基于拉曼散射测温原理，利用分布式光纤对UPVC（硬脂聚氯乙烯）和铸铁自来水管道进行模拟泄漏点定位实验。首先对采集到的原始Anti-Stokes光信号进行滤波平滑处理，再利用相关系数法对温度检测信号进行分类分析，识别自来水管有无泄漏发生，最后通过选择性阈值法识别出UVPC管以及铸铁管中的泄漏点位置。实验结果表明，该系统运行稳定且能够准确识别自来水管泄漏情况。选择性平均阈值法的使用，能够对200 m的埋地自来水管道准确地进行泄漏点的定位，定位误差为0.25 m～0.65 m。

Based on the principle of Raman scattering temperature measurement, a distributed optical fiber system was built to carry out the simulated leakage points location experiment of UPVC (unplasticized polyvinyl chloride) and cast-iron water pipes. Firstly, the original Anti-Stokes optical signal was filtered and smoothed. Then, the temperature measurement signal was classified and analyzed by using correlation coefficient method to identify whether the leakage occured in water pipes. Finally, the leakage points location in UVPC and cast-iron water pipes was identified by selective threshold method. The experimental results show that the distributed fiber optic system works stably and can accurately identify the leakage points of water pipes. The selective average threshold method can accurately locate the leakage points of 200 m underground water pipes and the location error ranges from 0.25 m to 0.65 m.