基于BOTDR光纤传感技术的光缆应变测量研究  

On-line strain monitoring research on optical cables with BOTDR sensing system

作　　者：郝蕴琦[1] 叶青 蔡海文 瞿荣辉 

机构地区：[1]郑州轻工业学院物理与电子工程学院,郑州450002 [2]中科院上海光学精密机械研究所空间激光信息技术研究中心,上海201800

出　　处：《激光杂志》2016年第3期88-91,共4页Laser Journal

基　　金：国家自然科学基金(31201377);郑州轻工业学院博士启动资金(2013BSJJ012;2014BSJJ086)

摘　　要：光缆线路应变监测对于通信系统的安全运行及预警等具有重要的意义。利用光缆内单模光纤中的自发布里渊散射,其频移和外界应变变化呈线性关系,构建布里渊光时域反射传感系统(BOTDR)。对长57m光缆施加拉力,利用BOTDR传感技术,对光缆所承受的拉力进行测量。随着拉力增加,光缆内布里渊频移增加,所测得光纤应变增加,多次测量具有重复性。BOTDR测量结果略小于光缆拉力试验机的测量结果,其误差为1.6%,这是由应力传递引起的。实验结果表明,BOTDR传感技术能够准确的、分布式的实现光缆沿线应变监测,可为通信光缆的机械性能监测供技术支持。Monitoring the strain distribution along the optical cables is important for safe operation and prewarning of communication system. With the spontaneous Brillouin scattering in the single-mode fiber within the cable, whose Brillouin frequency-shift is linear to the strain change, a BOTDR sensing system is constructed. On-line strain monitoring is made with the BOTDR system for 57m optical cable. The strain increases with extending the cable; and the results are repetitive for many experiments. Comparing with the cable tension instrument, the results are accordant, whose error is less than 1.6%. Experimental results show that the accuracy and distributed strain-monitoring of BOT- DR sensing system is feasible for the optical cable; and BOTDR is an effective method for mechanical properties monitoring.

关 键 词：光纤光学 应变监测 BOTDR光纤传感 

分 类 号：TN247[电子电信—物理电子学]