Temperature characteristic of ring type dynamometer based on FBG sensors

In order to solve the problem that the measurement accuracy of FBG sensors used in the ring type dynamometer is vulnerable to be influenced by temperature fluctuations and others, a method for the temperature compensation of ring type dynamometer is necessary. A method that using wavelength multiplexed technology of fiber Bragg grating to test temperature and strain simultaneously has been proposed. This paper studies temperature characteristics of FBG sensors and annulus elastic body. Temperature calibration experiment which is used to obtain the temperature characteristic function of FBG sensors and annulus elastic body has also been done. Through the analysis of data, the temperature characteristic of ring type dynamometer has been obtained, and it owns good linearity. By using the temperature characteristic of ring type dynamometer, the effect of temperature fluctuation on the measurement accuracy can be compensated, which can enhance the cutting force measurement precision of ring type dynamometer.