基于双金属膜片结构的海底地震勘探光纤加速度传感器研究
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摘要
针对全光海底地震检波器技术的特殊应用需求,设计了一种基于双金属矩形膜片的缠绕式光纤加速度传感器。利用弹性力学理论对光纤加速度传感器的加速度灵敏度和一阶共振频率的特性进行了分析,制作了光纤加速度传感器样品并对其性能进行了测试。结果表明,本文加速度传感器的灵敏度为45dB re∶0dB=1rad/g,一阶共振频率在820Hz左右,与理论分析值很好吻合。在10～400Hz工作带宽中,交叉去敏度约为30dB。测试系统中,使用的相位生成载波(PGC)解调算法的最小相位检测精度为10-5 rad/Hz1/2,因此理论能探测的最小加速度信号为56ng/Hz1/2。由于采用全金属结构,本文类型光纤加速度传感器能够更好地满足海底永久布放检波器的特殊要求。
In this paper,we present a double-metal rectangular diaphragm based fiber optic accelerometer for seabed seismic detection application.We analyze sensitivity and resonance frequency of this sensor by way of mechanics of elasticity.The results show that the accelerometer can achieve an axis sensitivity of 45 dB re∶0 dB=1 rad/g,a cross sensitivity of about 30 dB between 10 Hz and 400 Hz,and the resonance frequency of about 820 Hz,which agree well with the theoretical analysis.In this system,the minimum measurable demodulation phase of the phase-generated carrier(PGC) is 10-5 rad/Hz1/2,and the minimum acceleration reaches 56 ng/Hz1/2 theoretically.With an all-metal structure,this type of accelerometer can better adapt to the special requirements of permanent deep seabed geophone.
In this paper,we present a double-metal rectangular diaphragm based fiber optic accelerometer for seabed seismic detection application.We analyze sensitivity and resonance frequency of this sensor by way of mechanics of elasticity.The results show that the accelerometer can achieve an axis sensitivity of 45 dB re∶0 dB=1 rad/g,a cross sensitivity of about 30 dB between 10 Hz and 400 Hz,and the resonance frequency of about 820 Hz,which agree well with the theoretical analysis.In this system,the minimum measurable demodulation phase of the phase-generated carrier(PGC) is 10-5 rad/Hz1/2,and the minimum acceleration reaches 56 ng/Hz1/2 theoretically.With an all-metal structure,this type of accelerometer can better adapt to the special requirements of permanent deep seabed geophone.
引文
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[18]KANG Chong,LIU Jia-jie,HUANG Zong-jun,et al.Phasegenerated carrier demodulation algorithmfor F-P opticalfiber vector hydrophone array[J].Journal of Optoelec-tronics.Lasers,2011,22(1):52-55.康崇,刘佳杰,黄宗军,等.F-P型同振式光纤矢量水听器相位产生载波解调算法[J].光电子.激光,2011,22(1):52-55.
[19]WANG Lin,HE Jun,LI Fang,et al.Ultra Low frequencyphase generated carrier demodulation technique for fibersensors[J].Chinese Journal of Lasers,2011,38(4):1-6.王林,何俊,李芳,等.用于探测极低频信号的光纤传感器相位生成载波解调方法[J].中国激光,2011,38(4):1-6.
[20]SUN Xun-fang,FANG Xiao-shu,GUAN Lai-tai.Mechanicsof materials(II)[M].Fourth Edition.Beijing:Higher Edu-cation Press,2002,54-64.孙训方,方孝淑,关来泰.材料力学(II)[M].第4版.北京:高等教育出版社,2002,54-64.
[2]Gaiser J E,Vasconcelos I.Elastic interferometry for oceanbottom cable data:theory and examples[J].GeophysicalProspecting,2010,58(3):347-360.
[3]Brown R J.Acquisition footprints and seafloor coupling inmulticomponent OBC seismic data[J].Geophysics,2010,75(1):Q11-Q20.
[4]LI Xue-cheng,LIU Su,ZHANG Wen-tao,et al.Study onlow-frequency characteristic of double-diaphragm fiberBragg grating geophone[J].Journal of Optoelectronics.Lasers,2010,21(4):529-532.李学成,刘肃,张文涛,等.双膜片结构光纤光栅地震检波器低频特性的研究[J].光电子.激光,2010,21(4):529-532.
[5]WANG Jian-fei,LUO Hong,ZHOU Meng,et al.Experimen-tal research of an all-polarization-maintaining optical fib-erVector hydrophone[J].Journal of Lightwave Technolo-gy,2012,30(8):1178-1184.
