基于Ф-OTDR和POTDR结合的分布式光纤微扰传感系统  

A Distributed Optical Fiber Perturbation Sensor System Base on Combination of ф-OTDR and POTDR

作　　者：李建中[1] 饶云江[1,2] 冉曾令[1] 谢孔利[1] 

机构地区：[1]电子科技大学宽带光纤传输与通信网技术教育部重点实验室,成都610054 [2]重庆大学光电技术与系统教育部重点实验室,重庆400014

出　　处：《光子学报》2009年第5期1108-1113,共6页Acta Photonica Sinica

基　　金：教育部博士点基金(A0901010120060614017)资助

摘　　要：提出了一种ф-OTDR和POTDR相结合的分布式光纤微扰传感系统.该系统将窄线宽DFB激光器作为传感光源同时应用到ф-OTDR和POTDR中,在不增加成本的前提下使两种系统合为一体,可同时检测传输光脉冲的相位和偏振态的变化,并使它们并行运行以提高传感系统对微扰远程定位检测的准确度,从而大幅减小误判率和漏报率.同时采用小波分析的方法来降低传感信号的噪音以进行后续的处理.实验结果表明,传感系统在14km处获得具有较高信噪比的扰动信号,同时系统的空间分辨率也达到了50m.A distributed optical fiber perturbation sensing system, based on the combination of phasesensitive optical time-domain reflectometer （4 OTDR） and polarization optical time domain reflectometer （POTDR）, was demonstrated for optical fiber link surveillance. A DFB laser with narrow linewidth was used as the common optical light source for both Ф-OTDR and POTDR which work together to detect the phase and polarization perturbations of the returned light pulses. Such an approach can keep the system cost low and enhance the detection accuracy of perturbations and hence reduce the error rate simultaneously. And, the wavelet transform method was adopted to denoise the sensing data for further signal processing. Experimental results show that a high SNR of the sensor signal at 14 km along the fiber link with a spatial resolution of 50 m can be achieved.

关 键 词：分布式光纤传感 相位敏感光时域反射计 偏振光时域反射计 小波变换 光缆监测 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置] TN911.7[自动化与计算机技术—控制科学与工程]