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    This study introduces a novel fiber-optic accelerometer for detecting low-frequency vibrations. It offers high resolution and a wide dynamic range, reducing environmental instability for applications like coal and gas outburst warnings.

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    Area of Science:

    • Photonics
    • Sensor Technology
    • Vibration Measurement

    Background:

    • Low-frequency vibration detection is crucial for industrial safety.
    • Existing accelerometers often face challenges with environmental instability and complexity.

    Purpose of the Study:

    • To develop a robust fiber-optic accelerometer for low-frequency vibration signal detection.
    • To leverage polarization properties for enhanced sensing capabilities.

    Main Methods:

    • Utilized the differential effect of vibration signals on polarization eigenmode phase velocities.
    • Implemented an arctan demodulation scheme using orthogonal square roots of photovoltages.
    • Designed a fiber-optic sensor minimizing environmental instability and complexity.

    Main Results:

    • Achieved a flat response of 75.04 mrad/g.
    • Demonstrated an average resolution of 13.44 μg/√Hz.
    • Obtained a wide dynamic range of 111.62 dB below 180 Hz.

    Conclusions:

    • The proposed fiber-optic accelerometer offers high performance for low-frequency vibration detection.
    • Its reduced environmental instability and complexity make it suitable for critical safety applications.
    • Potential application in early warning systems for coal and gas outbursts.