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Related Experiment Video

Updated: Jun 24, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Highly stabilized fiber Bragg grating accelerometer based on cross-type diaphragm.

Heming Wei, Changquan Zhuang, Jiawei Che

    Optics Express
    |June 11, 2024
    PubMed
    Summary
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    A novel fiber Bragg grating (FBG) accelerometer with a cross-type diaphragm offers high sensitivity and stability for structural health monitoring. This optimized FBG accelerometer demonstrates a wide frequency bandwidth and strong anti-interference capabilities.

    Area of Science:

    • Optoelectronics
    • Mechanical Engineering
    • Sensor Technology

    Background:

    • Fiber Bragg Gratings (FBGs) are increasingly utilized in sensing applications due to their immunity to electromagnetic interference and multiplexing capabilities.
    • Accelerometers are crucial for measuring acceleration in various fields, including structural health monitoring.
    • Existing accelerometer designs often face challenges in balancing sensitivity, stability, and bandwidth.

    Purpose of the Study:

    • To propose and design a novel fiber Bragg grating (FBG) accelerometer utilizing a cross-type diaphragm structure.
    • To optimize the accelerometer design for enhanced sensitivity and stability.
    • To evaluate the performance characteristics of the developed FBG accelerometer.

    Main Methods:

    • Design and fabrication of an FBG accelerometer incorporating a cross-beam as the spring element.

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  • Structural optimization of the accelerometer to achieve a balance between sensitivity and stability.
  • Experimental testing to determine resonant frequency, frequency bandwidth, sensitivity, linearity, and cross-error.

    • Main Results:

    • The designed FBG accelerometer achieved a resonant frequency of 556 Hz and a wide frequency bandwidth of up to 200 Hz.
    • Sensitivity was measured at 12.35 pm/g at 100 Hz with a high linear correlation coefficient of 0.99936.
    • The device exhibited a maximal cross-error of less than 3.26%, indicating strong anti-interference capability.

    Conclusions:

    • The proposed cross-type diaphragm FBG accelerometer offers a simple structure and robust performance.
    • The device's characteristics make it suitable for mechanical structural health monitoring applications.
    • The optimized design successfully balances sensitivity and stability, meeting performance requirements for vibration sensing.