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A study on double-cantilever miniaturized FBG acceleration sensors for low-frequency vibration monitoring

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Abstract

The measurement of low-frequency vibration signals is of great significance for the studies on the seismic monitoring of railway transportation, bridges, and civil building structures. Aiming at the problem that the existing cantilever-type FBG acceleration sensors are difficult to effectively pickup low-frequency vibration signals and that they are large in size, a double cantilever beam-based miniaturized low-frequency FBG acceleration sensor is proposed. Firstly, the vibration model of the acceleration sensor is built, and its working principle is analyzed; secondly, the effect of structural parameters of the sensor on its sensitivity and natural frequency is analyzed, and the structural parameters of the sensor are optimized by the ANSYS simulation software; finally, the real sensor is developed, and a low-frequency vibration test system is set up to test the performance of the sensor. The experiment result suggests that the natural frequency of the sensor is about 71.4 Hz; the low-frequency vibration signals can be effectively picked up in the frequency range of 0.1–2 Hz; favorable linearity is observed in the operating frequency band of 2–50 Hz; the sensitivity is about 1022.8 pm/g, and the dynamic range is 74.5 dB; the transverse interference is not higher than 4.2%, and the volume is merely 7 cm3, which is significantly reduced compared to similar FBG acceleration sensors. The research findings provide a reference for the development of miniaturized low-frequency FBG accelerator sensors.

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Acknowledgements

This study was financially supported by the Science and Technology Innovation Program for Postgraduate students in IDP subsidized by Fundamental Research Funds for the Central Universities (Grant No. ZY20230323), the Fundamental Research Funds for the Central Universities (Grant No. ZY20215142), the 2020 Educational Research and Teaching Reform Project of the School of Disaster Prevention Science and Technology (Grant No. JY2020A12).

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Authors and Affiliations

  1. Institute of Disaster Prevention, Sanhe, 065201, Hebei, China

    Li Hong, Xi Wu, Qiang Gao, Chunming Pei & Kuaikuai Liu

  2. Hebei Key Laboratory of Seismic Disaster Instrument and Monitoring Technology, Sanhe, 065201, Hebei, China

    Li Hong, Xi Wu, Qiang Gao, Chunming Pei & Kuaikuai Liu

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  1. Li Hong
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  2. Xi Wu
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  3. Qiang Gao
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  4. Chunming Pei
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Correspondence to Qiang Gao.

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Hong, L., Wu, X., Gao, Q. et al. A study on double-cantilever miniaturized FBG acceleration sensors for low-frequency vibration monitoring. J Opt 53, 1282–1292 (2024). https://doi.org/10.1007/s12596-023-01294-8

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  • DOI: https://doi.org/10.1007/s12596-023-01294-8

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