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针对目前许多新型光纤有效弹光系数测量的需要,报导了用光纤布喇格光栅(FBG)传感器测量光纤有效弹光系数的新方法。用一个温度参考光栅、一个测量光栅和一已知膨胀系数的材料,结合光纤布喇格光栅的特有性质进行了测量。建立了实验系统,实验结果表明,系统可以有效地解决温度与应变对光栅存在交叉敏感的问题,成功地测出了光纤有效弹光系数,测量误差小于1.3%。
In response to the needs of many new types of fiber effective anomaly measurement, a new method for measuring the effective fiber-optic elastic coefficient with fiber Bragg grating (FBG) sensors is reported. A temperature reference grating, a measuring grating and a material of known expansion coefficient were combined with the unique properties of fiber Bragg gratings. The experimental system is established. The experimental results show that the system can effectively solve the problem of temperature and strain cross-sensitivity to the grating. The effective fiber-optic elastic coefficient has been successfully measured and the measurement error is less than 1.3%.