中国激光, 2019, 46 (9): 0910003, 网络出版: 2019-09-10
基于膜片与菱形结构的光纤布拉格光栅加速度传感器 下载: 857次
Fiber Bragg Grating Accelerometer Based on Diaphragm and Diamond Structure
摘要
提出了一种基于膜片与菱形结构的光纤布拉格光栅(FBG)加速度传感器,理论分析了传感器的加速度检波机理,推导了其灵敏度和谐振频率表达式。利用ANSYS和MATLAB软件对传感器的结构参数进行了优化设计,得到了尺寸更小但能满足实际应用需求的FBG加速度传感器,构建了有限元模型并仿真了传感系统的振动特性。制备了传感器实物并进行了动静态特性测试。结果表明:在20~90 ℃温度条件下,FBG传感器具有较好的温度自补偿效果,有效减小FBG中温度对加速度测量的影响;该传感器1阶固有频率约为681.4 Hz,在频率为0~500 Hz范围内,传感器灵敏度与振动信号频率呈良好的线性关系;膜片与菱形结构的组合应用增强了传感器横向抗干扰能力,并使得横向干扰度小于5%。
Abstract
A fiber Bragg grating (FBG) accelerometer based on diaphragm and diamond structure is proposed. The acceleration detection mechanism of the sensor is explained, and its sensitivity and resonance frequency expression are derived. The structural parameters of the sensor are optimized by using ANSYS and MATLAB softwares, and the FBG accelerometer with small structural size and meeting the practical application requirements is obtained. The finite element model is constructed to simulate the vibration characteristics of the sensing system. The sensor is fabricated and tested for dynamic and static characteristics. The experiments show that the sensor has better temperature compensation effect under the temperature of 20-90 ℃, which effectively reduces the influence of temperature on acceleration measurement. The first-order natural frequency of the sensor is about 681.4 Hz. In the range of 0-500 Hz, the sensor''s sensitivity has a good linear relationship with the vibration signal frequency. The combined application of the diaphragm and diamond structure enhances the sensor''s ability to resist lateral interference with a lateral interference of less than 5%.
魏莉, 余玲玲, 姜达州, 刘壮, 李恒春. 基于膜片与菱形结构的光纤布拉格光栅加速度传感器[J]. 中国激光, 2019, 46(9): 0910003. Wei Li, Yu Lingling, Jiang Dazhou, Liu Zhuang, Li Hengchun. Fiber Bragg Grating Accelerometer Based on Diaphragm and Diamond Structure[J]. Chinese Journal of Lasers, 2019, 46(9): 0910003.