增强偏振光时域反射计灵敏度的光缆布设方案研究  

Enhancing the Sensitivity of Polarization Optical Time Domain Reflectometer through Designing the Layout Scheme of Optical Cable

作　　者：窦蓉蓉 张伦强 顾婧 张子敬 张元成 庄建军[1] DOU Rongrong;ZHANG Lunqiang;GU Jing;ZHANG Zijing;ZHANG Yuancheng;ZHUANG Jianjun(School of Electronic Science and Engineering,Nanjing University,Nanjing 210093,China;College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China)

机构地区：[1]南京大学电子科学与工程学院,南京210093 [2]南京大学现代工程与应用科学学院,南京210093

出　　处：《传感技术学报》2020年第4期479-484,共6页Chinese Journal of Sensors and Actuators

基　　金：国家级大学生创新创业训练计划项目(G201910284035);国家自然科学基金项目(61975076);江苏省重点研发计划项目(BE2018047)。

摘　　要：偏振光时域反射计(POTDR)通过探测光纤中光波偏振态的变化,可实现对光纤所受扰动的分布式测量,在周界安防领域有巨大的应用潜力。外界扰动在光纤上的作用方式对POTDR的灵敏度有重要的影响。在传统POTDR的基础上,研究了光缆的布线方式对传感系统灵敏度的影响,通过分析对比外界作用力与光纤感生双折射之间的关系,设计了两种可以提高POTDR传感灵敏度的布线方案。实验结果表明,以一般的平直式布线方式为对照,在同样的外界扰动影响下,本文提出的两种光缆布线方案,均可极大提高POTDR的传感灵敏度,对扰动事件的报警率从50%提高到了90%以上。Polarization Optical Time Domain Reflectometer(POTDR)can measure the perturbations along optical fiber in a distributed way by detecting the change of polarization of the backscattered light-waves in optical fibers.So it has great potential in the field of perimeter security.The acting ways of external perturbations on optical fiber has significant influence on the sensitivity of POTDR.This paper studies the influence of optical cable layout on the sensitivity of the traditional POTDR.By analyzing and comparing the relationship between external forces and induced birefringence,we design two optical cable layouts to improve the sensitivity of POTDR.Experimental results show that compared with conventional straight line layout,the proposed two layouts can greatly improve the sensitivity of POTDR,and the alarm rate of disturbance events can be improved from 50%to more than 90%.

关 键 词：光纤传感 偏振光时域反射计 灵敏度增强 扰动监测 布线方式 

分 类 号：TN253[电子电信—物理电子学] TH811[机械工程—仪器科学与技术]