基于长周期光纤光栅的新型地震检波器
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摘要
基于长周期光纤光栅能透射特定波长的性质,以及其无后向反射的优点,提出一种新型的长周期光纤光栅地震检波器系统。以长周期光纤光栅相位匹配条件为基础,逐步推导出长周期光纤光栅地震检波器的灵敏度公式。建立长周期光纤光栅地震检波器的力学模型,并推导出检波器系统的传递函数。通过实例仿真得到该长周期光纤光栅地震检波系统的幅频特性图,从而证明了长周期光纤光栅用于地震检波器的可行性。通过调整光纤长度、质量块质量、阻尼系数等参数而得到适合的频率特性和灵敏度,为将来提高该系统的性能指明了研究方向。
A new type of geophone is presented,based on the narrow band transmission and free of back reflection features of long period fiber grating.The acceleration sensitivity of the resonance wavelength of the long period fiber grating geophone system was deduced and analyzed with the phase matching of long period fiber grating as preconditions.The mechanic model of the long period fiber grating geophone was established and the transfer function of the geophone was deduced.Through simulating a simple example,the amplitude-frequency characteristics of the long period fiber grating geophone was obtained,and its feasibility was proved.The parameters such as length of the optical fiber,the mass of the mass block and the damping factor were improved to achieve proper frequency feature and sensitivity.
A new type of geophone is presented,based on the narrow band transmission and free of back reflection features of long period fiber grating.The acceleration sensitivity of the resonance wavelength of the long period fiber grating geophone system was deduced and analyzed with the phase matching of long period fiber grating as preconditions.The mechanic model of the long period fiber grating geophone was established and the transfer function of the geophone was deduced.Through simulating a simple example,the amplitude-frequency characteristics of the long period fiber grating geophone was obtained,and its feasibility was proved.The parameters such as length of the optical fiber,the mass of the mass block and the damping factor were improved to achieve proper frequency feature and sensitivity.
引文
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[2]ZHANG Yan,YIN Zhi-fan,CHEN Bing-quan,et al.A novel fiber Bragg grating based seismic geophonefor oil/gas prospecting[J].SPIE,2005,5765:1112-1120.
[3]MERRY H W K,WALTER L.Permanent full wavesubsea seismic monitoring systems provides nextgeneration of applications for oil and gas reservoirexploration[C]∥[S.l.]:IEEE Scientific Use ofSubmarine Cables and Related Technologies,2003:276.
[4]SZCZERBINSKI Z,KOWALIK S.Parallelizing aglobal optimization method in a distributed-memoryenvironment[C]∥[S.l.]:IEEE Parallel andDistributed Processing,2000:38-42.
[5]MANUEL A,DEL RIO J,OLIVAR G,et al.Newgeneration of ocean bottom seismometers[C]∥[S.l.]:Instrumentation and Measurement TechnologyConference,Proceedings of the 19th IEEE,2002:571-575.
[6]张向林,陶果,刘新茹.油气地球物理勘探技术进展[J].地球物理学进展,2006,21(1):143-151.ZHANG Xiang-lin,TAO Guo,LIU Xin-ru.Progress in oil geophysical exploration[J].Progressin Geophysics,2006,21(1):143-151.(in Chinese)
[7]贾宏志,李育林,忽满利.长周期光纤光栅传感器温度和应变灵敏度分析[J].光子学报,1999,28(8):27-29.JIA Hong-zhi,LI Yu-lin,HU Man-li.Analysis ofstrain and temperature sensitivities of long-periodfiber gratings[J].Acta Photonica Sinica,1999,28(8):27-29.(in Chinese)
[8]李川,张以谟,赵永贵,等.光纤光栅:原理、技术与传感应用[M].北京:科学出版社,2005.LI Chuan,ZHANG Yi-mo,ZHAO Yong-gui,et al.Fiber grating:principle,technology and sensingapplication[M].Beijing:Science Press,2005.(inChinese)
[9]何伟,王昌,李捷,等.长周期光纤光栅横向压力传感特性的研究[J].武汉理工大学学报,2004,26(8):20-22.HE Wei,WANG Chang,LI Jie,et al.Study onproperties of optical fiber pressure sensors based onlong-period fiber gratings[J].Journal of WuhanUniversity of Technology,2004,26(8):20-22.(inChinese)
[10]王惠文.光纤传感技术与应用[M].北京:国防工业出版社,2001.WANG Hui-wen.Technology and application offiber sensing[M].Beijing:National DefenceIndustry Press,2001.(in Chinese)
[11]张志鹏.光纤传感器原理[M].北京:中国计量出版社,1991.ZHANG Zhi-peng.The principle of fiber sensors[M].Beijing:China Metrology Publishing House,1991.(in Chinese)
[12]彭仕玉,元秀华,张国云,等.光纤光栅传感器温度与轴向应变灵敏度的研究[J].光通信研究,2003(106):46-48.PENG Shi-yu,YUAN Xiu-hua,ZHANG Guo-yun,et al.Study on temperature and axial strain′s sensitivityof optical fiber grating sensors[J].Study on OpticalCommunications,2003(106):46-48.(in Chinese)
[13]李志全,王莉,黄丽娟,等.基于长周期光纤光栅的折射率与浓度传感方案的研究[J].应用光学,2004,25(4):48-50.LI Zhi-quan,WANG Li,HUANG Li-juan,et al.Study on refractive index and concentration sensorbased on long-period fiber grating[J].Journal ofApplied Optics,2004,25(4):48-50.(in Chinese)
[14]陈建军,张伟刚,涂勤昌,等.温度不敏感光纤光栅压强传感器[J].应用光学,2007,28(1):77-81.CHEN Jian-jun,ZHANG Wei-gang,TU Qin-chang,et al.Fiber Bragg grating pressure sensorinsensitive to temperature[J].Journal of AppliedOptics,2007,28(1):77-81.(in Chinese)
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