基于光纤传感和小波变换的管道泄漏定位技术

研究了一种基于Sagnac光纤干涉仪原理的分布式光纤管道泄漏检测和定位技术,利用单模光纤作为分布式传感器,可以有效地检测管道沿线所发生的泄漏信息,并实现泄漏点定位。阐述了检测系统的组成和工作原理,分析了检测系统定位方法。采用小波阈值消噪对泄漏信号进行处理,可以有效地提高零点频率的辨识性。结果表明:该检测技术具有较高的测试灵敏度和定位精度。

Technology of pipeline leakage location based on optical fiber sensing and wavelet transforms

A distributed optical fiber pipeline leakage detection and location technology based on Sagnac optical fiber interferometer is studied. The single mode optical fiber is used to build up the distributed sensor, the leak signals can be detected efficiently, and the leak positions can be located. The principle and the result of the detection system are introduced, and location method is also analyzed. The wavelet threshold denoising method is used to analyze the leak signals, and the identification of the null spectrum can be improved effectively. The results verify that the detection technology has high measurement sensitivity and location precision.