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3 × 3 coupler based interferometric magnetic field sensor using a TbDyFe rod.

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    This study presents an all-fiber magnetic field sensor using a TbDyFe rod for weak alternating magnetic field measurement. The novel sensor achieves high sensitivity and resolution, demonstrating excellent linearity and reversibility.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Sensor Technology

    Background:

    • Accurate measurement of weak alternating magnetic fields is crucial in various scientific and industrial applications.
    • Existing magnetic field sensors may face limitations in sensitivity, resolution, or operating conditions.

    Purpose of the Study:

    • To develop and demonstrate an all-fiber magnetic field sensor for measuring weak alternating magnetic fields.
    • To utilize Terfenol-D (TbDyFe) as the sensing element within a Mach-Zehnder interferometer configuration.

    Main Methods:

    • Fabrication of an all-fiber sensor incorporating a Terfenol-D rod within a Mach-Zehnder interferometer.
    • Employing a passive demodulation method to recover the time-varying phase shift induced by the magnetic field.
    • Experimental characterization of sensor performance, including linearity, reversibility, sensitivity, resolution, frequency response, and temperature characteristics.

    Main Results:

    • The sensor demonstrated excellent linearity and reversibility within the 0-75 μT range.
    • A high sensitivity of 69.83 mrad/μT was achieved.
    • A notable resolution of 2.14 nT/√Hz at 200 Hz was experimentally determined.
    • Frequency response and temperature characteristics were investigated.

    Conclusions:

    • The presented all-fiber magnetic field sensor based on Terfenol-D is a viable technology for weak alternating magnetic field detection.
    • The sensor exhibits promising performance metrics, including high sensitivity and resolution.
    • Further investigation into its frequency and temperature characteristics provides a comprehensive understanding of its operational capabilities.