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Miniature bending-resistant fiber grating accelerometer based on a flexible hinge structure.

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    A new miniaturized fiber Bragg grating accelerometer uses flexible hinges for compact vibration monitoring. This sensor is ideal for aerospace applications requiring high-quality measurements in confined spaces.

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    Area of Science:

    • Sensor Technology
    • Optical Engineering
    • Mechanical Engineering

    Background:

    • Vibration monitoring requires accelerometers with specific size and quality constraints.
    • Existing accelerometers may not meet the demands for miniaturization and performance in specialized applications.

    Purpose of the Study:

    • To propose and analyze a miniaturized fiber Bragg grating accelerometer for vibration monitoring.
    • To address the challenges of size reduction and signal integrity in accelerometer design.

    Main Methods:

    • Utilized a flexible hinge as the elastic body for miniaturization.
    • Employed a suspended arc package and bending-resistant optical fiber to minimize light loss.
    • Conducted theoretical analysis, simulation, and experimental validation of the accelerometer's characteristics.

    Main Results:

    • Developed an accelerometer with physical dimensions of 17mm x 12mm x 10mm and a mass of 4.44g.
    • Achieved a resonant frequency of approximately 900Hz.
    • Demonstrated a sensitivity of 26.962 pm/g within the 20-400Hz range, with less than 5% lateral interference.

    Conclusions:

    • The proposed fiber Bragg grating accelerometer offers a viable solution for miniaturized vibration monitoring.
    • Its compact size and performance characteristics make it suitable for medium and low-frequency vibration monitoring in confined aerospace environments.