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提出一种新的基于光纤光栅(FBG)技术的扭矩测量方法.分析了光纤光栅的传感机理,推导了扭矩与中心波长之间的数学关系,建立了双光纤光栅扭矩测量的理论模型.搭建实验平台,采用曲线拟合算法,对实测数据进行分析和处理,该扭矩测量系统的灵敏度达到22.89 pm/(N·m),最大非线性误差为0.23% FS,符合测量系统的误差要求,验证了此种扭矩测量方法的可行性.对温度补偿实验数据的分析表明:半桥式光纤光栅测量方案具有良好的温度补偿特性,能够补偿温度变化引入的测量误差,从而提高测量精度.
A new method of torque measurement based on fiber grating (FBG) technology is proposed.The sensing mechanism of FBG is analyzed, the mathematical relationship between torque and center wavelength is deduced, and the theoretical model of torque measurement of FBG is established. Experimental platform, the curve fitting algorithm is used to analyze and process the measured data. The sensitivity of the torque measuring system reaches 22.89 pm / (N · m) and the maximum nonlinearity error is 0.23% FS, which meets the error requirements of the measuring system. The feasibility of this kind of torque measurement method is analyzed.The experimental data of temperature compensation shows that the measurement scheme of half-bridge fiber grating has a good temperature compensation characteristic, which can compensate the measurement error introduced by temperature variation and improve the measurement accuracy.