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A low-frequency FBG accelerometer based on dual mass

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Abstract

The accurate measurement of low-frequency signal is the main research focus at present. Aiming at the problem that FBG accelerometer is difficult to measure vibration signal efficiently, we propose a low-frequency FBG accelerometer based on dual mass. Build the vibration model of the sensor, derive the theoretical formula of the sensitivity and resonant frequency, and use COMSOL software to optimize the design and simulation of the key parameters. According to the theoretical analysis results of finite element verification, the sensor is manufactured and its performance is tested. The experimental results show that the transverse crosstalk of the sensor is − 28.07 dB, the relative standard deviation of repeatability is 0.90%, the fitting determination coefficient R2 is 99.98%, the sensitivity is 1194.91 pm/g, the dynamic range is 81.55 dB, the working frequency range is 1–40 Hz, and the inherent frequency is 58 Hz. In the low frequency band, the developed sensor exhibits good stability and sensitivity. This design provides a reference for the application of FBG accelerometer in low-frequency exploration.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This study was financially supported by the National Key Research and Development Program of China (Grant No. 2019YFC1509504), the Hebei Key Laboratory of Seismic Disaster Instrument and Monitoring Technology (Grant No. FZ224103), and the Fundamental Research Funds for the Central Universities (Grant No. ZY20215101).

Funding

National Key Research and Development Program of China, 2019YFC1509504, Yuntian Teng, Hebei Key Laboratory of Seismic Disaster Instrument and Monitoring Technology, FZ224103, Zhongchao Qiu, Fundamental Research Funds for the Central Universities, ZY20215101, Menglin Mai.

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Authors and Affiliations

  1. Institute of Geophysics, China Earthquake Administration, Bei**g, 100081, China

    Zhongchao Qiu, **aomei Wang, Yuntian Teng & Zhaobo He

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

    Zhongchao Qiu, **aomei Wang, Menglin Mai & Yuntian Teng

  3. Institute of Disaster Prevention, Sanhe, 065201, China

    Zhongchao Qiu, **aomei Wang, Menglin Mai & Yuntian Teng

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  1. Zhongchao Qiu
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  2. **aomei Wang
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  3. Menglin Mai
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  4. Yuntian Teng
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  5. Zhaobo He
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Correspondence to Menglin Mai.

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Qiu, Z., Wang, X., Mai, M. et al. A low-frequency FBG accelerometer based on dual mass. J Opt 52, 2264–2274 (2023). https://doi.org/10.1007/s12596-023-01139-4

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