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Displacement sensor based on cross-coupling method for high resolution and sensitivity using polymer optical fiber.

Abdul Ghaffar, Mujahid Mehdi, Rehan Mehdi

    Optics Express
    |December 19, 2025
    PubMed
    Summary

    This study introduces a novel polymer optical fiber displacement sensor. It achieves a 20mm range with high sensitivity and resolution, offering a cost-effective solution for monitoring applications.

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    Area of Science:

    • Photonics
    • Materials Science
    • Sensor Technology

    Background:

    • Traditional displacement sensors face trade-offs between resolution, sensitivity, and measurement range.
    • Increasing the measurement range often compromises sensor resolution and sensitivity.

    Purpose of the Study:

    • To develop a novel displacement sensor utilizing a spiral-structured polymer optical fiber.
    • To overcome the limitations of conventional sensors by enhancing sensitivity and measurement range.

    Main Methods:

    • A sensor design based on intensity modulation through bend-induced coupling in a spiral polymer optical fiber.
    • Utilizing a two-segment system: a primary spiral fiber for radiative loss and a secondary fiber for optical power coupling.
    • Employing a custom 3D-printed platform for precise alignment and controlled axial motion.

    Main Results:

    • Achieved a displacement measurement range of up to 20 mm.
    • Demonstrated high sensitivity (3.26 μW/mm) and resolution (30.67 nm).
    • Exhibited excellent repeatability and a stable response over the measurement range.

    Conclusions:

    • The proposed spiral polymer optical fiber sensor offers a compact, cost-effective, and flexible solution.
    • It effectively addresses the limitations of conventional displacement sensors.
    • Suitable for distributed displacement monitoring across diverse applications.