Hong Li, Mai Menglin, Zhang Ruilei, Luo Qingshan, Wang Xiaoyu
Institute of Disaster Prevention, Sanhe Hebei 065201, China.
Hebei Key Laboratory of Seismic Disaster Instrument and Monitoring Technology, Sanhe Hebei 065201, China.
Rev Sci Instrum. 2023 Jun 1;94(6). doi: 10.1063/5.0146860.
Acceleration sensors play an important role in bridges, dams, seismic monitoring, geological exploration, and more. Aiming at the problem that it is still difficult to accurately measure low-frequency vibration signals with low-frequency acceleration sensors, a high-sensitivity, wide-low-band fiber Bragg grating (FBG) acceleration sensor incorporating a rotating cantilever and springs was proposed. A sensor mechanics model was built, and its key parameters were analyzed theoretically and optimized in size. ANSYS Workbench was used for simulation analysis, and the physical sensor was developed while a low-frequency test platform was established for performance tests. The experimental results suggested that the natural frequency of the sensor was 78 Hz, the operating frequency band was 1-55 Hz, the sensitivity was 1127.2 pm/g, the transverse interference immunity was less than 5.45%, and the dynamic range was 86.45 dB. With high sensitivity, wide low frequency band, and excellent temperature compensation characteristics, the designed sensor could provide a reference for the design of like FBG acceleration sensors.
加速度传感器在桥梁、大坝、地震监测、地质勘探等领域发挥着重要作用。针对低频加速度传感器仍难以精确测量低频振动信号的问题，提出了一种结合旋转悬臂和弹簧的高灵敏度、宽低频带光纤布拉格光栅（FBG）加速度传感器。建立了传感器力学模型，并对其关键参数进行了理论分析和尺寸优化。利用ANSYS Workbench进行仿真分析，研制了物理传感器，并搭建了低频测试平台进行性能测试。实验结果表明，该传感器的固有频率为78 Hz，工作频段为1 - 55 Hz，灵敏度为1127.2 pm/g，横向抗干扰能力小于5.45%，动态范围为86.45 dB。所设计的传感器具有高灵敏度、宽低频带和优异的温度补偿特性，可为同类FBG加速度传感器的设计提供参考。
