基于光纤陀螺的有轨结构形变检测方法研究  

Research on Detection Method of Track Structure Deformation Based on Fiber Optic Gyroscope

作　　者：李长杰 苏州 甘维兵[2] LI Changjie;SU Zhou;GAN Weibing(Hubei Communications Investment Intelligent Testing Co., Ltd., Wuhan 430070, China;National Engineering Laboratory for Fiber Optic Sensing Technology,Wuhan University of Technology, Wuhan 430070, China)

机构地区：[1]湖北交投智能检测股份有限公司,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：《交通科技》2021年第2期15-19,共5页Transportation Science & Technology

基　　金：国家科技支撑计划(2014BAG07B00)资助。

摘　　要：光纤陀螺(FOG)属于高精度的光纤角速度传感器,将其应用于结构连续形变检测时,检测小车行驶轨迹的偏差易导致系统测量精度不高。文中提出一种基于FOG的有轨结构形变检测新方法,即在待测结构表面敷设一条轨道,通过测量轨道线形来反演待测结构形变,使得系统测量精度得到明显提高。将该方法用于长度为9.5m的模型桥测试,结果表明,光纤陀螺用于有轨结构形变检测精度达到0.5 mm;对于2 mm厚度的微小尺寸结构,其检测精度达到0.1 mm。Fiber Optic gyro(FOG)is a kind of high-precision fiber optic angular velocity sensor.When FOG is used to detect the continuous deformation of structure,the measuring precision of the system is not high because of the deviation of the vehicle track.In this paper,a new method based on FOG is proposed to detect the deformation of the track structure,that is,a track is laid on the surface of the structure to be measured,and the track alignment reflects the deformation of the structure to be measured,which improves the measurement accuracy of the system obviously.A 9.5 m model bridge is built in the laboratory,and the corresponding track is paved on its surface.The results show that FOG has good repeatability in deformation detection of track structure,and the precision of deformation measurement is 0.5 mm,while the precision is 0.1 mm for small size structure with 2 mm thickness.

关 键 词：光纤陀螺 有轨结构 连续形变 检测精度 

分 类 号：U446.3[建筑科学—桥梁与隧道工程]