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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20m。
A novel Sagnac interferometer based bi-directional Sagnac distributed optical fiber sensor is proposed to detect and locate the perturbations on the sensing optical fiber lines. The composition and working principle of the distributed optical fiber sensing system are described. The disturbance signal is directly located in the time domain by using the adaptive time delay estimation method based on least mean square (LMS) algorithm. Theoretical analysis and test results show that the distributed optical fiber sensor can quickly and effectively detect and locate disturbing signals. The algorithm is simple and easy to implement, with high testing sensitivity and positioning accuracy, the maximum positioning error is less than 20m.