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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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All-fiber, thermo-optic liquid level sensor.

Borut Preložnik, Dusan Gleich, Denis Donlagic

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    |September 7, 2018
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an all-optical-fiber sensor for continuous liquid level measurement. The sensor uses optical heating of vanadium-doped fiber to detect liquid levels with high resolution, suitable for industrial use.

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    Area of Science:

    • Fiber Optic Sensors
    • Optical Instrumentation
    • Metrology

    Background:

    • Accurate liquid level monitoring is crucial for industrial processes.
    • Existing liquid level sensors may have limitations in continuous measurement or harsh environments.

    Purpose of the Study:

    • To propose and demonstrate an all-optical-fiber sensor for continuous liquid level measurement.
    • To investigate the analytical relationship between liquid level and optical path length modulation.
    • To validate the sensor's performance through experimental measurements.

    Main Methods:

    • Utilized a vanadium-doped optical fiber configured as a Fabry-Perot interferometer.
    • Employed cyclic optical excitation (980 nm) for temperature modulation and path length variation.
    • Developed an interferometric approach for measuring amplitude changes related to liquid level.
    • Analyzed the thermal-optic response of the fiber to liquid immersion.

    Main Results:

    • Demonstrated two sensor versions with measurement ranges of 0.45 m and 1 m.
    • Achieved experimental level resolutions of approximately 2 mm and 3 mm for the respective ranges.
    • Validated a theoretical model showing good agreement with experimental data.
    • Confirmed the dependence of optical path length modulation amplitude on liquid level.

    Conclusions:

    • The proposed all-optical-fiber sensor offers a simple and efficient solution for continuous liquid level monitoring.
    • The sensor's design, utilizing readily available telecom components, facilitates industrial application.
    • The system demonstrates promising performance for various industrial liquid level sensing needs.