基于频域反射的分布式光纤传感变形重构研究  

Research on deformation reconstruction of distributed optical fiber sensing based on frequency domain reflection

作　　者：谭明享 张东生[2] TAN Mingxiang;ZHANG Dongsheng(School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430070,China;National Engineering Laboratory of Fiber Optical Sensing Technology,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学机电工程学院,武汉430070 [2]武汉理工大学光纤传感技术国家工程实验室,武汉430070

出　　处：《光通信技术》2021年第12期17-20,共4页Optical Communication Technology

摘　　要：为了对变压器绕组、翼面和桥梁等设备或工程结构的变形进行监测,利用基于光频域反射(OFDR)的分布式光纤传感系统研究变形重构问题。首先介绍了应变与曲率之间的转换关系,然后推导基于切角递推算法的曲线变形重构公式,并在切角递推法的基础上提出了改进重构算法。实验时OFDR应变测量系统空间分辨率设置为2 cm,集中力加载在简支梁中间,当集中载荷为11.76 N时,最大变形达到40 mm;消除系统误差后,切角递推法最大误差为0.667 mm,改进重构算法最大误差为0.59 mm。In order to monitor the deformation of transformer windings,wings,bridges and other equipment or engineering structures,the distributed optical fiber sensing system based on optical frequency domain reflection(OFDR)is used to study deformation reconstruction in this paper.Firstly,the transformation relationship between strain and curvature is introduced,and then the curve deformation reconstruction based on tangent recursive algorithm is deduced,and the improvement of reconstruction algorithm is proposed on the basis of tangent recursive algorithm.In the experiment,the spatial resolution of OFDR strain measurement system is set to 2 cm,and the concentrated force is loaded in the middle of the simple beam.When the concentrated load is 11.76 N,the maximum deformation reaches 40 mm.After eliminating the system error,the maximum error of the tangent recursive algorithm is 0.667 mm,and the maximum error of the improved reconstruction algorithm is 0.59 mm.

关 键 词：光纤传感 光频域反射 瑞利散射 简支梁 变形重构 

分 类 号：TH74[机械工程—光学工程]