载波对分布式光纤泄漏检测系统的影响研究

Influence of carrier on distributed optical fiber leak detection systems

为了实时进行管道泄漏检测与定位,采用了能够长距离、动态检测泄漏信号的干涉式分布式光纤传感技术。分析了该干涉仪的泄漏检测原理、泄漏源定位方法,并通过实验研究了载波对传感器性能的影响。由实验结果可知,当1阶贝塞尔函数达到极值时,传感器性能最佳;而贝塞尔函数远离极值点时,无法实现信号检测。结果表明,选取较佳的载波参量,该传感器能够准确地确定泄漏源位置,且定位误差为0.99%。

To detect pipeline leakage and locate leakage point in real-time, a long distance distributed optical fiber sensor based on interferometer principle was introduced to detect leak signals dynamically. The measuring principle and the leaking source locating method for the detection system were analyzed, and an experiment was designed to study the influence of the carrier on the performance of the system. It is observed from the experiment results that the sensor can obtain optimal performance when the absolute value of one order Bessel is max; the leak signal can not be detected when the absolute value of one order Bessel is far less than the max. The results verify that the sensor can locate the leaking source accurately when the optimal carrier parameters are selected, and the positioning error is 0.99%.