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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Compact Tb doped fiber optic current sensor with high sensitivity.

Duanni Huang, Sudharsanan Srinivasan, John E Bowers

    Optics Express
    |December 25, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber optic current sensor utilizes terbium-doped fiber for high sensitivity. This sensor achieves a minimum detectable current of 0.1mA, showing promise for compact, power-efficient applications.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Materials Science

    Background:

    • Traditional current sensors face limitations in sensitivity and size.
    • Fiber optic sensors offer potential for enhanced performance in electrical measurements.

    Purpose of the Study:

    • To present a highly sensitive fiber optic current sensor.
    • To characterize the performance of terbium-doped fiber for current sensing applications.

    Main Methods:

    • Utilized a polarimetric and interferometric approach to determine the Verdet constant of terbium-doped fiber at 1300nm.
    • Implemented a Sagnac-loop sensor with 10cm of terbium-doped fiber within a solenoid.
    • Extrapolated sensor performance for practical configurations.

    Main Results:

    • The Verdet constant of terbium-doped fiber was measured at 19.5μrad/A.
    • The Sagnac-loop sensor demonstrated over 40dB open-loop dynamic range.
    • A minimum detectable current of 0.1mA was achieved, with projected noise limits of 22mA/√Hz for optimal configurations.

    Conclusions:

    • Terbium-doped fiber optic sensors offer high sensitivity for current measurement.
    • The developed sensor is suitable for applications demanding high sensitivity and reduced size, weight, and power.
    • Further optimization suggests practical configurations can achieve excellent noise performance.