基于光纤传感的地铁杂散电流监测方法

Monitoring Method of Metro Stray Current Based on an Optical Fiber Sensing Technique

为了解决目前基于极化电位监测的杂散电流监测方法存在的问题,提出了一种采用光纤传感技术的杂散电流监测新方法.根据基于法拉第效应的光纤电流传感技术的基本理论,搭建了光纤电流传感实验系统,并用电流发生器模拟待测电流对该监测方法进行了实验研究.结果表明:测量结果受双折射和温度变化的影响较大,采用特殊结构的光纤电流传感头和基于恒定磁场的比较测量方案能在一定程度上解决这一问题.运用传统的测量方案,传感头为螺旋缠绕时系统的线性度为±4.65%;采用比较测量方案,传感头为四角形和8字形结构时系统的线性度分别为±2.77%和±2.97%.基于光纤传感技术的杂散电流监测方法在地铁杂散电流的监测中是可行的.

A novel monitoring method with fiber current sensing technique was presented, which can solve the problems of nowadays method based on polarization potential testing. According to the theory of fiber current sensor based on Faraday effect, a fiber current sensing system was designed. The relative experiments with current generator simulating stray current were completed. The results indicate that the measurement was influenced by birefringenee and temperature change. The fiber current sensing head with special structure and comparative measuring method can solve this problem effectively. The linearity of conventional measuring system with spiral sensing head is ± 4. 65%, while those of comparative measuring system with quadrangular sensing head and 8-shape sensing head are 2.77% and ±2.97%, respective- ly. The fiber current sensing method is doable in stray current monitoring system.