基于双材料悬臂梁的光纤光栅应力与温度传感器

FBG strain and temperature sensor based on double-material cantilever beam

设计了一种新型的悬臂梁结构,采用单根光纤Bragg光栅(FBG)实现温度和应力同时测量的传感器方案。传感器使用了由两种有机聚合物材料加工成的等强度悬臂梁,解决了FBG应用于压力和温度测量时的交叉敏感问题。传感器在压力和温度同时作用下,FBG反射谱分裂成双峰结构,通过测量反射谱中的双峰峰值波长达到温度与应力同时测量的目的。实验验证了该方案的可行性,且测量结果具有良好的线性,获得了光栅应力和温度响应系数分别为0.001 81 nm/g和0.04 nm/℃。

A new type of cantilever beam structure which consists of two kinds of polymeters is designed,using single fiber Bragg grating（FBG） to achieve simultaneous measurement of temperature and strain.This sensor used the equal strength cantilever beam with two kinds of polymer materials,which can solve the cross-sensitive issue of pressure and temperature measurement.When the sensor is simultaneously influenced by pressure and temperature,the reflection spectrum of the fiber Bragg grating is split into two peaks,so the temperature and strain can be simultaneously measured by the two peak wavelengths.The experiments demonstrated the feasibility of the scheme,and the measurement results have good linearity,and the sensitivities of strain and temperature are 0.001 81 nm/g and 0.04 nm/℃ respectively.