光栅法布里-珀罗腔干涉型水听器阵列中的时域串扰
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摘要
光栅法布里-珀罗腔干涉型水听器系统内的时域串扰严重限制了其实际应用,因此,对系统内时域串扰的产生机理进行分析,讨论在相位产生载波(PGC)解调方法下干涉信号的幅度对其相位信息的影响,并制作了两组不同反射率光栅水听器进行对比实验。实验表明,高反射率(R=0.6)光栅系统时分串扰明显,串扰信号在满足PGC解调能力的基础上其相位信息不会明显衰减;低反射率(R=0.02)光栅实现了34dB的串扰抑制。进一步研究发现,低反射率光栅系统中的串扰主要由前端水听器单元外加信号引起的多普勒效应噪声和时分串扰噪声组成。
Time domain crosstalk in fiber Bragg grating Fabry-Pérot(F-P)interferometric hydrophone array system limits its practical application seriously.So it is necessary to analyze the generating mechanism of time domain crosstalk.With the phase generator carrier(PGC)demodulation,the effect of amplitude on phase is discussed for the interference signal.Then two comparative hydrophone systems with different reflectivities of fiber Bragg grating are fabricated and tested.Experimental results show that amplitude of the crosstalk is high for the demodulation signal with high reflectivity of grating(R=0.6),because the phase of the crosstalk signal hardly reduces on the basis of the PGC demodulation.On the other hand,the crosstalk has about 34 dB suppression with the low reflectivity of grating(R=0.02).Furthermore,the crosstalk in low reflectivity grating system is verified to be composite of the Doppler noise of precedent hydrophones and time domain crosstalk.
Time domain crosstalk in fiber Bragg grating Fabry-Pérot(F-P)interferometric hydrophone array system limits its practical application seriously.So it is necessary to analyze the generating mechanism of time domain crosstalk.With the phase generator carrier(PGC)demodulation,the effect of amplitude on phase is discussed for the interference signal.Then two comparative hydrophone systems with different reflectivities of fiber Bragg grating are fabricated and tested.Experimental results show that amplitude of the crosstalk is high for the demodulation signal with high reflectivity of grating(R=0.6),because the phase of the crosstalk signal hardly reduces on the basis of the PGC demodulation.On the other hand,the crosstalk has about 34 dB suppression with the low reflectivity of grating(R=0.02).Furthermore,the crosstalk in low reflectivity grating system is verified to be composite of the Doppler noise of precedent hydrophones and time domain crosstalk.
引文
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2 Davis A R,Kirkendall C K,Dandridge A,et al..64channel all optical deployable acoustic array[C].12th International Conference on Optical Fiber Sensor,1997,16:OFA6.
3 Cranch G A,Nash P J,Kirkendall C K,et al..Large-scale remotely interrogated arrays of fiber-optic interferometric sensors for underwater acoustic applications[J].IEEE Sensors Journal,2003,3(1):16-30.
4 Kersey A D,Davis M A,Patrick H J,et al..Fiber grating sensor[J].Journal of Lightwave Technology,1997,15(8):1442-1463.
5 Cao Chunyan,Xiong Shuidong,Hu Zhengliang,et al..Noise analysis of repeaterless long-haul fiber-optic Hydrophone systems with the fiber length up to 200km[J].Acta Optica Sinica,2013,33(4):0406006.曹春燕,熊水东,胡正良,等.光纤水听器200km无中继传输系统噪声研究[J].光学学报,2013,33(4):0406006.
6 Wu Bingyan,Gao Kan,Chen Jingfeng,et al..Applications of fiber optic hydrophone array in water-way monitoring of the Huangpu river[J].Optical Fiber&Electric Cable,2015(2):27-30.吴昺炎,高侃,陈靖峰,等.光纤水听器阵列在黄浦江航道监测中的应用[J].光纤与电缆及其应用技术,2015(2):27-30.
7 Jin Mengqun,Zhang Zili,Wu Guojun,et al..A three dimensional vector hydrophone based on fiber-optic flexural disk accelerometer[J].Chinese J Lasers,2014,42(3):0305004.金梦群,张自丽,吴国军,等.基于光纤蝶型加速度传感单元的三维柱形矢量水听器[J].中国激光,2014,42(3):0305004.
8 Wang Wei,Li Dongming,Zhang Zili,et al..Suppression of transmission fiber induced noise in remotely optical fiber hydrophone system[J].Laser&Optoelectronics Progress,2015,51(11):110601.王巍,李东明,张自丽,等.远程光纤水听器系统中传输光纤引入噪声的抑制[J].激光与光电子学进展,2015,51(11):110601.
9 Morey W W,Meltz G,Glenn W H.Fiber optic Bragg grating sensors[C].SPIE,1989,1169:98-107.
10 Kirkendall C,Barock T,Tevten A,et al..Fiber optic towed arrays[R].NRL Review,2007:121-123.
11 Nakstad H,Kringlebotn J T.Realisation of a full-scale fiber optic ocean bottom seismic system[C].SPIE,2008,7004:700436.
12 Kersey A D,Dorsey K L.Crosstalk in a fiber-optic Fabry-Perot sensor array with ring reflectors[J].Optics Letters,1989,14(1):93-95.
13 Crancha G A,Flockhart G M H,Kirkendall C K.Efficient fiber Bragg grating and fiber Fabry-Perot sensor multiplexing scheme using a broadband pulsed mode-locked laser[J].Journal of Lightwave Technology,2005,23(1):3795-3806.
14 Waagaard O H,Ronnekleiv E.Reduction of crosstalk in inline sensor arrays using inverse scattering[C].SPIE,2008,7004:70044Z.
15 Lin H,Ma L,Hu Z,et al..Multiple reflection induced crosstalk in inline TDM fiber Fabry-Perot sensor system utilizing phase generated carrier scheme[J].Journal of Lightwave Technology,2013,31(16):2951-2958.
16 Kirkendall C K,Dandridge A.Overview of high performance fiber-optic sensing[J].Journal of Physics D:Applied Physics,2004,37(18):R197-R216.
17 Waagaard O H,Ronnekleiv E,Forbord S,et al..Suppression of cable induced noise in an interferometric sensor system[C].SPIE,2009,7503:75034Q.
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