基于全同弱反射光栅光纤的分布式传感研究
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摘要
利用弱反射光栅低反射率的特性,提出了基于全同弱布拉格反射光栅的分布式光纤传感方案。采用"光波长时域反射"解调技术,进行定位和解调,实现高密集度的准分布式传感。从理论上分析了光纤光栅反射率、光栅单元间隔以及传输损耗等对传感系统复用容量的影响。结果表明,这种方法可以有效提高光栅传感系统的复用容量,并降低信号解调成本。实验验证了该方案的可行性,系统复用了4个反射率为6%的光纤布拉格光栅(FBG),实现了单点、多点测量,温度测量的分辨力达到0.12℃。
By exploiting the low reflectivity of low-Bragg-reflective fiber grating,the distributed optical fiber sensing scheme based on identical-low-Bragg-reflective fiber gratings is proposed,theoretically analyzed and experimentally studied.The demodulation technology named "optical wavelength time-domain reflection",which utilizes the optical power variation of reflected sensing signal in both time domain and wavelength domain,is adopted.The influence of reflectivity of fiber grating,interval between adjacent gratings and transmission loss of delay fiber on the multiplexing capacity of the sensing system are also discussed.Results demonstrate that this sensing scheme can increase the multiplexing capacity of sensing system effectively,implement multi-point measurement and reduce the cost of signal demodulation.Experiments on this scheme are conducted to prove its feasibility.Four fiber Bragg gratings(FBG) with the reflectivity of 6% are multiplexed in this system,which agrees with the calculation result.The resolution of 0.12 ℃ for temperature measurement is obtained.
By exploiting the low reflectivity of low-Bragg-reflective fiber grating,the distributed optical fiber sensing scheme based on identical-low-Bragg-reflective fiber gratings is proposed,theoretically analyzed and experimentally studied.The demodulation technology named "optical wavelength time-domain reflection",which utilizes the optical power variation of reflected sensing signal in both time domain and wavelength domain,is adopted.The influence of reflectivity of fiber grating,interval between adjacent gratings and transmission loss of delay fiber on the multiplexing capacity of the sensing system are also discussed.Results demonstrate that this sensing scheme can increase the multiplexing capacity of sensing system effectively,implement multi-point measurement and reduce the cost of signal demodulation.Experiments on this scheme are conducted to prove its feasibility.Four fiber Bragg gratings(FBG) with the reflectivity of 6% are multiplexed in this system,which agrees with the calculation result.The resolution of 0.12 ℃ for temperature measurement is obtained.
引文
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11 Wang Yubao,Lan Haijun.Study of fiber Bragg grating sensor system based on wavelength-division multiplexing/ti me-division multiplexing[J].Acta Optica Sinica,2010,30(8):21962201王玉宝,兰海军.基于光纤布拉格光栅波/时分复用传感网络研究[J].光学学报,2010,30(8):21962201
12 X.Wan,H.F.Taylor.Multiplexing of FBGsensors using modelocked wavelength-swept fibre laser[J].Electron.Lett.,2003,39(21):15121514
13 L.C.G.Valente,A.M.B.Braga,A.S.Riberioet al..Combined ti me and wavelength multiplexing technique of opticalfiber grating sensor arrays using commercial OTDRequipment[J].IEEE Sensors Journal,2003,3(1):3135
2 Qiao Xueguang,Ding Feng,Jia Zhenanet al..High precision optical fiber Bragg grating demodulation systembased on thesource filtering for seismic detection[J].Acta Optica Sinica,2010,30(8):22192223乔学光,丁锋,贾振安等.基于光源滤波的高精度光纤光栅地震检波解调系统[J].光学学报,2010,30(8):22192223
3 Zhang Xiaoli,Liang Dakai,Lu Jiyunet al..Ahigh reliabile optic fiber Bragg grating sensor network design[J].Chinese J.Lasers,2011,38(1):15张晓丽,梁大开,芦吉云等.高可靠光纤布拉格光栅传感器网络设计[J].中国激光,2011,38(1):15
4 A.D.Kersey,M.A.Davis,H.J.Patricket al..Fiber grating sensors[J].J.Light wave Technol.,1997,15(8):14421462
5 Kenneth O.Hill,Gerald Meltz.Fiber Bragg grating technology fundamentals and overview[J].J.Light wave Technol.,1997,15(8):12631276
6 Liu Deming,Sun Qizhen.Distributed optical fiber sensing technology and its applications[J].Laser&OptoelectronicsProgress.2009,46(11):2933刘德明,孙琪真.分布式光纤传感技术及其应用[J].激光与光电子学进展,2009,46(11):2933
7 Jiang Desheng,Fan Dian,Mei Jiachunet al..Multiplexing/demultiplexing technology based on fiber Bragg grating sensors[J].Laser&Optoelectronics Progress.2005,42(4):1428姜德生,范典,梅加纯等.基于FBG传感器的分复用技术[J].激光与光电子学进展,2005,42(4):1428
8 S.Abad,F.M.Araujo,L.A.Ferreiraet al..Comparative analysis of wavelength-multiplexed photonic-sensor networksusing fused biconical WDMs[J].IEEE Sensors Journal,2003,3(4):475483
9 D.C.Norman,D.J.Webb,R.D.Pechstedtet al..Extended rangeinterrogation of wavelength division multiplexed fibreBragg grating sensors using arrayed waveguide grating[J].Electron.Lett.,2003,39(24):17141716
10 Y.Sano,T.Yoshino.Fast optical wavelengthinterrogator employing arrayed waveguide grating for distributed fiber Bragggrating sensors[J].J.Light wave Technol.,2003,21(1):132139
11 Wang Yubao,Lan Haijun.Study of fiber Bragg grating sensor system based on wavelength-division multiplexing/ti me-division multiplexing[J].Acta Optica Sinica,2010,30(8):21962201王玉宝,兰海军.基于光纤布拉格光栅波/时分复用传感网络研究[J].光学学报,2010,30(8):21962201
12 X.Wan,H.F.Taylor.Multiplexing of FBGsensors using modelocked wavelength-swept fibre laser[J].Electron.Lett.,2003,39(21):15121514
13 L.C.G.Valente,A.M.B.Braga,A.S.Riberioet al..Combined ti me and wavelength multiplexing technique of opticalfiber grating sensor arrays using commercial OTDRequipment[J].IEEE Sensors Journal,2003,3(1):3135
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