光纤Bragg光栅低频振动传感器的特性研究
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摘要
设计了一种安装于双圆柱弹性环内并由多条弹性薄片条组装成的桶形骨架作为光纤Bragg光栅(FBG)振动传感器基底的传感结构,振动传感器的谐振频率为440Hz,加速度灵敏度约为76.4pm/g,采用相位载波调制式FBG振动传感器解调系统进行解调。实验结果表明,本文传感器经双圆柱弹性环对横向振动约束处理后,其幅频特性在20～300Hz频率范围内呈现出平坦的水平直线,对应于位相角φ=0处的相频特性曲线也呈现出平坦的水平直线,适合于工程技术中20～300Hz的振动信号实时检测。
A drum-type skeleton base structure of fiber Bragg grating(FBG) vibration sensor is designed,where the FBG is mounted on double cylindrical rings,and the structure consists of a number of flexible sheets.The FBG vibration sensor demodulation system uses phase modulation for demodulating.The experimental results shows that the resonant frequency of the developed FBG vibration sensor is 440 Hz,and the acceleration sensitivity is about 76.4 pm/g.The sensor adopts the double cylinder elastic rings for transverse vibration restraint and then its amplitude-frequency characteristics in the 20-300 Hz frequency range show a flat horizontal line,and the phase-frequency characteristics also show a flat horizontal line at phase angle of φ=0.The proposed sensor is suitable for the low-frequency(20-300 Hz) vibration signal detection.
A drum-type skeleton base structure of fiber Bragg grating(FBG) vibration sensor is designed,where the FBG is mounted on double cylindrical rings,and the structure consists of a number of flexible sheets.The FBG vibration sensor demodulation system uses phase modulation for demodulating.The experimental results shows that the resonant frequency of the developed FBG vibration sensor is 440 Hz,and the acceleration sensitivity is about 76.4 pm/g.The sensor adopts the double cylinder elastic rings for transverse vibration restraint and then its amplitude-frequency characteristics in the 20-300 Hz frequency range show a flat horizontal line,and the phase-frequency characteristics also show a flat horizontal line at phase angle of φ=0.The proposed sensor is suitable for the low-frequency(20-300 Hz) vibration signal detection.
引文
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[17]ZHAO Yong.Principle of fiber optic sensor and applica-tions[M].Beijing:Tsinghua University Press,2007,153-157.赵勇.光纤传感器原理与应用技术[M].北京:清华大学出版社,2007,153-157.
[2]WANG Jun-jie,DING Teng-jiao.Study of the planar opticalfiber Bragg grating hydrophone probe with accelerationcompensation[J].Chinese Journal of Acoustics,2011,30(20):149-161.
[3]WU Fei,ZHU Guo-fang,CHEN Xi.Study of the character-istics of concentration sensing based on FBG Fabry-Perotcavity[J].Optoelectronics Letters,2009,2(1):138-142.
[4]Guo T,Shao L,Tam H,et al.Tilted fiber grating acceler-ometer incorporating an abrupt biconical taper for clad-ding to core recouping[J].Opt.Express,2009,17(9):20651-20660.
[5]HUANG Hong-mei,YUAN Shen-fang.Study on the spectralresponse of fiber Bragg grating sensor under non-uniformstrain distribution in structural health monitoring[J].Opto-electronics Letters,2011,7(2):109-112.
[6]JIA Zhen-an,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.
[7]SUN Ru-jiao,SUN Li-min.Design research of fiber Bragggrating accelerometer[J].Acta Photonica Sinica,2007,36(1):63-67.孙儒蛟,孙利民,一种新型光纤布拉格光栅振动传感器研究[J].光子学报,2007,36(1):63-67.
[8]WEI Ting,Qiao Xue-guang,JIA Zhen-an.Simultaneoussensing of displacement and temperature with a singleFBG[J].Optoelectronics Letters,2011,7(1):26-29.
[9]JIANG Ming-shun,MENG Ling,SUI Qing-mei,et al.Hign-sensitivity vibration detection system based on double-LPFG demodulation[J].Journal of Optoelectronics.La-ser,2011,22(8):1207-1210.姜明顺,孟玲,隋青美,等.基于双LPFG解调的高灵敏度振动检测系统[J].光电子.激光,2011,22(8):1207-1210.
[10]LIU Qin-peng,QIAO Xue-guang,ZHAO Jian-lin,et al.Low-frequency FBG accelerometer based on double can-tilever beam[J].Journal of Optoelectronics.Laser,2011,22(8):1119-1123.刘钦朋,乔学光,赵建林,等.双悬梁光纤布拉格光栅低频加速度传感器[J].光电子.激光,2011,22(8):1119-1123.
[11]LIU Qin-peng,QIAO Xue-guang.Temperature-insensitiveacceleration sensing technology based onπphase ofdouble fiber Bragg gratings[J].Chinese Journal of La-sers,2011,38(2):02050061-02050066.刘钦朋,乔学光.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):02050061-02050066.
[12]LI Xue-cheng,LIU Su.Study on low-frequency character-istic of double-diaphragm fiber Bragg grating geophone[J].Journal of Optoelectronics.Laser,2010,21(4):529-532.李学成,刘肃,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.
[13]DENG An-yuan,WANG En-gang.Oscillation characteris-tics of molten metal free surface under compound mag-netic field[J].Journal of iron and steel research(Interna-tional),2011,18(5):25-30,37.
[14]JIANG Ming-shun,FENG De-jun,SUI Qing-mei,et al.Anovel fiber Bragg grating vibration sensor[J].Journal ofOptoelectronics.Laser,2011,21(1):34-37.姜明顺,冯德军,隋青美,等.新型光纤Bragg光栅振动传感系统[J].光电子.激光,2011,21(1):34-37.
[15]WANG Shan-li,XIANG Guang-huan,HU Man-li,et al.De-sign of a navel FBG vibration sensor[J].Journal of Opto-electronics.Laser,2011,22(4):515-519.王善鲤,向光华,忽满利,等.一种新型光纤Bragg光栅振动传感器的设计[J].光电子.激光,2011,22(4):515-519.
[16]SHAN Cheng-yang,NIU Yan-wen.The foundation of thedesign sensor[M].Beijing:Nation Defense IndustryPress,2007,61-64.单成祥,牛彦文.传感器设计基础[M].北京:国防工业出版社,2007,61-64.
[17]ZHAO Yong.Principle of fiber optic sensor and applica-tions[M].Beijing:Tsinghua University Press,2007,153-157.赵勇.光纤传感器原理与应用技术[M].北京:清华大学出版社,2007,153-157.
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