应变测量仪的自校准电路设计及应用

Design and application of a self⁃calibration circuit for strain measuring instrument

为解决应变测量仪在使用分流法进行校准时存在的费时耗力效率低下、精度不足等问题,实现应变信号的高精度采集,研究并设计了低漂移、低噪声的自校准电路,程控配置采集通道和校准信号,拟合出采集信号和自校准信号之间的函数关系式,获取校准系数,对应变测量结果进行校正,有效降低应变测量的温度漂移误差和噪声误差,满足应变测量仪精度的指标要求。

In order to solve the problems of time⁃consuming,labor⁃intensive,low efficiency and insufficient accuracy in the calibration of strain gauges using the split flow method and achieve high⁃precision acquisition of strain signals,a low drift and low noise self⁃calibration circuit has been studied and designed.The acquisition channel and calibration signal are configured by program control.The functional relationship between the acquisition signal and the self⁃calibration signal is fitted,and the calibration coefficient is obtained.The strain measurement results are corrected,which effectively reduces the temperature drift error and noise error of strain measurement and meets the accuracy requirements of strain measuring instruments.