提出了一种新型的基于Sagnac干涉仪的双向Sagnac分布式光纤传感器,可对传感光纤线路上的扰动进行检测与定位。阐述了该分布式光纤传感系统的组成和工作原理。利用基于最小均方(LMS)算法的自适应时延估计方法直接在时域上对扰动信号进行定位。理论分析和测试结果表明,该分布式光纤传感器能快速、有效地实现扰动信号的检测及定位。算法简单易实现,具有较高的测试灵敏度和定位精度,最大定位误差小于20 m。

A novel double Sagnac distributed fiber-optic sensor based on Sagnac interferometer for determining the position of disturbance along an optical fiber is presented. The configuration and operating principle of the system are illustrated,and the location principle and method for the detection system are analyzed. The system realizes the location of disturbances by using the adaptive time-delay estimation with the least mean square (LMS) algorithm in the time domain. Theoretical analysis and experimental results show that the proposed technology can realize the detection and location of the disturbed signal rapidly and effectively. This method is simple and can be obtained easily,and it has high measurement sensitivity and location precision. The maximm location error is less than 20 m.