摘要
研制了一种基于双等强度悬臂梁式光纤布拉格光栅(FBG)振动传感器。首先采用ANSYS软件对传感器进行数值计算与仿真,得到在各个阻尼比下传感器的幅频特性曲线和相频特性曲线,不断变化传感器结构参数,寻找最优谐振频率与加速度灵敏度,从而得到传感器最优结构参数;根据仿真所得的最优结构参数,进行传感器加工;利用所加工的振动传感器进行振动台试验研究并对所得实验数据进行处理,将处理后的数据与ANSYS软件仿真得到的数据进行比较,结果表明,振动平台所测得的实验结果与ANSYS软件仿真结果相吻合,传感器的谐振频率为80.74Hz,可实现50Hz以下低频振动信号的实时监测,在5～50Hz之间的加速度灵敏度约为20.85pm/m.s-2。
A fiber Bragg grating （FBG） acceleration vibration sensor based on the double uniform strength cantilever beams is developed. First, the simulation is conducted by ANSYS software. We can obtain the sensor amplitude-frequency and phaseffrequency characteristics in each damping ratio. Through changing the parameters of the sensor structure,we can get sensor optimal structure parameters that can make the sensor with the best resonance frequency and acceleration sensitivity. Second, the sensor is fabricated based on the optimal structure parameters. Finally,the sensor is studied by the shaking table test. The experimental results show that the resonant frequency of the developed vibration sensor is 80. 74 Hz, and the acclelration sensitivity is about 20. 85 pm/m . s-2. Amplitude-frequency characteristics of the sensor in the 5-50 Hz frequency range show a flat horizontal line. The proposed sensor is suitable for the low-frequency （5-50 Hz） vibration signal detection.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2013年第4期635-641,共7页
Journal of Optoelectronics·Laser
基金
国家"863"计划项目(2009AA6Z203)
陕西省教育厅专项科研计划(12JK0683
12JK0471)资助项目
关键词
双等强度悬臂梁
仿真计算
光纤布拉格光栅(FBG)
振动传感器
固有频率
double uniform strength cantilever beams
simulation analysis
fiber Bragg grating （FBG）
vibration sensor
natural frequency
