基于分布式光纤测温的水管泄漏检测与定位

利用基于拉曼散射和光时域反射技术相结合的分布式光纤测温系统,对自来水管道进行泄漏检测和定位实验研究。分析了系统的温度分辨率和水管道泄漏时泄漏点处的温差情况。选取长200 m和700 m的传感光纤对水管道进行泄漏定位实验,并对检测信号进行小波变换分析处理,最后统计对比了检测系统的漏警率。实验结果表明,该系统运行稳定且能够准确识别管道泄漏情况并进行泄漏定位,定位误差≤1 m。

Detection andlocation of water pipeline leakage based on distributed fiber temperature measurement

A distributed fiber temperature measurement system based on Raman scatter and optical time domain reflecting(OTDR)is used to detect and locate the leakage of water pipeline.Firstly,the temperature resolution of the system and the temperature difference at the leakage point are analyzed.Secondly,the sensing fiber with the length of 200 m and 700 m are used to locate the leakage of water pipeline,and the detection signal is processed by wavelet transform.Finally,missing alarm rate(MAR) of the detection system is compared and calculated.The experimental results show that the distributed fiber temperature measurement system operation is stable and can identify the water pipe leakage,and the positioning error is less than or equal to 1 m.