基于拉曼散射和光时域反射技术的结合,利用分布式光纤对自来水管道进行泄漏检测和定位模拟实验,分别在自来水管无泄漏和有微小泄漏的情况下,通过分布式光纤传感器获取温度检测信号。实验时,利用绝对距离法对温度检测信号进行聚类分析,识别聚乙烯(PE)自来水管有无泄漏发生,再对无泄漏信号利用选择性平均阈值法确定阈值信号,并通过检测信号和阈值信号的差值信号识别PE自来水管泄漏点位置。结果表明,该系统运行稳定,且能够准确识别自来水管泄漏情况,使用选择性平均阈值法能够准确定位泄漏点。

Based on the combination of Raman scattering and optical time domain reflection techniques, the distributed optical fiber is used for the simulation experiment of leakage detection and location of tap water pipes. The temperature detection signal is obtained under no leakage or slight leakage of a tap water pipe by a distributed optical fiber sensor. In the experiment, the absolute distance method is firstly used for clustering the temperature detection signals to identify whether there is leakage in the tap water pipe or not. Then, as for the no-leakage signals, a selective average threshold method is used for the determination of a threshold signal. Finally, the difference signal between the detection signal and the threshold signal is used for the identification of leakage location of a tap water pipe. The results show that the whole system is stable and can be used to accurately identify the leakage of tap water pipes. Moreover, the use of the selective average threshold method can accurately locate the leakage point.