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Updated: Aug 25, 2025

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Ultra-sensitive micro-displacement sensor based on a U-shaped bent SMF.

Shuying Li, Feng Wu, Yu Liu

    Applied Optics
    |October 18, 2022
    PubMed
    Summary

    Researchers developed an equivalent arc model for U-shaped optical fiber sensors. This model accurately measures micro-displacements, achieving ultra-high sensitivity for advanced sensing applications.

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    Area of Science:

    • Optical fiber sensing
    • Micro-displacement measurement
    • Nanotechnology

    Background:

    • Irregularly shaped bent optical fiber sensors are of significant interest.
    • Accurate determination of effective interference length and bent radius in these devices remains a challenge.

    Purpose of the Study:

    • To propose an equivalent arc model for U-shaped optical fiber devices.
    • To accurately define the effective interference length and bent radius.
    • To enable ultra-sensitive micro-displacement sensing.

    Main Methods:

    • An equivalent arc model was developed to represent U-shaped optical fiber.
    • The model relates effective interference length to structural height.
    • This enabled the realization of a novel micro-displacement sensor.

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    Main Results:

    • The effective interference length shows significant variation with structural height changes.
    • An ultra-sensitive micro-displacement sensor was realized with a sensitivity of -1.2838 nm/µm.
    • The sensor operates within a measurement range of 0-60 µm.

    Conclusions:

    • The equivalent arc model provides accurate parameters for U-shaped fiber devices.
    • The developed sensor exhibits sensitivity one order of magnitude higher than previous work.
    • The model's analysis strategy is applicable to various irregular bent fiber sensors and other sensing fields.