基于DOFVS的新型压力输水管道泄漏在线监测方法  

Novel pressurized water pipe leak monitoring method based on the distributed optical fiber vibration sensor

作　　者：吴慧娟[1] 陈忠权 吕立冬 孙晓艳 孙振世[1] 

机构地区：[1]电子科技大学光纤传感与通信教育部重点实验室,成都611731 [2]全球能源互联网研究院,南京210003

出　　处：《仪器仪表学报》2017年第1期159-165,共7页Chinese Journal of Scientific Instrument

基　　金：国家自然基金委重大仪器专项(41527805);国家自然科学基金重大项目(61290312);青年基金(61301275);国家外专局和教育部111创新引智计划项目(B14039);光纤传感与通信教育部创新团队(PCSIRT;IRT1218);国家电网项目(00494067)资助

摘　　要：压力输水管道因内部压力及外部使用环境腐蚀等因素经常造成爆管泄漏等问题,根据管道泄漏时会引起泄漏点周围管壁振动这一特点,利用基于相位敏感光时域反射仪技术的分布式光纤振动传感技术(DOFVS)提出了一种新型压力输水管道光纤在线泄漏监测方法,此方法利用普通单模通信光纤拾取泄漏点引起的管道振动信号并进行实时检测和定位。在室内测试环境下,该系统能够检测出DN90 cm×EN2 cm普通钢制压力输水管道在0.4 Mpa压力下,泄漏孔径为4 mm的泄漏;在室外测试环境下,该系统能够检测出DN200 cm×EN2 cm普通钢制压力输水管道在0.27 Mpa压力下,泄漏量大于11 L/s泄漏孔的泄漏。此外,采用多尺度小波分解去噪方法,对监测信号中的环境噪声信号进行滤除,并取得了良好的去噪效果。Due to the internal pressure and other environmental effects,the pressurized water pipe has potential problems such as leakage and burst. Since there is a certain pressure in the pipe,the leakage point will cause the inner pipe walls to vibrate when the pipeline leaks. Thus in this paper,a new method is proposed to monitor the pressurized water pipe with a distributed optical fiber vibration sensor（ DOFVS） based on the phase-sensitive optical time-domain reflectometer. The indoor test results indicate that the proposed method can detect the aperture which is equal or larger than 4 mm for a steel pipe with DN91 cm × EN2 cm and 0. 4 Mpa inner pressure. The field measurement results show that,the leaking signal could be effectively acquired when the leakage rate is larger than 11 L / s,where the pipe is DN200 cm × EN2 cm steel made pressure pipe and the inside pipe pressure is around 0. 27 MPa. Besides,we adopt the wavelet threshold denoising method to effectively suppress the high frequency noises in the monitoring signal,and this method achieve good results.

关 键 词：压力输水管道 泄漏监测 相位敏感光时域反射仪 小波阈值去噪 

分 类 号：TH741.1[机械工程—光学工程]