一种基于对称式悬臂梁的小型化低频FBG加速度传感器

A Miniaturized Low-Frequency FBG Accelerometer Based on Symmetric Cantilever Beam

摘要:

实时监测建筑、桥梁和水坝等大型工程结构的振动特征对开展结构健康监测等领域的研究具有重要意义。针对现有悬臂梁光纤光栅加速度传感器特性指标与小型化两者间无法兼顾的关键问题，提出一种对称式悬臂梁的小型化低频FBG加速度传感器。采用公式推导和ANSYS仿真软件对传感器结构参数进行结构参数优化分析和仿真设计，依据仿真结果制作传感器实物，最后对传感器进行传感器性能测试。研究结果表明，该传感器的固有频率约为72 Hz，可用于监测8-52 Hz频率范围内的振动信号，传感器灵敏度约为681.7 pm/g，抗横向干扰度小于4.9%。体积较同类FBG加速度传感器大幅减小，仅6.48 cm3，研究成果为研制同类型传感器提供了参考。

Abstract:

Real-time monitoring of vibration characteristics of large-scale engineering structures such as buildings, bridges and dams is of great significance for research in the field of structural health monitoring. Aiming at the key problem that the performance index and miniaturization of existing cantilever fiber grating acceleration sensors cannot be balanced, a miniaturized low-frequency FBG acceleration sensor with symmetrical cantilever beam is proposed. The formula derivation and ANSYS simulation software are used to carry out the structural parameter optimization analysis and simulation design of the sensor structure parameters. The research results show that the natural frequency of the sensor is about 72 Hz, which can be used to monitor vibration signals in the frequency range of 8-52 Hz. Compared with similar FBG acceleration sensors, the volume is greatly reduced, only 6.48 cm3, and the research results provide a reference for the development of the same type of sensors.