悬臂梁
灵敏度(控制系统)
振动
加速度
材料科学
分析化学(期刊)
声学
物理
化学
电子工程
复合材料
工程类
色谱法
经典力学
作者
Hong Li,Rui Sun,Zhongchao Qiu,Zijie Han,Yanan Li
标识
DOI:10.1038/s41598-021-98055-z
摘要
Abstract The acquisition of 2–50 Hz low-frequency vibration signals is of great significance for the monitoring researches on engineering seismology, bridges & dams, oil & gas exploration, etc. A multi-cantilever beam low-frequency FBG acceleration sensor is proposed against the low sensitivity that predominates in the low-frequency vibration measurement by FBG acceleration sensors. Structural parameters of the sensor is subjected to simulation analysis and optimization design using the ANSYS software; the real sensor is developed based on the simulation results in the following manner: Three rectangular of the cantilever beams are evenly arranged around the mass block at 120°to improve the sensitivity and alleviate the transverse crosstalk of sensor; in the end, a performance test is performed on the sensor. According to the research findings, the sensor, whose natural frequency is approximately 64 Hz, is applicable for monitoring the low-frequency vibration signals within the range 16–54 Hz. The sensor sensitivity is approximately $$87.955\,{\text{pm/m}}\;{\text{s}}^{ - 2}$$ 87.955 pm/m s - 2 , the linearity being greater than 99%, the transverse interference immunity being lower than 2.58%, and the dynamic range being up to 86 dB. The findings offer a reference for developing sensor of the same type and further improving the sensitivity of fiber optic acceleration sensor.
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