双路扰动与温度同时监测的光纤传感技术研究
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摘要
从油气管道沿线需要进行外部入侵及泄露监测的安全需求出发,在多年分布式光纤扰动传感技术研究的基础上,结合拉曼散射理论,设计了一种简化的双路光纤传感结构以实现扰动与温度双参数的同时监测,该方案既可提高现有系统器件的利用率,又相比于单路传感,避免了脉冲光源的复杂调制,同时也消除了拉曼光和瑞利光之间可能的相互影响,实验结果表明,在4. 9 km的光纤上实现了对扰动与温度的异常监测及定位报警,定位误差不超过20 m。
For oil and gas pipelines,both external intrusion and leakage need to be monitored. After many years research on distributed optical fiber intrusion sensing technology,a simplified two-path optical fiber sensing structure was designed to monitor parameters of intrusion and temperature simultaneously,based on Rayleigh and Raman light scattering theory. The scheme could improve the utilization of the existing system components,and avoid complex modulation of the pulse light source compared with the single-path sensing,and it also reduced the possibility of mutual influence between the Raman light and the Rayleigh light. Experimental results show that over the fiber of 4. 9 km,the temperature measurement accuracy is intrinsic ±4 ℃ with the same spatial resolution of 20 m as that of intrusion monitoring.
For oil and gas pipelines,both external intrusion and leakage need to be monitored. After many years research on distributed optical fiber intrusion sensing technology,a simplified two-path optical fiber sensing structure was designed to monitor parameters of intrusion and temperature simultaneously,based on Rayleigh and Raman light scattering theory. The scheme could improve the utilization of the existing system components,and avoid complex modulation of the pulse light source compared with the single-path sensing,and it also reduced the possibility of mutual influence between the Raman light and the Rayleigh light. Experimental results show that over the fiber of 4. 9 km,the temperature measurement accuracy is intrinsic ±4 ℃ with the same spatial resolution of 20 m as that of intrusion monitoring.
引文
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[17]龙青云,吴庭万,邓华秋.光纤拉曼放大器中拉曼阀值的理论分析[J].华南理工大学学报(自然科学版),2006,34(1):35-38.
[2] PENG F,CAO X.A hybridΦ/B-OTDR for simultaneous vibration and strain measurement[J]. Photon. Sens. 2016,6,121-126.
[3] ZHANG X,HU J,ZHANG Y.A Hybrid Single-End-Access BOTDA and COTDR Sensing System Using Heterodyne Detection[J].Lightwave Technol. 2013,31,1954-1959.
[4] MASOUDI A,NEWSON T P.Cont-ributd Review:Distributed optical fibre dynamic strain sensing[J]. Rev. Sci. Instrum,2016,87,011501.
[5] KURASHIMA T,HORIGUCHI T,IZUMITA H,et al.Brillouin optical-fiber time domain reflectometry[J]. IEICE Transactions on Communi-cations,1993,76(4):382-390.
[6] BUTTERAND C D,HOCKER G B.Fiber optics strain gauge[J]. Appl.Opt. 1978,17(18):2867-2869.
[7] RAO Y J,HENDERSON P J,JACKSON D A,et al. Simultaneous strain,temperature and vibration measurement using a multiplexed in-fibre-Brag-grating/fibre-Fabry-Perot sensor system[J]. ELECTRONICS LETTERS,1997,33(24):2063-2064.
[8]曾祥楷,饶云江,余般梅,等.光纤应变、温度、振动同时测量新技术的研究[J].光子学报. 2001,30(10):1254-1258.
[9]周进.多参数分布式光纤传感系统关键技术研究[D].重庆:重庆大学光电工程学院,2015.
[10]白清,王云才,刘昕,等.基于分布式光纤的温度、振动、声音、应变的监测技术与实现[J].激光杂志,2018,39(3):47-48.
[11] PERSONIK S D. Photon probe-an optical fiber time-domain reflectom-eter[J]. Bell syst.TECK,1977,56(3):355-366.
[12]耿军平.全分布式光纤传感器系统研究[D].西安:西北工业大学,2002.
[13] DAKIN J P. Distributed Optical fiber Raman Temperature Sensor using a Semiconductor light source and detector[J],Electronics Letters,1985,21(13):569-570.
[14] DAKIN J P. Temperature distributio-n measurement using Raman ratio thermometry[J],SPIE,1985,566:249-253.
[15] OGAWA K.A fiber optical distrib-uted temperature sensor with high distance resolution[J]. Springer Proceedings in Physics,1989,44:544-551
[16] CULSHAW B,DAKIN J. Optical Fiber Sensors[M]. Boston and London:Artech House,1989.
[17]龙青云,吴庭万,邓华秋.光纤拉曼放大器中拉曼阀值的理论分析[J].华南理工大学学报(自然科学版),2006,34(1):35-38.