金属环封装低频光纤布拉格光栅振动传感系统研制
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摘要
研制了一种金属环封装的单柱体芯轴式光纤布拉格光栅(FBG)振动传感器,搭建了基于非平衡迈克耳逊干涉仪相位载波调制(PGC)解调技术的FBG振动传感器解调系统,实现了低频振动信号的高精度实时解调,并分析了各参数对传感器谐振频率和灵敏度等特性的影响。实验结果表明,研制的FBG振动传感器谐振频率为388Hz,在10～200Hz频率范围内,传感器的加速度灵敏度约为81pm/g,且加速度响应平坦,起伏小于1dB,与理论分析结果基本一致。研制的振动传感器可实现200Hz以下低频振动信号的实时检测,解调系统的波长检测精度为1.07×10-3 pm,最小可检测加速度为1.3×10-5 g。
A metal annulus-based single cylinder mandrel structure fiber Bragg grating(FBG) vibration sensor and a phase generated carrier(PGC) demodulator based on an unbalanced Michelson interferometer are proposed in this paper.The high precision and real time signal detection are achieved for this FBG vibration sensor.Experimental results show that its resonance frequency is 388 Hz and its acceleration sensitivity is around 81 pm/g over the frequency range from 10 Hz to 200 Hz,with fluctuation at different frequencies less than 1 dB.This FBG vibration sensor is suitable for monitoring vibration signals below the frequency of 200Hz.The wavelength resolution of the demodulation system is 1.07×10-3 pm,and the acceleration resolution of the sensing system is 1.3×10-5 g.
A metal annulus-based single cylinder mandrel structure fiber Bragg grating(FBG) vibration sensor and a phase generated carrier(PGC) demodulator based on an unbalanced Michelson interferometer are proposed in this paper.The high precision and real time signal detection are achieved for this FBG vibration sensor.Experimental results show that its resonance frequency is 388 Hz and its acceleration sensitivity is around 81 pm/g over the frequency range from 10 Hz to 200 Hz,with fluctuation at different frequencies less than 1 dB.This FBG vibration sensor is suitable for monitoring vibration signals below the frequency of 200Hz.The wavelength resolution of the demodulation system is 1.07×10-3 pm,and the acceleration resolution of the sensing system is 1.3×10-5 g.
引文
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[18]Zhang Y,Li S,Yin Z,et al.Fiber Bragg grating basedseismic geophone for oil/gas prospecting[J].Optical En-gineering,2006,45(8):084404-1-4.
[2]YU Mei.Research prospects of metrology technology forlow-frequency and super low-frequency vibration[J].Journal of Vibration and Shock,2007,16(11):83-86.于梅.低频超低频振动计量技术的研究与展望[J].振动与冲击,2007,16(11):83-86.
[3]Nicolas B,mars J,lacoume J L,et al.Are ultra-low fre-quency waves suitable for detection[A].Ocean′s 2002Conference and Exhibition[C].2002,2:1109-1113.
[4]Paulo Antunes,Humberto Varum,Paulo André.Uniaxial fi-ber Bragg grating accelerometer system with temperatureand cross axis insensitivity[J].Measurement Journal ofthe International Measurement Confederation,2011,44(1):1292-1298.
[5]Amanda Fender,William N.MacPherson,Robert R.J.Mai-er,et al.Two-axis temperature-insensitive accelerometerbased on multicore fiber Bragg gratings[J].IEEE SensorsJournal,2008,8(7):1292-1298.
[6]Gagliardi G,Salza1 M,Ferraro1 P,et al.Design and testof a laser-based optical-fiber Bragg-grating accelerome-ter for seismic applications[J].Measurement Science andTechnology,2008,19:1-7.
[7]ZHU Yi-nian,SHUN Ping,LU Chao,et al.Fiber Bragggrating accelerometer with temperature insensitivity[J].Microwave and Optical Technology Letters,2003,37(2):151-153.
[8]Tuan G,Shao L Y,Tam H Y,et al.Tilted fiber grating ac-celerometer incorporating an abrupt biconical taper forcladding to core recoupling[J].Optics Express,2009,17(23):20651-20660.
[9]Berkoff T A,Kersey A D.Experimental demonstration of afiber Bragg grating accelerometer[J].IEEE PhotonicsTechnology Letters,1996,8(12):1677-1679.
[10]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.
[11]LI Lan,DONG Xin-yong,ZHAO Chun-liu,et al.A tempera-ture-independent fiber Bragg grating accelerometer[J].Journal of Optoelectronics.Laser,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.
[12]JIA Zhe-nan,YING Xu-dong,QIAO Xue-guang,et al.Studyon demodulate technique of high-speed dynamic vibrationsignal for fiber grating[J].Journal of Optoelectronics.Laser,2011,22(5):729-732.贾振安,营旭东,乔学光,等.光纤光栅高速动态振动信号解调技术的研究[J].光电子.激光,2011,22(5):729-732.
[13]QIAO Xue-guang,DING Feng,JIA Zhe-nan,et al.Highprecision optical fiber Bragg grating demodulation systembased on the source filtering for seismic detection[J].Ac-ta Optica Sinica,2010,30(8):2219-2223.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):2219-2223.
[14]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.
[15]ZHOU Xue-fang.Study of fiber optical Bragg grating sens-ing technology[D].Wuhan:Wuhan University of Technol-ogy,2003.周雪芳.光纤布拉格光栅振动传感技术研究[D].武汉:武汉理工大学,2003.
[16]Dandridge A,Tveten A B,Giallorenzi T G.Homodyne de-modulation scheme for fiber optic sensors using phasegenerated carrier[J].IEEE Trans on Microwave Theoryand Techniques,1982,MTT230(10):1635-1641.
[17]YU You-long,TAN Hua-yao,CHONG Yong-kang.A fiberBragg grating sensor system with interferometric demod-ulation technique[J].Acta Optica Sinica,2001,21(8):987-989.余有龙,谭华耀,锺永康.基于干涉解调技术的光纤光栅传感系统[J].光学学报,2001,21(8):987-989.
[18]Zhang Y,Li S,Yin Z,et al.Fiber Bragg grating basedseismic geophone for oil/gas prospecting[J].Optical En-gineering,2006,45(8):084404-1-4.
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