电阻应变片原位温度补偿方法

Method of in-situ temperature compensation for resistance strain gauge

在应变测试时,为了消除温度变化对测试结果的影响,需采用温度补偿技术。当环境温度不均匀或温度变化范围大时,现有的温度补偿技术及应变片自补偿技术均无法使用。为此,通过对电阻应变片测试基本原理的分析研究,提出了电阻应变片原位温度补偿法,该方法利用测试的应变片自身进行温度补偿,可精确地消除温度对机械应变测试结果的影响。将原位温度补偿法应用于深冷环境下材料的力学性能试验研究,结果表明该方法可有效区分温度和力引起的变形,证明了该方法的有效性和合理性。

In order to eliminate the influence of temperature change on test results,temperature compensation technology must be adopted in strain test.In the case that the environment temperature is nonuniform or the temperature changes in a large range,the existing temperature compensation technology and the strain gauge self-compensation technology cannot be used.Therefore,the in-situ temperature compensation method for resistance strain gauge is put forward by analyzing and studying the basic principle of resistance strain gauge testing.In this method,the influence of temperature on mechanical strain test results can be eliminated precisely by temperature compensation of the gauge itself.The in-situ temperature compensation method is applied to the experimental study of the mechanical properties of materials in the cryogenic environment.The experimental results show that the method can effectively distinguish the deformation caused by temperature and force,which verifies the validity and rationality of the method.