基于弓形梁增敏结构的FBG振动传感器研究  

Study on optical fiber grating vibration sensor based on bow beam sensitive characteristic

作　　者：叶婷[1] 梁大开[1] 曾捷[1] 张少华[1] 孙玮[1] 

机构地区：[1]南京航空航天大学机械结构强度与振动国家重点实验室智能材料与结构研究所,南京210016

出　　处：《仪器仪表学报》2012年第1期139-145,共7页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(60907038);航空科学基金(2008ZD52047);611航空科研基金;江苏省自然科学基金(BK2009370);中国博士后科学基金(20090461116);江苏省博士后科研资助计划(1001010B)资助项目

摘　　要：利用光纤光栅(FBG)随弓形梁弯曲变形的敏感特性,通过设计特制的增敏结构,研制了一种基于弯曲特性的FBG振动传感器。根据ANSYS数值分析和实验结果表明,在加速度0～5 g、工作频率0～40 Hz范围内,传感器加速度特性曲线呈现良好对应关系,灵敏度可达458.1 pm/g,精度约0.002 g。该传感器系统采用双光栅形式实现了温度补偿,且在所测加速度范围内显示出较好的灵敏度和重复性,频响误差小,能够满足航空结构振动监测与控制需求。Fiber Bragg Grating （FBG） has a sensitive characteristic that it deforms with bow beam bending. designing a hypersensitivity structure, we developed an optical fiber grating vibration sensor based on the characteristic. ANSYS numerical analysis and experimental result indicate that when the acceleration change Through bending s from 0 to 5 g and working frequency in a range from 0 to 40 Hz, good relationship between variation of wavelength and acceleration is obtained ; the resolution is 458.1 pm/g and precision is about 0. 002 g. In the acceleration range measured in the experiment, the sensor system has good sensitivity, repeatability and small frequency response error, also the temperature influence can be self-compensated, which can satisfy the vibration monitoring and control requirements of airline structure highly.

关 键 词：FBG振动传感器 弓形梁 高灵敏度 温度补偿 数值仿真 

分 类 号：TN247[电子电信—物理电子学]