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Related Experiment Video

Updated: Jan 7, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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High-density fiber Bragg grating array enabling fully distributed sensing with sub-millimeter spatial resolution.

Koustav Dey, Ogbole Collins Inalegwu, Laura Bartlett

    Optics Letters
    |December 24, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel fiber Bragg grating (FBG) array for cost-effective, distributed sensing. This technology achieves sub-millimeter resolution, even in high-temperature environments, overcoming limitations of previous methods.

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    Area of Science:

    • Photonics and Optical Sensing
    • Materials Science
    • Instrumentation Engineering

    Background:

    • Distributed sensing with sub-millimeter resolution is crucial for industries like aerospace and manufacturing.
    • Current methods face challenges in cost-effectiveness and achieving high spatial resolution without gaps.

    Purpose of the Study:

    • To propose and demonstrate a novel staggered contiguous cladding fiber Bragg grating (SC-CLFBG) array for fully distributed sensing.
    • To achieve sub-millimeter spatial resolution in fiber Bragg grating sensing.
    • To validate the performance and thermal resilience of the proposed sensing configuration.

    Main Methods:

    • Fabrication of an FBG array using femtosecond laser direct inscription.
    • Development of a staggered contiguous cladding fiber Bragg grating configuration.
    • Experimental validation of the sensing array's spatial resolution and temperature performance.

    Main Results:

    • Achieved a spatial resolution of 800 μm over a 1.04 cm sensing length.
    • Demonstrated the first fully distributed FBG sensing with sub-millimeter resolution, eliminating dark zones.
    • Validated excellent performance and thermal resilience up to 710°C without hysteresis.
    • Recorded a maximum temperature sensitivity of 15.17 pm/°C.

    Conclusions:

    • The SC-CLFBG array offers a cost-effective and straightforward method for sub-millimeter distributed sensing.
    • The technology shows high signal fidelity and suitability for high-temperature applications.
    • This advancement holds significant promise for demanding sensing applications in aerospace, biomedical engineering, and additive manufacturing.