相干自外差布里渊光纤传感系统设计及性能分析  

Scheme Design and Performance Analysis of Coherent Self-Heterodyne Brillouin Fiber Sensing System

作　　者：李永倩[1] 程效伟[2] 李旭东[1] 

机构地区：[1]华北电力大学电子与通信工程系,河北保定071003 [2]张家口供电公司,河北张家口075000

出　　处：《电子器件》2008年第3期752-755,共4页Chinese Journal of Electron Devices

基　　金：863计划资助(2006AA09Z141);教育部留学回国人员科研基金资助(教外司留[2005]383号);华北电力大学留学回国人员科研基金资助(20041401)

摘　　要：设计了一个外差检测式布里渊光纤传感系统,采用逐步调节微波本振信号与布里渊电信号相外差的方法,实现了布里渊信号的频移和强度的同时测定,从而实现光纤温度和应变的同时测量。最终实现了10km传感距离1m的空间分辨率的基础上,0.5K的温度分辨率和10.5με的应变分辨率。Based on adjusting local microwave oscillation signal step-by-step and having a heterodyne with Brillouin electrical signal, a heterodyne detection Brillouin fiber sensing system is designed. It can measure Brillouin shift and intensity synchronously, so temperature and strain of fiber are measured synchronously. Based on a 10 km sensing fiber, temperature resolution of 0. 5 K and strain resolution of 10. 5με is achieved with a spatial resolution of 1 m.

关 键 词：分布式光纤传感 外差检测 信噪比 温度和应变分辨率 空间分辨率 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]