偏振态对分布式光纤泄漏检测系统的影响研究

研制了一种基于Sagnac干涉仪的直线型分布式光纤传感器,可实时进行管道泄漏检测与定位。分析和研究了该干涉仪的泄漏检测原理、泄漏源定位方法以及光偏振态对传感器性能的影响。当两束光偏振态相同时,系统具有最佳的性能;当两束光正交时,无法实现信号检测。管道泄漏的实验结果表明,该系统能较准确地确定泄漏源位置,且定位误差为0.69%。

Influence of polarization state on distributed optical fiber leak detection system

An in-line distributed optical fiber sensor based on the principle of Sagnac interferometer is developed,and it is used to detect pipeline leakage and locate leakage point in real-time.The measuring principle and the leaking source location method for the detection system are analyzed,and the influence of the polarization of the light on the performance of the system is researched.The system can obtain optimal performance when the polarization angle between the two beams is the same;the leak signal can not be detected when the two beams are orthogonal.An experiment is designed to detect leaking source and locate leaking source.The results verify that the system can locate leaking source accurately and the error is 0.69%.