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两点封装的光纤布拉格加速度传感器设计
引用本文:刘钦朋,乔学光,傅海威,高宏. 两点封装的光纤布拉格加速度传感器设计[J]. 光学精密工程, 2012, 20(9): 2110-2115
作者姓名:刘钦朋  乔学光  傅海威  高宏
作者单位:1. 西北工业大学陕西省光信息技术重点实验室,陕西西安,710072
2. 西北工业大学陕西省光信息技术重点实验室,陕西西安710072;西北大学,陕西西安710069
3. 西安石油大学,陕西西安,710065
4. 西北大学,陕西西安,710069
基金项目:国家高技术研究发展计划资助项目,教育部科技创新工程重大项目,科技部国际科技合作项目,陕西重大科技创新项目,教育部科技创新工程重大项目培育资金资助项目
摘    要:提出了一种双半孔梁光纤布拉格光栅(FBG)加速度传感器实现加速度信号测量的方法.首先,建立了两点封装FBG的加速度传感模型,理论分析了加速度与位移敏感点的线性响应.其次,从理论上分析了两点封装方案中FBG的自振特性,讨论了封装光纤的长度和预应力对光纤自振频率的影响.最后,依据FBG的自振特性设计了FBG加速度传感器,并通过实验研究了FBG加速度传感器的线性响应和幅频响应特性.实验结果表明:提出的传感器在10~250 Hz具有较好的平坦区,加速度响应灵敏度为41.2pm/G;加速度与波长具有较好的线性关系,线性度为99.8%.同时,该加速度传感器具有较强的方向抗干扰性,轴向交叉灵敏度小于4.8%.

关 键 词:光纤光学  光纤布拉格光栅  两点封装  自振特性  加速度传感
收稿时间:2012-04-01

Design of FBG acceleration sensor based on two-dot coating
LIU Qin-peng , QIAO Xue-guang , FU Hai-wei , GAO Hong. Design of FBG acceleration sensor based on two-dot coating[J]. Optics and Precision Engineering, 2012, 20(9): 2110-2115
Authors:LIU Qin-peng    QIAO Xue-guang    FU Hai-wei    GAO Hong
Affiliation:1.Shanxi Key Laboratory of Optical Information Technology, Northwestern Polytechnical University,Xi’an 710072,China; 2.Xi’an Shiyou University Xi’an 710065,China; 3.Northwest University,Xi’an 710069,China)
Abstract:A Double-semicircle Cantilever Beam(DSCB) accelerometer based on a fiber Bragg grating(FBG) was proposed to measure the acceleration signals.Firstly,the model of FBG accelerometer based on the two-dot coating was established,and the linear response between acceleration and displacements of sensitive elements was analyzed theoretically.Then,the natural vibration of the FBG based two-dot coating was described,and the effects of the length and prestress of the coated fiber on natural vibration frequency were discussed.Finally,according to the natural vibration of FBG,the FBG accelerometer was designed,and the linear response,amplitude-frequency characteristics,and direction anti-interference of the FBG accelerometer were researched experimentally.Experimental results indicate that the sensor has good flat response from 10-250 Hz,and the sensitivity of the accelerometer is 41.2 pm/G.Furthermore,the sensor can offer a good linear response in a linear fitting of 99.8% and a good cross-axis anti-interference ability in the cross-axis sensitivity less than 4.8%.
Keywords:fiber optics  fiber Bragg grating  two-dot coating  natural vibration  acceleration sensing
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