一种温度自补偿的高灵敏度光纤光栅应变传感器

High sensitivity FBG strain sensor with temperature compensation

针对光纤光栅(FBG)应变传感器对应变和温度同时敏感的问题,基于FBG传感原理以及环形结构受力变形特点,提出了一种圆环式的FBG应变传感器,并进行了理论分析和传感器性能实验。传感器的敏感结构是圆环,通过将光栅粘贴在圆环竖向和横向直径方向,实现对被监测对象表面的应变监测。实验结果表明,传感器的应变灵敏度为3.76pm/με,线性相关度可达0.999 9,且温度影响几乎被消除,可适用于受温度影响和精度要求较高的场所,尤其是冶金铸造起重机的监测。

Aiming at both strain and temperature sensitivity problem of fiber Bragg grating （FBG） strain sensor, this paper presents an FBG strain sensor based on circular ring with stress deformation principle of structure, and the theoretical analysis and sensor performance test are conducted. The circular ring is the sensitive structure of the strain sensor. We can achieve the surface strain of the monitored target by pasting the FBG at the ring vertical and transverse diameters. A series of optical fiber sensing experi- mental results show that the sensitivity of our prepared sensor is 3.76 pm/με with linearity of 0. 999 9, and the affection of temperature is almost eliminated. It can be applied to strain monitoring with high precision demand and high temperature effect, especially for metallurgy casting crane.