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Temperature compensated fiber optic magnetic sensor based on the combination interference principle.

Qi Yu, Xuegang Li, Xue Zhou

    Optics Letters
    |May 13, 2022
    PubMed
    Summary

    This study introduces a novel fiber optic magnetic field sensor using Sagnac and Mach-Zehnder combination interference (SMZI). The sensor accurately detects magnetic fields and temperature, overcoming cross-interference issues.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Sensor Technology

    Background:

    • Magnetic field and temperature (MFT) detection is crucial in various applications.
    • Existing sensors often suffer from cross-interference between magnetic field and temperature measurements.
    • Developing highly sensitive and temperature-compensated sensors remains a challenge.

    Purpose of the Study:

    • To propose and verify a novel fiber optic magnetic field sensor.
    • To achieve high sensitivity and temperature compensation for MFT detection.
    • To demonstrate the sensor's effectiveness in overcoming cross-influence.

    Main Methods:

    • Utilizing a Sagnac and Mach-Zehnder combination interference (SMZI) structure.
    • Employing a microstructured exposed core fiber (ECF) filled with ethanol and magnetic fluid (MF).
    • Leveraging the multimode and birefringence characteristics of ECF for sensing.

    Main Results:

    • Achieved a magnetic sensitivity of 1.17 nm/mT and temperature sensitivity of -1.93 nm/°C.
    • Demonstrated low detection limits of 0.41 mT for magnetic fields and 0.25°C for temperature.
    • Confirmed good repeatability and effective temperature compensation.

    Conclusions:

    • The proposed SMZI sensor effectively measures magnetic fields and temperature with high sensitivity.
    • The sensor successfully compensates for temperature cross-influence, offering intuitive spectral analysis.
    • This technology holds significant potential for MFT detection applications.