基于Φ-OTDR的光纤准分布式氢泄漏监测  

Optical Fiber Quasi-distributed Hydrogen Leakage Monitoring Based onΦ-OTDR

作　　者：李树东 苏阳 何光层 朱珏佩 彭文英 宫贺 杨永济 巫涛江 吴德操 LI Shudong;SU Yang;HE Guangceng;ZHU Yupei;PENG Wenying;GONG He;YANG Yongji;WU Taojiang;WU Dechao(Baoshan Power Supply Bureau of Yunnan Power Grid Co. LTD., Baoshan 678002, China;Intelligent Fiber Sensing Technology of Chongqing Municipal Engineering Research Center of Institution of Higher Education, Chongqing Key Laboratory of Fiber Optic Sensor and Photodetector, Chongqing University of Technology, Chongqing 400054, China;Elevator Intelligent Operation and Maintenance of Chongqing Municipal Engineering Research Center of Institution of Higher Education, Chongqing 402260, China)

机构地区：[1]云南电网有限责任公司保山供电局,云南保山678002 [2]重庆理工大学智能光纤感知技术重庆市高校工程研究中心,重庆市光纤传感与光电检测重点实验室,重庆400054 [3]电梯智能运维重庆市高校工程中心,重庆402260

出　　处：《压电与声光》2020年第6期782-786,共5页Piezoelectrics & Acoustooptics

基　　金：重庆市教委基金资助项目(KJQN201905604);重庆市科技局技术创新与应用发展重点基金资助项目(cstc2019jscx-mbdxX0002)。

摘　　要：为了有效监测氢气管道的氢泄漏,该文提出了一种基于相位敏感光时域反射仪(Φ-OTDR)的准分布式氢泄漏实时在线监测系统。首先去除单模光纤包层,接着在去除包层的光纤表面采用化学镀膜法镀上对氢气敏感的钯膜,其次在钯膜表面涂上一层疏水溶胶,然后将涂覆有疏水溶胶的氢敏光纤安装在聚四氟乙烯槽中,最后采用Φ-OTDR分布式氢传感系统对氢气管道氢泄漏进行监测。结果表明,光纤Φ-OTDR分布式氢传感系统能准确地对氢气管道周界氢浓度的微小变化做出快速响应,响应时间为60 s,位置分辨率达到50 mm,氢气浓度检测下限达到1000×10-6。研究结果表明,基于光纤Φ-OTDR的测量系统能对长距离、大范围内的氢气管道氢泄漏进行准确检测。To effectively monitor the hydrogen leakage of hydrogen pipeline,a quasi-distributed real-time online hydrogen leakage monitoring system based on-OTDR is proposed in this paper.First,the cladding of the single-mode fiber was removed,and then the hydrogen-sensitive palladium film was coated on the surface of fiber without cladding by using the chemical coating method to response the hydrogen,thereafter,the hydrophobic sol was coated on the palladium film.Second,the hydrophobic sol coated fiber was installed in the PTFE channel.Finally,the hydrogen leak of the hydrogen pipeline was monitored by using theΦ-OTDR distributed hydrogen sensing system.The results show that the optical fiberΦ-OTDR distributed hydrogen sensing system can accurately respond to small changes in hydrogen concentration around the hydrogen pipeline.The response time was 60 s,the position resolution was 50 mm,and the lower limit of detection for hydrogen concentration was 1000×10-6.The research results show that the measurement system based on optical fiberΦ-OTDR can accurately detect hydrogen leaks in hydrogen pipelines over a long distance and large range.

关 键 词：相位敏感光时域反射仪(Φ-OTDR) 光纤 分布式检测 氢泄漏 氢敏钯膜 

分 类 号：TN252[电子电信—物理电子学]