应用于光纤复合架空地线的光纤分布式振动的测量  

Distributed Optical Fiber Vibration Sensing in Optical Fiber Composite Overhead Ground Wire

作　　者：苗春生 Miao Chunsheng(COOEC Subsea Technology Co., Ltd., Shenzhen, Guangdong 100027, China)

机构地区：[1]深圳海油工程水下技术有限公司,广东深圳100027

出　　处：《激光与光电子学进展》2018年第4期74-78,共5页Laser & Optoelectronics Progress

基　　金：山东省自然科学基金博士基金(ZR2016FB03);山东建筑大学博士基金(XNBS1535)

摘　　要：为了实现大范围的光纤复合架空地线(OPGW)舞动探测,提出了一种基于后向瑞利散射空间差分干涉的光纤分布式振动测量技术。舞动引起单模传感光纤中的后向瑞利散射光的变化,将含有振动信息的后向瑞利散射光注入到非平衡迈克耳孙干涉仪,利用干涉仪的臂长差实现相邻空间段的后向瑞利散射光干涉,采用3×3耦合器解调技术解调出相位信息,实现对振动信号的准确测量。在输电线路舞动实验室进行了OPGW的舞动测试,实现了0.9Hz舞动、2.3Hz非舞动的检测。We propose a distributed optical fiber vibration sensing scheme based on space difference interference of Rayleigh backscattering, to detect the swing of the optical fiber composite overhead ground wire （OPGW） over large areas. In this scheme, Rayleigh backscattered light with phase changes induced by the swing of the OPGW is split and fed into an imbalanced Michelson interferometer. We use the arm length difference of the interferometer to realize the Rayleigh backscattered light interference of adjacent space segments along the sensing fiber. The phase information is demodulated via 3 〉（ 3 coupler demodulation technology, and the accurate measurement of the vibration signal is realized. We achieve the swing at 0.9 Hz and non-swing at 2.3 Hz in the transmission line swing laboratory.

关 键 词：光纤光学 后向瑞利散射 空间差分干涉 非平衡迈克耳孙干涉仪 光纤复合架空地线 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术]