基于光纤Bragg光栅的地震检波器的理论与实验研究
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摘要
提出了一种新型的基于光纤Bragg光栅(FBG)的地震检波器。FBG地震检波器传感头由平面弹簧片、质量块和FBG构成。给出了该检波器的力学模型,理论推导与分析了该检波器的幅频特性和加速度灵敏特性,并讨论了影响该检波器灵敏度的主要因素。实验结果表明,该检波器具有良好的线性度、稳定性和耐受性;检波器的频率响应范围为10～140 Hz,传感器灵敏度为25.9pm/g,共振频率为167 Hz,较符合理论值;最高可检测加速度值大于30g。
A novel fiber Bragg grating(FBG) based seismic sensor is presented in this paper.The FBG seismic sensor head consists of FBG,spring and mass.The mechanical model is demonstrated.The amplitude-frequency and acceleration characteristics of the FBG seismic sensor are theoretically analyzed.The main factors affecting the sensitivity are also given.The experimental results show that the FBG seismic sensor system has excellent stability and high durability.The frequency response range is from 10 Hz to 140 Hz,the resonant frequency is 167 Hz,and the acceleration sensitivity of the FBG seismic sensor is 25.4 pm/g,Which agree with the theoretical values.The maximum detected acceleration is larger than 30 g.
A novel fiber Bragg grating(FBG) based seismic sensor is presented in this paper.The FBG seismic sensor head consists of FBG,spring and mass.The mechanical model is demonstrated.The amplitude-frequency and acceleration characteristics of the FBG seismic sensor are theoretically analyzed.The main factors affecting the sensitivity are also given.The experimental results show that the FBG seismic sensor system has excellent stability and high durability.The frequency response range is from 10 Hz to 140 Hz,the resonant frequency is 167 Hz,and the acceleration sensitivity of the FBG seismic sensor is 25.4 pm/g,Which agree with the theoretical values.The maximum detected acceleration is larger than 30 g.
引文
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[15]HUANG Ke-zhi,XIA Zhi-xi,Xue Ming-de.Theory of plateand shells[M].Beijing:Tsinghua University,1987,130-135.黄克智,夏之熙,薛明德.板壳理论[M].北京:清华大学出版社,1987,130-135.
[2]ZHANG Yan,LI San-guo,YIN Zhi-feng,et al.Fiber-Bragg-grating-based seismic geophone for oil/gasprospecting[J].Optical Engineering,2006,45(8):084404-1-084404-4.
[3]LIU Han-ping,WANG Jian-gang,CUI Hong-liang,et al.Fi-ber Bragg grating seismic detector[J].Journal of Shan-Dong University(Engineering Science),2007,37(2):89-92.刘汉平,王健刚,崔洪亮,等.FBG地震波检波器[J].山东大学学报(工学版),2007,37(2):89-92.
[4]GUO Tuan,IVANANOV A,CHEN Cheng-kun,et al.Tem-perature-independent tilted fiber grating vibration sensorbased on cladding-core recoupling[J].Optics Letters,2008,33(9):1004-1006.
[5]Hou S,Cai C S,Ou J P.Seismic damage identification forsteel structures using distributed fiber optics[J].AppliedOptics,2009,48(22):4483-4489.
[6]YU Da-kuan,JIA Zhen-an,QIAO Xue-guang,et al.FBGsensors combining target with cantilever beam for simul-taneous measurement of Flow-rate/temperature[J].Jour-nal of Optoelectronics.Laser,2010,21(5):710-713.禹大宽,贾振安,乔学光,等.基于靶式和悬臂梁的FBG流量/温度同时测量研究[J].光电子.激光,2010,21(5):710-713.
[7]WANG Hong-liang,WU Hua-chun,FENG De-quan,et al.Research on the FBG sensor used for high temperature-pressure wells[J].Journal of Optoelectronics.Laser,2011,22(1):42-45.王宏亮,邬华春,冯德全,等.高温高压油气井下FBG传感器的应用研究[J].光电子.激光,2011,22(1):42-45.
[8]JIANG Ming-shun,MENG Ling,SUI Qing,et al.High-sensi-tivity vibration detection system based on double-LPGdemodulation[J].Journal of Optoelectronics.Laser,2011,22(8):1207-1210.姜明顺,孟玲,隋青美,等.基于双LPG解调的高灵敏度振动检测系统[J].光电子.激光,2011,22(8):1207-1210.
[9]NING Jing,ZHANG Yan,CUI Hong-liang.New structuraldesign and test results of fiber Bragg grating geophones[A].Optical Fiber Sensors(OFS)[C].2006,TuE60.
[10]TAO Guo,ZHANG Xiang-lin,LIU Xin-ru,et al.A new typeof fiber Bragg grating based seismic geophone[J].Ap-plied Geophysics,2009,6(1):84-92.
[11]LI Xue-cheng,LIU Su,ZHANG Wen-tao,et al.Study onlow-frequency characteristic of double-diaphragm fiberBragg grating geophone[J].Journal of Optoelectronics.Laser,2010,21(4):529-532.李学成,刘肃,张文涛,等.双膜片结构FBG地震检波器低频特性的研究[J].光电子.激光,2010,21(4):529-532.
[12]LIU Qin-peng,QIAO Xue-guang,ZHAO Jian-lin,et al.Temperature-insensitive acceleration sensing technologybased onπphase of double fiber Bragg gratings[J].Chinese J.Lasers,2011,38(2):0205006.刘钦朋,乔学光,赵建林,等.双光栅π相位差温度不敏感加速度传感技术研究[J].中国激光,2011,38(2):0205006.
[13]JIANG Yi.Advanced optical sensing technology[M].Bei-jing:Science Press,2009,252-260.江毅.高级光纤传感技术.北京:科学出版社,2009,252-260.
[14]FANG Tong,XUE Pu.Vibration theory and applications[M].Xi′an:Northwestern Polytechnical University Press,2004,57-63.方同,薛璞.振动理论及应用[M].西安:西北工业大学出版社,2004,57-63.
[15]HUANG Ke-zhi,XIA Zhi-xi,Xue Ming-de.Theory of plateand shells[M].Beijing:Tsinghua University,1987,130-135.黄克智,夏之熙,薛明德.板壳理论[M].北京:清华大学出版社,1987,130-135.
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