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Updated: Jul 13, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Probe-type all-fiber tiny-displacement sensor based on orbital-angular-momentum interferometry.

Hua Zhao, Chenji Guo, Jiayang Xu

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    |October 13, 2023
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    Summary
    This summary is machine-generated.

    This study introduces a novel fiber optic sensor for measuring tiny displacements. The all-fiber orbital-angular-momentum interferometer achieves high-resolution measurements down to 8.81 nm.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensing
    • Interferometry

    Background:

    • Precise measurement of minute displacements is crucial in various scientific and industrial fields.
    • Existing methods for tiny displacement measurement often face limitations in resolution, size, or environmental adaptability.
    • Orbital-angular-momentum (OAM) interferometry offers unique properties for wave manipulation and sensing.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel probe-type all-fiber sensor for high-precision tiny-displacement measurement.
    • To leverage the advantages of OAM interferometry and probe-type fiber sensing for enhanced measurement capabilities.
    • To establish a new benchmark for tiny displacement resolution using an all-fiber configuration.

    Main Methods:

    • Development of an all-fiber orbital-angular-momentum (OAM) interferometer.
    • Integration of a probe into the testing arm of the OAM interferometer to create a probe-type sensor.
    • Experimental validation of the sensor's performance for displacement measurements ranging from 0 nm to 750 nm.

    Main Results:

    • Successful experimental demonstration of the probe-type all-fiber OAM interferometer.
    • Achieved a real-time displacement resolution of approximately 8.81 nm.
    • Validated the sensor's capability to measure displacements in the nanometer range (0-750 nm).

    Conclusions:

    • The proposed probe-type all-fiber OAM interferometer is a viable and effective solution for tiny-displacement measurement.
    • This represents the first demonstration of an all-fiber probe-type OAM interferometer.
    • The technology holds potential for high-precision measurements in confined spaces and demanding applications.