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Single-ring suspended fiber for Bragg grating based hydrostatic pressure sensing.

Lin Htein, Zhengyong Liu, Dinusha Gunawardena

    Optics Express
    |May 3, 2019
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    We developed a novel optical fiber sensor for high-sensitivity pressure measurements. This fiber Bragg grating (FBG) sensor exhibits the highest reported pressure sensitivity, making it ideal for demanding industrial applications.

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    Area of Science:

    • Optical Fiber Sensing
    • Materials Science
    • Photonics

    Background:

    • Standard single-mode fibers have limited sensitivity for pressure sensing.
    • Developing novel fiber structures is crucial for enhancing sensor performance.

    Purpose of the Study:

    • To introduce a novel suspended core optical fiber for enhanced pressure sensing.
    • To experimentally validate the pressure sensitivity of the novel fiber structure.

    Main Methods:

    • Fabrication of a novel optical fiber with a suspended germanium-doped core and silica rings.
    • Writing a Fiber Bragg Grating (FBG) in the novel fiber with a 65% air filling fraction.
    • Experimental measurement of Bragg wavelength shift under hydrostatic pressure.

    Main Results:

    • Achieved a hydrostatic pressure sensitivity of -43.6 pm/MPa, eleven times higher than standard fibers.
    • Experimental results closely matched numerical calculations (~40 pm/MPa).
    • Demonstrated the highest reported FBG-based pressure sensor sensitivity to date.

    Conclusions:

    • The novel suspended core fiber sensor offers superior pressure sensitivity.
    • The sensor is suitable for harsh environments like the oil industry and substance detection.