基于转动支承梁式的光纤光栅低频加速度传感器

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 1 725 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 1 495. 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。

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

A fiber Bragg grating accelerometer based on the rotating beam is designed to attain high accelerated sensitivity in lowfrequency 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 1 725 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 1 495. 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.