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Simultaneous temperature and refractive index sensor based on an L-like Michelson interferometer.

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    Researchers developed a novel L-like Michelson interferometer (MI) for precise temperature and refractive index (RI) sensing. This cost-effective fiber optic sensor offers high sensitivity for various measurement applications.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensing
    • Interferometry

    Background:

    • Fiber optic sensors are crucial for environmental monitoring.
    • Michelson interferometers (MIs) offer high sensitivity but can be complex to fabricate.
    • Developing robust and cost-effective sensing platforms is an ongoing challenge.

    Purpose of the Study:

    • To experimentally demonstrate a novel L-like Michelson interferometer (MI) for simultaneous temperature and refractive index (RI) sensing.
    • To compare the performance of MIs fabricated with single-mode fiber (SMF) and multimode fiber (MMF).
    • To optimize sensor parameters for enhanced measurement accuracy.

    Main Methods:

    • Fabrication of two L-like MIs using SMF and MMF via an oxyhydrogen flame.
    • Utilizing a rotatable platform for precise sensor construction.
    • Conducting comparative experiments to determine optimal sensor size and bend degree.
    • Characterizing sensor performance for temperature and RI sensitivity.

    Main Results:

    • The SMF L-like MI achieved an RI sensitivity of -131.0 nm/RIU and a temperature sensitivity of 94.17 pm/°C.
    • The MMF L-like MI demonstrated a higher RI sensitivity of 176.5 nm/RIU and a temperature sensitivity of 104.2 pm/°C.
    • Optimized sensor parameters led to excellent sensing performance.

    Conclusions:

    • The novel L-like MI is a promising, low-cost, and easily fabricated sensor for simultaneous temperature and RI measurements.
    • Both SMF and MMF configurations exhibit high sensitivity, suitable for diverse applications.
    • The L-like MI design offers a practical solution for advanced optical sensing.