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    Area of Science:

    • Engineering
    • Physics
    • Materials Science

    Background:

    • Low-frequency vibration measurement is crucial for seismic monitoring, structural health assessment, and resource exploration.
    • Existing Fiber Bragg Grating (FBG) acceleration sensors exhibit low sensitivity in detecting low-frequency signals.

    Purpose of the Study:

    • To propose and develop a high-sensitivity, low-frequency dual-FBG acceleration sensor.
    • To optimize the sensor design for enhanced performance in low-frequency vibration detection.

    Main Methods:

    • Theoretical formula derivation and ANSYS software simulations were employed for structural parameter optimization.
    • A prototype sensor was fabricated based on simulation results.
    • A dedicated test system was established to evaluate sensor performance.

    Main Results:

    • The sensor exhibits a natural frequency of 65 Hz.
    • A flat sensitivity response was observed in the 3-45 Hz low-frequency band.
    • Key performance metrics include a dynamic range of 92.63 dB at 10 Hz, acceleration sensitivity of 1498.29 pm/g, linearity (R^2) of 0.9998, repeatability (RSD) of 1.75%, and transverse crosstalk of -33.99 dB.

    Conclusions:

    • The developed dual-FBG acceleration sensor demonstrates high sensitivity and excellent temperature compensation capabilities in the low-frequency band.
    • The sensor is well-suited for low- and medium-frequency vibration detection in various engineering applications.