光纤布拉格光栅传感器拉力和温度交叉关系的研究

The research of cross-sensitivity of strain and temperature in fiber Bragg grating sensors

在光纤光栅传感器的应用中,是由拉力还是由温度引起的波长测量值的变化是很难区分的。用定义拉力和温度的相关函数方法,把温度因素从波长与温度、拉力的交叉关系中分离出来,对光纤布拉格光栅的拉力和温度之间的相关特征进行理论研究,并用实验装置进行实验数据的测定。实验中,拉力在1 000～16 000με,温度在1～30℃之间时,相关函数项的实验数据与理论计算基本一致。这样,当光纤布拉格光栅(FBG)类型的传感器被应用于探测比较大的建筑物的结构形态时,温度和拉力之间的相互影响就可以用这种方法被估算出来。

The cross-sensitivity between strain and temperature always exsists in the application of fiber grating sensors,and it is not easy to distinguish the changes of the measured variables caused by strain and temperature.A novel method of correlation function for analyzing cross-sensitivity between strain and temperature is reported in this paper.Using the new method,the correlative characteristics between strain and temperature of fiber Bragg grating sensors are studied both theoretically and experimentally.The experimental results accord with the theoretical calculations.