基于惠斯通电桥的弯曲应变测量灵敏度研究.

Wheatstone bridges are widely used in modern measurement technology as well as in the field of automatic control.This paper theoretically analyzes the relationship between the voltage sensitivity of the Wheatstone bridge and the parameters of the components in the composed circuit, discuss several key factors affecting the voltage sensitivity of bridges, and derive the parameter conditions for obtaining the maximum voltage sensitivity. The analysis results show that the voltage sensitivity of the Wheatstone bridge is mainly determined by the ratio of the resistances on the adjacent sides of the bridge,and the equalarm bridge has the maximum sensitivity.At the same time,considering the nonlinearity of the bridge output voltage and the relative rate of change of the resistance,this paper build an experimental test device using resistive strain gauges in a half-bridge differential way to eliminate the influence of the bridge voltage nonlinearity. Finally, in this paper,the half-bridge differential bridge was built independently to measure the voltage sensitivity under different strain states. The experimental results show that the bridge voltage is linear with the degree of strain in the bending strain condition through the half-bridge differential connection method. [ABSTRACT FROM AUTHOR]