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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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High resolution and large sensing range liquid level measurement using phase-sensitive optic distributed sensor.

Qi Liu, Tao Liu, Tao He

    Optics Express
    |May 14, 2021
    PubMed
    Summary
    This summary is machine-generated.

    A novel distributed optical fiber liquid level sensor uses phase-sensitive optical time domain reflectometry (φ-OTDR) and thermal optic effects for precise industrial monitoring. This sensor achieves high resolution and a large dynamic range, benefiting smart industry and biomedicine.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Metrology

    Background:

    • Accurate liquid level sensing is crucial for industrial monitoring.
    • Existing sensors often lack the required range and resolution.
    • Distributed sensing offers advantages for large-scale applications.

    Purpose of the Study:

    • To propose and demonstrate a distributed optical fiber liquid level sensor.
    • To achieve high resolution and a large sensing range.
    • To leverage the thermal optic effect for liquid level detection.

    Main Methods:

    • Utilizing phase-sensitive optical time domain reflectometry (φ-OTDR).
    • Employing the thermal optic effect: temperature differences alter refractive index and optical path.
    • Using scattering enhanced optical fiber (SEOF) for improved signal-to-noise ratio (SNR).
    • Designing a high-sensitivity sensing head with a heat-conductive cylinder.

    Main Results:

    • Achieved a high sensitivity of 73.4 rad/mm.
    • Demonstrated a liquid level resolution of 142μm.
    • Validated a large sensing range of 20 cm, with potential up to 320 m.
    • Obtained a dynamic range of 127.1 dB.

    Conclusions:

    • The proposed distributed optical fiber sensor offers high resolution and a large dynamic range.
    • It effectively utilizes the thermal optic effect for liquid level measurement.
    • Potential applications include smart industry platforms and biomedicine monitoring.