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Excessively tilted fiber grating-based vector magnetometer.

Tean Lu, Yuezhen Sun, Yarien Moreno

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    This study introduces a novel compact optic-fiber vector magnetometer using an excessively tilted fiber grating (Ex-TFG) and magnetic fluid (MF). The device offers high sensitivity for measuring magnetic field intensity and orientation without complex processing.

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    Area of Science:

    • Optoelectronics
    • Magnetometry
    • Fiber optics sensors

    Background:

    • Fiber optic sensors offer advantages like immunity to electromagnetic interference and remote sensing capabilities.
    • Existing fiber optic magnetometers often require complex structures or signal processing.
    • Magnetic fluids exhibit significant magneto-optical effects, making them suitable for magnetic field sensing.

    Purpose of the Study:

    • To propose and experimentally demonstrate a compact optic-fiber vector magnetometer.
    • To leverage the properties of excessively tilted fiber gratings (Ex-TFG) and magnetic fluids (MF) for enhanced magnetic field sensing.
    • To achieve high sensitivity and a low detection limit for magnetic field intensity and orientation.

    Main Methods:

    • Fabrication of an excessively tilted fiber grating (Ex-TFG).
    • Packaging the Ex-TFG with magnetic fluid (MF) to create a fiber optic sensor.
    • Experimental characterization of the sensor's response to magnetic field intensity and orientation using spectral interrogation.

    Main Results:

    • The developed magnetometer demonstrated high sensitivity to magnetic field perturbations.
    • Achieved magnetic field intensity sensitivity of 2.45 nm/mT and orientation sensitivity of 0.41 nm/deg.
    • A detection limit of approximately 8.1 μT for magnetic field intensity was reached with a wavelength measurement accuracy of 0.02 nm.

    Conclusions:

    • A compact and highly sensitive optic-fiber vector magnetometer based on Ex-TFG and MF has been successfully demonstrated.
    • The proposed sensor design offers a promising solution for precise magnetic field measurement without complicated signal processing.
    • This technology has potential applications in various fields requiring accurate vector magnetic field detection.