[6]LIN Qiao,CHEN Liu-hua,LI Shu,et al.Fiber optic acceler-ometer based on fiber-mirror interference cavity[J].Op-tics and Precision Engineering,2011,19(6):1180-1183.林巧,陈柳华,李书,等.基于光纤-镜面干涉腔的光纤加速度计[J].光学精密工程,2011,19(6):1180-1183.
[7]LI Lan,DONG Xin-yong,ZHAO Chun-liu,et al.A tempera-ture-independent fiber Bragg grating accelerometer[J].Journal of Optoelectronics.Lasers,2010,21(11):1618-1620.李岚,董新永,赵春柳,等.一种对温度不敏感的光纤布拉格光栅加速度计[J].光电子.激光,2010,21(11):1618-1620.
[8]PENG Feng,YANG Jun,WU Bing,et al.Compact fiber op-tic accelerometer[J].Chinese Optics Letters,2012,10(1):1-3.
[9]Moro E A,Todd M D,Puckett A.A performance compari-son of transducer designs for interferometric fiber opticaccelerometers[A].SPIE[C],2010,7648:76480G-1-6480G-12.
[10]WANG Yong-jie,XIAO Hao,ZHANG Song-wei,et al.De-sign of a fibre-optic disc accelerometer:theory and ex-periment[J].Measurement Science and Technology,2007,18(6):1763-1767.
[11]WANG Yong-jie,LI Fang,XIAO Hao,et al.Sensitivity cal-culation of disk-type fiber optic sensor[J].Acta OpticaSinica,2007,27(8):1389-1392.第8期蒋东山等:基于双金属膜片结构的海底地震勘探光纤加速度传感器研究.1441.王永杰,李芳,肖浩,等.盘片式光纤传感器灵敏度计算方法[J].光学学报,2007,27(8):1389-1392.
[12]Cranch G A,Nash P J.High responsivity fiber-optic flex-ural disk accelerometers[J].Journal of Lightwave Tech-nology,2000,18(9):1233-1243.
[13]WANG Jian-fei,LUO Hong,XIONG Shui-dong,et al.De-velopment of three-component all polarization-maintainingoptical fiber vector hydrophone[J].Journal of Optoelec-tronics.Lasers,2011,22(12):1784-1788.王建飞,罗洪,熊水东,等.高性能三维全保偏光纤矢量水听器研制[J].光电子.激光,2011,22(12):1784-1788.
[14]Freitas J M D.Recent developments in seismic seabed oilreservoir monitoring applications using fibre-optic sensingnetworks[J].Measurement Science and Technology,2011,22(5):8-12.
[15]Freitas J M D.Effect of noise on accelerometer vectormeasurement in an ideal tri-axial system[J].Measure-ment Science and Technology,2010,22(4):1-4.
[16]LUO Hong,XIONG Shui-dong,HU Yong-ming,et al.Re-search on three-component all polarization maintaining fi-ber optic acceleromenter[J].Chinese Journal of Lasers,2005,32(10):1382-1386.罗洪,熊水东,胡永明,等.三分量全保偏光纤加速度传感器的研究[J].中国激光,2005,32(10):1382-1386.
[17]Meng P,Zhou H P,Zhang M,et al.Analysis and ameliora-tion about the cross-sensitivity of a fiber-opticaccelerom-eter based on compliant cylinder[J].Journal of Light-wave Technology,2008,26(3):365-372.
[18]KANG Chong,LIU Jia-jie,HUANG Zong-jun,et al.Phasegenerated carrier demodulation algorithmfor F-P opticalfiber vector hydrophone array[J].Journal of Optoelec-tronics.Lasers,2011,22(1):52-55.康崇,刘佳杰,黄宗军,等.F-P型同振式光纤矢量水听器相位产生载波解调算法[J].光电子.激光,2011,22(1):52-55.
[19]WANG Lin,HE Jun,LI Fang,et al.Ultra Low frequencyphase generated carrier demodulation technique for fibersensors[J].Chinese Journal of Lasers,2011,38(4):1-6.王林,何俊,李芳,等.用于探测极低频信号的光纤传感器相位生成载波解调方法[J].中国激光,2011,38(4):1-6.
[20]SUN Xun-fang,FANG Xiao-shu,GUAN Lai-tai.Mechanicsof materials(II)[M].Fourth Edition.Beijing:Higher Edu-cation Press,2002,54-64.孙训方,方孝淑,关来泰.材料力学(II)[M].第4版.北京:高等教育出版社,2002,54-64.
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