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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Long-range multicore optical fiber displacement sensor.

Monserrat C Alonso-Murias, David Monzón-Hernández, Osvaldo Rodríguez-Quiroz

    Optics Letters
    |April 30, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel long-range optical fiber displacement sensor using a strongly coupled multicore fiber (SCMCF) extrinsic Fabry-Perot interferometer (EFPI). The new sensor achieves a significantly larger dynamic measurement range and high resolution for precise displacement detection.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Optical Fiber Sensors
    • Interferometry

    Background:

    • Extrinsic Fabry-Perot interferometers (EFPIs) are widely used for displacement sensing.
    • Conventional EFPIs using single-mode fibers (SMFs) have limitations in dynamic range and signal intensity.
    • Multicore fibers offer unique light-guiding properties that can be leveraged for enhanced sensor performance.

    Purpose of the Study:

    • To propose and demonstrate a novel long-range optical fiber displacement sensor.
    • To utilize a strongly coupled multicore fiber (SCMCF) within an EFPI configuration.
    • To enhance the dynamic measurement range and resolution of optical fiber displacement sensors.

    Main Methods:

    • Fabrication of an EFPI sensor by splicing a short section of SCMCF to a conventional SMF.
    • Analysis of the sensor's reflection spectrum, considering super-mode interference in SCMCF and EFPI interference.
    • Utilizing Fourier domain analysis of the interference pattern to quantify displacement.

    Main Results:

    • The developed sensor successfully measures displacements up to 50 mm with a resolution of approximately 500 nm.
    • The SCMCF-based EFPI exhibits a dynamic measurement range at least seven times larger than conventional SMF-based EFPIs.
    • Sufficient signal intensity is achievable for displacements of several centimeters due to the efficient light-collecting area of the SCMCF.

    Conclusions:

    • This work presents the first demonstration of a multicore fiber-based displacement sensor.
    • The proposed SCMCF-EFPI sensor offers a robust, easily fabricated, and replicable solution with significantly improved performance.
    • This technology holds promise for advanced long-range and high-resolution displacement sensing applications.