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基于L 形刚性梁与弹性膜片结构的低频光纤光栅加速度传感器

Fiber Bragg Grating Accelerometer Based on L-Shaped Rigid Beam and Elastic Diaphragm for Low-Frequency Vibration Measurement

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摘要

为满足低频振动信号精确测量的实际需要,设计了一种基于L 形刚性梁与弹性膜片结构的光纤布拉格光栅加速度传感器。进行了结构理论分析,并通过Matlab 仿真讨论了各结构参量对传感器灵敏度和谐振频率的影响,进行了参量优化设计。根据理论分析结果制作了加速度传感器并对其加速度灵敏度的幅频特性、线性响应和抗横向干扰特性进行了测试。实验结果表明,L形刚性梁的传动结构有效增强了结构稳定性,消除了传统悬臂梁结构带来的光纤光栅啁啾或反射谱多峰现象。加速度传感器在20~70 Hz的低频段具有平坦的灵敏度响应,加速度灵敏度可达220 pm/g,线性响应的相关度为99.98%;金属膜片使得该传感器具有较强的抗横向干扰能力,在工作频段内横向串扰为-32.73 dB。

Abstract

A fiber Bragg grating accelerometer based on L-shaped rigid beam and elastic diaphragm is designed for high- precision detection of low- frequency vibration signals. The structure of accelerometer is analyzed theoretically, and the influence of each parameter on the sensitivity and resonant frequency is discussed by simulation with Matlab. Optimization design is made on the basis of simulation. According to the analysis result, the accelerometer is made. The sensing performances that include amplitude- frequency characteristic, linear response and ability of resisting transverse interference in the cross-axis are tested experimentally. Experimental results show that the structure of accelerometer is stable by using L-shaped rigid beam. Also the chirp effect of grating and the multi-peak of reflective spectrum are avoided. The sensor has good performances in detection of low-frequency vibration signals because it has flat response from 20 Hz to 70 Hz and the sensitivity is about 220 pm/g with a linear coefficient of 99.98% . Elastic diaphragm used as elastic element efficiently eliminate transverse interference while the interference degree can be less than -32.73 dB.

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中图分类号:TN253

DOI:10.3788/aos201535.1206005

所属栏目:光纤光学与光通信

基金项目:2015-07-08

收稿日期:2015-05-26

修改稿日期:2015-07-08

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作者单位    点击查看

曾宇杰:国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
王俊:国防科学技术大学海洋科学与工程研究院, 湖南 长沙 410073
杨华勇:国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
马丽娜:国防科学技术大学海洋科学与工程研究院, 湖南 长沙 410073

联系人作者:曾宇杰(15574944101@163.com)

备注:曾宇杰(1991—),男,硕士研究生,主要从事光纤光栅传感方面的研究。

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