基于双通道参数检测的高精度应变测量技术

High-precision strain measuring technology based on double-channel parametric measurement

针对应变检测中外界因素对检测结果的干扰,检测电路中器件参数非理想化给检测精度带来的影响,应用双通道参数检测原理,设计了高精度应变检测电路,介绍其工作原理,并对检测电路的转换函数进行误差分析。在此基础上设计了应变检测仪,通过实验验证,应变检测值呈良好的线性关系,而且与理论值很接近,具有较高的测量精度、稳定性、抗干扰性和可靠性。该分析误差的方法在其他电路设计中有一定的参考价值。

Perturbing factors and parameters of the unstable circuit elements bring bad effects on the accuracy of strain measurement. Aimed to improve the accuracy, the measuring circuit based on two-channel parametric measurement with resistance strain-gauge half-bridge is designed. The principle of strain measurement is introduced,then the errors of measuring circuits is analyzed. A measuring system based on the principle is developed. The test indicates that linear values are close to the nominal values and the accuracy, stability, anti- interference and reliability are excellent. The approach of analyzing error is worthwhile for other circuits.