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Updated: Jun 16, 2025

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Distributed salinity sensor based on optical frequency domain reflectometry with polyimide coated single mode fiber.

Chao Ping Liang, Zhuo Song, Hong Dong Chen

    Optics Express
    |June 14, 2025
    PubMed
    Summary

    This study introduces a novel optical fiber sensor for measuring salinity. The polyimide-coated sensor demonstrates high sensitivity and accuracy, offering potential for oceanographic and chemical sensing applications.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Chemical Sensing

    Background:

    • Accurate salinity measurements are critical for oceanography and environmental monitoring.
    • Existing salinity sensors may have limitations in sensitivity, response time, or applicability in diverse conditions.

    Purpose of the Study:

    • To propose and analyze a distributed optical fiber sensor for salinity sensing.
    • To investigate the performance of polyimide-coated optical fibers for salinity detection.

    Main Methods:

    • Fabrication of polyimide-coated single-mode optical fibers.
    • Utilizing optical frequency domain reflectometry (OFDR) for sensing.
    • Characterizing sensor sensitivity and response to varying salinity levels.

    Main Results:

    • Polyimide coating thickness influences sensor sensitivity.
    • Sensitivities ranging from -21.71 GHz/(mol/L) to -42.78 GHz/(mol/L) were achieved.
    • Minimum salinity measurement uncertainty of 0.05 mol/L was demonstrated.

    Conclusions:

    • The developed optical fiber sensor exhibits high sensitivity for salinity detection.
    • The sensor shows promise for real-time ocean parameter observation and ion chemical sensing.