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Updated: Oct 2, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Fiber optic jerk sensor.

Huicong Li, Wentao Zhang, Jianxiang Zhang

    Optics Express
    |February 25, 2022
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber optic jerk sensor (FOJS) directly measures jerk, avoiding acceleration differentiation noise. This innovation offers high sensitivity and broad applications in structural analysis and comfort evaluation.

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    Area of Science:

    • Optical sensing technologies
    • Mechanical engineering and vibration analysis
    • Structural health monitoring

    Background:

    • Jerk, the rate of change of acceleration, is critical for understanding structural damage and human comfort.
    • Traditional methods for jerk measurement often involve differentiating acceleration data, which is susceptible to high-frequency noise.
    • Direct jerk measurement is desirable for accurate analysis in dynamic systems.

    Purpose of the Study:

    • To propose and demonstrate a novel fiber optic jerk sensor (FOJS) for direct jerk measurement.
    • To investigate the sensing theory and design of the FOJS.
    • To validate the sensor's performance through experimental testing and comparison with existing methods.

    Main Methods:

    • Development of a fiber optic differentiating Mach-Zehnder interferometer for jerk sensing.
    • Direct demodulation of interference light phase to measure jerk.
    • Experimental validation including impact tests and comparison with a piezoelectric accelerometer.

    Main Results:

    • The proposed FOJS directly measures jerk by demodulating optical interference phase, effectively avoiding noise from acceleration differentiation.
    • Experimental and theoretical results show high sensitivity, an ultralow phase noise floor, a wide measuring range, and good linearity.
    • Impact tests confirm the FOJS's ability to directly measure jerk with good consistency compared to a standard accelerometer.

    Conclusions:

    • The fiber optic differentiating Mach-Zehnder interferometer provides a viable method for direct jerk measurement.
    • The FOJS demonstrates superior performance characteristics, including high sensitivity and noise immunity.
    • Potential applications include earthquake engineering, comfort evaluations, and railway design, marking a significant advancement in optical sensing for dynamic measurements.