基于转动支承梁式的光纤光栅低频加速度传感器  

Fiber Bragg grating accelerometer based on rotating beam for low-frequency vibration

作　　者：李剑芝[1] 申博豪 张婉洁 孙宝臣[1] Li Jianzhi;Shen Bohao;Zhang Wanjie;Sun Baochen(Key Laboratory of Structure Health Monitoring and Control,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Mechanical Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学大型结构健康诊断与控制重点实验室,石家庄050043 [2]石家庄铁道大学机械工程学院,石家庄050043

出　　处：《仪器仪表学报》2021年第12期74-82,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51778379);河北自然科学基金(E2019210201)项目资助。

摘　　要：为了实现低频振动的高灵敏度测量,设计了一种基于转动支撑梁的新型光纤布拉格光栅加速度计。通过分析其振动模型和MATLAB数值计算,优化了传感器的结构参数,设计传感器理论灵敏度为1725 pm/g,固有频率为68.4 Hz。同时通过COMSOL模拟分析传感器的动态特性,其模拟结果与理论分析吻合。频响特性和幅值特性实验结果表明光纤光栅加速度计在加速度0~2 g、工作频率0.5~20 Hz的范围内,传感器加速度特性曲线呈现良好线性关系,灵敏度高达1495.2 pm/g,重复性良好。该传感器结构简单紧凑,轴承结构有效减少悬臂梁振动过程中的弹性能耗,可显著提高其灵敏度,能够实现低频振动信号的探测。A fiber Bragg grating accelerometer based on the rotating beam is designed to attain high accelerated sensitivity in low-frequency vibration.By analyzing its vibration model and MATLAB numerical calculation,the optimized structural parameters of the sensor are achieved.Its theoretical sensitivity and natural frequency are 1725 pm/g and 68.4 Hz,respectively.Meanwhile,its sensitivity response characteristics are simulated by COMSOL,and the simulation results are closely consistent with the theoretical analysis.Experimental results of frequency response and amplitude characteristics indicate that when the acceleration changes from 0~2 g and working frequency in a range from 0.5~20 Hz,their central wavelength of FBGs is linearly related to the vibration acceleration.In addition,a high sensitivity up to 1495.2 pm/g and a good repeatability is achieved.The sensor has a simple and compact structure,in which the elastic energy consumption is decreased by bearing during the vibration of the cantilever beam.Therefore,its sensitivity is significantly improved.And the low-frequency vibration signals are detectable.

关 键 词：传感器 振动测量 速度传感器 光纤布拉格光栅 低频 旋转梁 高灵敏度 

分 类 号：TN253[电子电信—物理电子学] TH825[机械工程—仪器科学与技术]