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Related Experiment Video

Updated: Mar 19, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Two-dimensional fiber Bragg grating accelerometer with four identical cantilevers.

Meiya Zhang, Qiang Zhao, Peng Sun

    Applied Optics
    |March 17, 2026
    PubMed
    Summary

    This study presents a compact fiber Bragg grating acceleration sensor for 2D low-frequency vibration monitoring. The novel design offers high sensitivity and stability, making it ideal for challenging environments.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Mechanical Engineering and Vibration Analysis
    • Materials Science for Sensor Applications

    Background:

    • Miniaturization and enhanced sensitivity are critical for 2D low-frequency vibration monitoring.
    • Traditional sensors face limitations in space-constrained environments and susceptibility to electromagnetic interference.
    • Fiber Bragg Gratings (FBGs) offer potential for robust sensing solutions.

    Purpose of the Study:

    • To propose and validate a compact 2D fiber Bragg grating (FBG) acceleration sensor.
    • To achieve miniaturized design for space-constrained applications.
    • To suppress temperature cross-sensitivity and enhance measurement sensitivity for accurate vibration monitoring.

    Main Methods:

    • Utilized four identical cantilever beams as elastic sensing elements for the 2D FBG acceleration sensor.
    • Implemented differential signal processing on FBG central wavelength variations.
    • Conducted experimental analysis to determine resonant frequencies, sensitivity, linearity, crosstalk, and temperature sensitivity.

    Main Results:

    • Achieved stable operation in the 10-200 Hz range with resonant frequencies at 500 Hz (X-axis) and 525 Hz (Y-axis).
    • Demonstrated high sensitivities of 38.01 pm/g (X-axis) and 38.10 pm/g (Y-axis) with excellent linearity (r^2 > 0.99).
    • Reported low crosstalk ratios (11.6% and 13.7%) and minimal differential temperature sensitivity (1.7-2 pm/°C).

    Conclusions:

    • The developed compact 2D FBG acceleration sensor meets the demands for miniaturization and low-frequency vibration monitoring.
    • The sensor exhibits excellent performance characteristics, including high sensitivity, linearity, and temperature stability.
    • Its robust design makes it suitable for applications in space-constrained environments and areas with strong electromagnetic interference.