光纤光栅高温应变测量及工作温区调控方法  

High Temperature Strain Measurement and Working Temperature Zone Regulation Method of Fiber Bragg Grating

作　　者：刘繄[1] 李志强 谭跃刚[1] 杨彩霞 管昕 郭煜恩 LIU Yi;LI Zhiqiang;TAN Yuegang;YANG Caixia;GUAN Xin;GUO Yu’en(School of Mechnaical Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《压电与声光》2023年第4期579-583,共5页Piezoelectrics & Acoustooptics

基　　金：国家重大科技专项基金资助项目(2017-V-0003-0052)。

摘　　要：光纤光栅由于自身材料限制,当测量500℃以上高温应变时,基底材料的热膨胀通常会导致光纤光栅断裂,因而在高温环境中光纤光栅的应用受限。为解决此问题,该文提出了一种为光纤光栅提供冗余光纤高温应变测量思路,探索了冗余光纤的控制方法及工艺。通过搭建测试高温应变实验平台,对冗余光纤控制方法进行了实验验证。实验结果表明,此方法封装的光纤光栅可实现500~1000℃下应变测量,进行应变测量时表现出良好的线性特性,相关系数超过0.999,应变灵敏度为1.44 pm/με,与常温下光纤光栅性能相同。该方法操作简单,具有可重复性,极大地提高了光纤光栅的高温应变测量范围,具有良好的应用前景。Due to the material limitations,when measuring high-temperature strain above 500℃,the thermal expansion of substrate materials usually causes fracture of,so the applications of fiber Bragg grating in high-temperature environment is limited.In order to address this problem,a high temperature strain measurement idea of providing redundant fiber for fiber Bragg grating is proposed,and the control method and technology of redundant fiber are explored.By setting up a high temperature strain test platform,the redundant optical fiber control method is verified by experiments.The experimental results show that the fiber Bragg grating encapsulated by this method can realize strain measurement at 500~1000℃,and shows good linearity during strain measurement,the correlation coefficient is over 0.999,and the strain sensitivity is 1.44 pm/με.The redundant fiber has the same performance as that at room temperature.The method is simple and reproducible,which greatly improves the range of high temperature strain measurement of fiber grating,and has a good application prospects.

关 键 词：光纤光栅 冗余光纤 高温 应变 工作温区调控 

分 类 号：TN384[电子电信—物理电子学]