基于侧向耦合结构的准分布式光纤液漏传感器
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摘要
针对现有的准分布式光纤传感测量技术复杂、精度不高且响应时间较慢等问题,设计出一种实时性高且成本更低的准分布式光纤传感器。传感器主要由柔性LED灯带和带有侧向耦合结构的聚合物光纤组成。侧向耦合结构被LED逐一照亮,形成一系列传感单元。光通过侧向耦合结构入射聚合物光纤中,当LED和耦合结构之间的介质改变时,耦合光强增加,光纤两端输出光强随之增加,则可将液漏事件转化为耦合介质改变来测量。结果表明,准分布式光纤液漏传感器具有检测和定位漏水信号的能力且定位精度小于等于10cm,实现了液漏检测和漏点定位的功能。
In order to solve the problem that the existing quasi-distributed optical fiber sensing measurement technology is complex, the precision is not high and the response time is slow, a quasi-distributed optical fiber sensor structure with higher real-time performance and lower cost is designed. The sensor is mainly composed of a flexible LED strip and a polymer fiber with a side coupling structure. The side coupling structure is illuminated one by one by the LEDs to form a series of sensing probes. When the coupling medium changes from air to liquid, the lamp laterally couples the light into the polymer fiber through the side coupling structure, the coupling light intensity increases, and the pulse intensity detected by the optical power meters at both ends increases. The location of the leakage event can be obtained by the position of each pulse in its output sequence. At the same time, the effects of different side coupling structures on the coupled light intensity are studied. The results show that the quasi-distributed fiber optic sensor has the ability to detect and locate the water leakage signal, and the positioning accuracy is less than 10 cm.
In order to solve the problem that the existing quasi-distributed optical fiber sensing measurement technology is complex, the precision is not high and the response time is slow, a quasi-distributed optical fiber sensor structure with higher real-time performance and lower cost is designed. The sensor is mainly composed of a flexible LED strip and a polymer fiber with a side coupling structure. The side coupling structure is illuminated one by one by the LEDs to form a series of sensing probes. When the coupling medium changes from air to liquid, the lamp laterally couples the light into the polymer fiber through the side coupling structure, the coupling light intensity increases, and the pulse intensity detected by the optical power meters at both ends increases. The location of the leakage event can be obtained by the position of each pulse in its output sequence. At the same time, the effects of different side coupling structures on the coupled light intensity are studied. The results show that the quasi-distributed fiber optic sensor has the ability to detect and locate the water leakage signal, and the positioning accuracy is less than 10 cm.
引文
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[2] 薛花.油箱超声波测漏方法研究[D].北京:北京交通大学,2016:1—3.Xue Hua.Research on ultrasonic leak detection method of fuel tank [D].Beijing:Beijing Jiaotong University,2016:1—3.
[3] 马国,贾华东,卢长煜,等.磁粉检测与渗透检测在工程机械结构件无损检测中的应用[J].无损检测,2019,41(02):62—64.Ma Guo,Jia Huadong,Lu Changqi,et al.Application of magnetic particle detection and penetration detection in non-destructive testing of structural parts of engineering machinery[J].Non-destructive Testing,2019,41(02):62—64.
[4] 蒋青锋.基于涡流原理的易拉罐罐身焊缝缺陷在线检测研究[D].杭州:中国计量学院,2015:4—5.Jiang Qingfeng.On-line detection of weld seam defects in cans based on eddy current principle[D].Hangzhou:China Institute of Metrology,2015:4—5.
[5] 申林,侯东明,齐红元.油气储罐缺陷的声发射无损检测定位精度优化[J].石油与天然气化工,2019,48(01):104—108.Shen Lin,Hou Dongming,Qi Hongyuan.Optimization of localization accuracy of acoustic emission nondestructive testing for oil and gas storage tank defects[J].Petroleum and Natural Gas Chemical Industry,2019,48(01):104—108.
[6] 周欣晟,赵珊,陈育丽.漏磁检测管理方法探讨[J].化工管理,2016,34:98—100.Zhou Xinyu,Zhao Shan,Chen Yuli.Discussion on management method of magnetic flux leakage detection[J].Chemical Chemicals Management,2016,34:98—100.
[7] 侯钰龙.基于POF光纤宏弯效应的液漏液位传感关键技术研究 [D].太原:中北大学,2015:1—2.Hou Yulong.Key Technology of Liquid leakage and level sensing based on polymer optical fiber macro bending effect[D].Taiyuan:North University of China,2015:1—2.
[8] 张智娟,郭文翰,徐志钮,等.基于Φ-OTDR的光纤传感技术原理及其应用现状[J].半导体光电,2019,40(01):9—16.Zhang Zhijuan,Guo Wenhan,Xu Zhikou.Principle and application status of optical fiber sensing technology based on Φ-OTDR[J].Semiconductor Optoelectronics,2019,40(01):9—16.
[9] 王赵鹏.OFDR系统设计与关键技术研究[D].北京:北京邮电大学,2018:7—9.Wang Zhaopeng.Research on design and key technology of OFDR system [D].Beijing:Beijing University of Posts and Telecommunications,2018:7—9.
[10] 衣文索.基于法珀(F-P)光纤传感技术管道压力在线监测方法研究[J].长春大学学报,2015,25(6):1—4.Yi Wensuo.Study on pipeline pressure online monitoring method based on faber (f-p) optical fiber sensing technology[J].Journal of Changchun University,2015,25(6):1—4.
[11] 冯凯滨.基于相干光时域反射计的温度传感技术的研究[D].杭州:浙江大学,2016:18—30.Feng Kaibin.Research on temperature sensing technology based on coherent optical time domain reflectometer[D].Hangzhou:Zhejiang University,2016:18—30.
[12] 王大伟,封皓,杨洋,等.基于Ф-OTDR 光纤传感技术的供水管道泄漏辨识方法[J].仪器仪表学报,2017,38(4):830—837.Wang Dawei,Feng Wei,Yang Yang.Leakage identification method for water supply pipeline based on Ф-OTDR optical fiber sensing technology[J].Journal of Scientific Instrument,2017,38(4):830—837.
[13] Barrias A,Casas J R,Villalba S.A review of distributed optical fiber sensors for civil engineering applications[J].Sensors,2016,16(5):748.
[14] Yingzi Zhang,Yulong Hou,Yanjun Zhang.Continuous liquid level detection based on two parallel plastic optical fibers in a helical structure[J].Optical Engineering,2018,57(2):026112.
[15] Yingzi Zhang,Yulong Hou,Yanjun Zhang,et al.Cost-effective quasi-distributed liquid leakage sensor based on the polymer optical fiber and flexible lamp belt with LEDs[J].Opt.Express,2018,26(8):10158.