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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Stray current sensor with cylindrical twisted fiber.

Shaoyi Xu, Wei Li, Yuqiao Wang

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    A novel stray current sensor utilizes a cylindrical twisted fiber to enhance accuracy. This fiber design effectively suppresses temperature-induced birefringence, improving sensor performance and reliability.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Metrology

    Background:

    • Stray current sensing is crucial in various industries.
    • Birefringence in optical fibers can introduce significant errors.
    • Temperature fluctuations exacerbate birefringence, impacting sensor accuracy.

    Purpose of the Study:

    • To propose and validate a stray current sensor employing a cylindrical twisted fiber.
    • To quantify and mitigate linear birefringence caused by temperature.
    • To assess the impact of circular birefringence generated by the twisted fiber.

    Main Methods:

    • Demonstration of a quantitative method for linear birefringence measurement.
    • Development of a polarization division multiplexing model to determine required circular birefringence.
    • Simulation and experimental validation of the cylindrical twisted fiber's performance.

    Main Results:

    • Temperature-induced linear birefringence measured at 4.63 deg/m at 60°C.
    • Simulated circular birefringence of 2116.9 deg, sufficient to suppress linear birefringence.
    • Linear birefringence error controlled within 0.945×10⁻⁵ /°C.
    • Sensor repeatability of 0.367% and sensitivity of 0.0261/A.

    Conclusions:

    • The cylindrical twisted fiber effectively suppresses temperature-induced linear birefringence.
    • The proposed sensor design significantly improves accuracy, repeatability, and sensitivity.
    • This technology offers a reliable solution for precise stray current detection.