CO_2激光写入的长周期光纤光栅加速度传感器实验研究
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摘要
基于高频CO2激光在普通单模光纤上制作的长周期光纤光栅的应变和弯曲特性,本文设计制作了一种新型的加速度传感器.基于等强度梁理论分析了梁振动与长周期光纤光栅输出光强之间的关系,最后推导出了系统的加速度理论模型.文中搭建了长周期光纤光栅加速度计的实验测量系统.实验结果表明系统的加速度灵敏度约为2.82v/g,准确度约为8.96×10-4g,加速度测量误差约为0.82%.基于这种长周期光纤光栅的加速度计具有成本低、灵敏度较高等优点,因此在振动测量、惯性导航等方面将具有较好的潜在应用价值.
A accelerometer based on the strain and bend characteristics of long period fiber grating (LPFG),which fabricated in common communication optical fiber by using high-frequency CO2 laser pulses,is investigated.The relationship between vibration of the uniform strength beam and the light intensity of LPFG is theoretically analyzed and the mathematical model of the acceleration is gotten.Experimental results show that,this acceleration measuring system has a sensitivity of ~2.82 v/g,a resolution of ~8.96×10-4 g.The error between theoretical and experimental value is about 0.82%.Such kind of accelerometer based on LPFG can be widely used because of the advantages of low cost,high sensitivity.
A accelerometer based on the strain and bend characteristics of long period fiber grating (LPFG),which fabricated in common communication optical fiber by using high-frequency CO2 laser pulses,is investigated.The relationship between vibration of the uniform strength beam and the light intensity of LPFG is theoretically analyzed and the mathematical model of the acceleration is gotten.Experimental results show that,this acceleration measuring system has a sensitivity of ~2.82 v/g,a resolution of ~8.96×10-4 g.The error between theoretical and experimental value is about 0.82%.Such kind of accelerometer based on LPFG can be widely used because of the advantages of low cost,high sensitivity.
引文
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[2]ZOU Qi-lin,WANG Li-wei,PANG Meng,et al.Down-hole seismic survey system withfiber-optic accelerometer sensor for3-Di mensions vertical seismic profile[J].Acta Photonica Sinica,2008,37(1):77-81.邹琪琳,王利威,庞盟,等.3维VSP光纤检波器井下地震采集系统[J].光子学报,2008,37(1):77-81.
[3]GANGOPADHYAY T K,HENDERSON P J.Vibration history and measurement with an extrinsic Fabry?Perot sensor with solid-state laser interferometry[J].Appl Opt,1999,38(12):2471-2477.
[4]TAO Fa,WANG Hui-nan.A study on a novel fiber-optic accelerometer using a GRI Nlens[J].Acta Photonica Sinica,2005,34(7):1057-1061.陶发,王惠南.一种新型GRI N透镜光纤加速度计的研究[J].光子学报,2005,34(7):1057-1061.
[5]RAO Yun-jiang.Recent progress in fiber-optic extrinsic Fabry-Perot interferometric sensors[J].Opt Fiber Technol,2006,12(3):227-237.
[6]AU H Y,KHIJ WANI A S K,TAM H Y.Fiber Bragg grating based accelerometer[C].SPIE,2008,7004:S42-S42.
[7]SUN Ru-jiao,SUN Li-min,SUN Zhi,et al.Design research of fiber bragg grating accelerometer[J].Acta Photonica Sinica,2007,36(1):63-67.孙汝蛟,孙利民,孙智,等.一种新型光纤布喇格光栅振动传感器研究[J].光子学报,2007,36(1):63-67.
[8]ZHANG Yan,LI San-guo,NI NG Jing,et al.Seismic wave detection systembased on fiber optic sensor[C].SPIE,2006,6296:J2961-J2961.
[9]BERKOFF T A,KERSEY A D.Experi mental demonstration of a fiber Bragg grating accelerometer[J].IEEE Photonics Technology Letters,1996,8(12):1677-1679.
[10]LI AO Yi,RAO Yun-jiang,HU Yong-ming,et al.Alow-cost long-period fiber grating-based sensor device[J].Acta Photonica Sinica,2007,36(4):702-705.廖毅,饶云江,胡永明,等.低成本长周期光纤光栅传感系统[J].光子学报,2007,36(4):702-705.
[11]RAO Yun-jiang,WANG Jiu-ling,ZHU Tao,et al.A high sensitivity pressure sensor based on twisted long-period fiber grating[J].Acta Photonica Sinica,2007,36(3):487-490.饶云江,王久玲,朱涛,等.基于扭曲长周期光纤光栅的高灵敏度压力传感器[J].光子学报,2007,36(3):487-490.
[12]University of Science&Technology Beijing.Northeastern University engineering mechanics[M].Beijing:Higher Education Press,1979,7:188-190.北京科技大学东北大学编,工程力学[M].北京:高等教育出版社,1979,7:188-190.
[13]RAO Yun-jiang,WANG Yi-ping,ZHU Tao.Principles&application of fiber gratings[M].Science Press,2006,8:139-140,292-306.饶云江,王义平,朱涛.光纤光栅原理及应用[M].科学出版社,2006,8:139-140,292-306.
[14]ZHU Tao,RAO Yun-Jiang,MO Qiu-Ju.A high sensitivity fiber-optic torsion sensor based on a novel ultra long-period fiber grating[J].Acta Physica Sinica,2006,55:249-253.朱涛,饶云江,莫秋菊.基于超长周期光纤光栅的高灵敏度扭曲传感器[J].物理学报,2006,55:249-253.
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