一、前言提高动态应变测量的精度及测试数据的可靠性,长期以来一直是应变测试技术所面临的问题。影响动态测试精度的主要因素是测试仪器的非线性误差、稳定性误差及频率特性误差等。其中频率特性误差受两方面的影响:一方面由于目前国内外动态电阻应变仪多采用交流载波放大形式。这样从电路本身就限制了它的频率特性,特别是在进行高频信号测试时,其误差将会更大(包括波形的失真和幅 I. INTRODUCTION Improving the accuracy of dynamic strain measurement and the reliability of test data has long been a challenge for strain measurement technology. The main factors that affect the accuracy of dynamic test are the nonlinear error, stability error and frequency characteristic error of the test equipment. Among them, the error of frequency characteristic is affected by two aspects: on the one hand, the dynamic resistance strain gauges at home and abroad often adopt the form of AC carrier amplification. This from the circuit itself limits its frequency characteristics, especially in high-frequency signal testing, the error will be greater (including the waveform distortion and amplitude