光纤Bragg光栅高温传感技术研究

Research of High Temperature Sensing for Fiber Bragg Grating

从温度传感理论模型的角度研究了光纤Bragg光栅(FBG)的温度传感特性,推导了封装后的FBG温度传感器的温度响应灵敏度系数的解析式,分析了FBG的高温响应特性,提出了在高温环境中降低FBG的非线性响应效应的方法。实验结果表明,提高基体材料的热膨胀系数能有效降低FBG传感器在高温环境中的非线性的影响。

Based on a temperature sensing module of the fiber Bragg grating（FBG）, temperature sensing characteristics of in FBG were studied,and the analytical formulae of temperature effective linear sensitivity coefficients was deduced. Responce characteristics of FBG in high temperature were analyzed. The way to reduce non linear response in high temperature was proposed. The experimental result indicates that by improving thermal-expansion coefficients of encapsulation the non-linear response of FBG in high temperature can be reduced effectively.