input terminal is loaded with a DC or AC voltage / current signal as the drive signal of the bridge circuit. The loaded drive signal requires a relatively High stability, to ensure that the...

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Abstract

The invention discloses a weak signal anti-interference detection processing method and device based on a Wheatstone bridge. According to the method, a Wheatstone bridge is formed by adopting a plurality of sensor elements, a direct current signal UI is generated and loaded to the A end and the C end to drive the Wheatstone bridge, the Wheatstone bridge is used for detecting a weak signal and converting the weak signal into an electric signal, and voltage signals output from the B end and the D end are obtained; the differential signals are amplified by the following amplifiers A1 and A2; a gate circuit controls a signal at a fixed frequency, output signals F and E after pre-amplification and filtering are switched and output and are transmitted to a differential amplifier A3 through a square wave-to-sine wave conversion circuit, the signal is converted into a sinusoidal signal with fixed frequency output, and the output amplitude of the signal is determined through the differential amplifier with fixed amplification times. The method is simple and easy to implement, the output signal is amplified to a certain degree on the basis of the original amplitude, the output signal is fixed to the frequency through switching of the fixed frequency, and therefore interference of noise on the signal can be effectively eliminated through subsequent phase-locked amplification detection.

Description

technical field [0001] The invention relates to a Wheatstone bridge detection circuit, in particular to a method and system for improving anti-interference characteristics based on the Wheatstone bridge detection circuit. Background technique [0002] A bridge is a measurement circuit that converts component parameters such as resistance, inductance, and capacitance into voltage or current. This kind of circuit is simple, high precision and high sensitivity, and is widely used in detection circuits. The conversion of the non-electricity of the resistance strain gauge strain into electricity is to convert the resistance change into a voltage change through the bridge, and then realize the detection of the strain by measuring the change in the output voltage of the bridge. Due to the small change of the strain resistance, it is often disturbed by noise during the detection process, so that the anti-interference processing becomes a particularly important design requirement in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 蔡波朱玉玉王学渊
Owner SOUTHWEAT UNIV OF SCI & TECH
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