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为解决光纤布拉格光栅(FBG)传感器温度和应力交叉敏感问题,研究了一种FBG双参数传感器。基于FBG测温、应力测量的基本原理,分析了FBG双参数传感器的工作原理。对设计的FBG双参数传感器进行了实验研究,得到了双参数传感器的温度及应力测量线性度及响应灵敏度,并给出了温度及应力两个参数共同作用下去除交叉敏感测量结果。测温光栅动态范围0℃~100℃,响应灵敏度为12.2pm/℃;封装后应力响应灵敏度为1.79pm/N。研究结果表明,在FBG应力测量过程中,该方法不仅可以有效去除温度交叉敏感问题,同时还可以实现温度及应力两种参数的准确测量。
In order to solve the problem of cross-sensitivity of temperature and stress in fiber Bragg grating (FBG) sensors, a FBG dual-parameter sensor was studied. Based on the principle of FBG temperature measurement and stress measurement, the working principle of FBG dual-parameter sensor is analyzed. The designed FBG dual-parameter sensor is studied experimentally, and the linearity and the response sensitivity of the two-parameter sensor are obtained. Temperature and stress are given to remove cross-sensitivity measurement results. The temperature range of the grating is 0 ℃ ~ 100 ℃ and the response sensitivity is 12.2pm / ℃. The stress response sensitivity after the package is 1.79pm / N. The results show that this method not only can effectively eliminate the temperature cross-sensitivity problem, but also can accurately measure the temperature and stress in the FBG stress measurement.