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Standing Waves in a Cavity01:28

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    This study introduces a low-cost, modulation-free fiber optic current sensor. It achieves high accuracy for direct current measurements and demonstrates effectiveness for alternating current detection.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Electromagnetics

    Background:

    • Traditional current sensors often require active modulation, increasing complexity and cost.
    • The Faraday effect in optical fibers provides a basis for non-invasive current sensing.
    • Developing modulation-free sensors is crucial for simplifying instrumentation and reducing power consumption.

    Purpose of the Study:

    • To present a novel modulation-free, low-cost fiber optic current sensor.
    • To investigate its performance for both direct current (DC) and alternating current (AC) measurements.
    • To analyze the sensor's noise characteristics.

    Main Methods:

    • Utilized a broadband light source and a single-mode linear resonant cavity.
    • Leveraged the Faraday effect to induce a phase difference in orthogonally polarized beams.
    • Employed a 3x3 coupler and balanced photodetector for signal demodulation without active modulation.

    Main Results:

    • Achieved a sensitivity of 1.749 mV/A for DC measurements.
    • Demonstrated a mean relative error below 0.2% within the 0-200 A range.
    • Confirmed the sensor's capability for detecting alternating current and analyzed its noise performance.

    Conclusions:

    • The proposed fiber optic current sensor offers a cost-effective and modulation-free solution.
    • It provides high accuracy for DC measurements and is suitable for AC detection.
    • The sensor design is promising for practical current monitoring applications.