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Updated: Dec 18, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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High-sensing-resolution distributed hot spot detection system implemented by a relaxed pulsewidth.

Jiaqi Wang, Zhengying Li, Xuelei Fu

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    |June 19, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel distributed hot spot detection method using ultra-weak fiber Bragg gratings (UWFBGs) and optical time-domain reflectometry (OTDR). The system reliably detects and locates small hot spots with high resolution, crucial for industrial monitoring.

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    Area of Science:

    • Fiber Optic Sensing
    • Industrial Monitoring
    • Materials Science

    Background:

    • Accurate detection of small hot spots is vital for industrial infrastructure safety.
    • Existing methods may lack the required resolution or reliability for early warning systems.

    Purpose of the Study:

    • To develop and demonstrate a practical, reliable distributed method for detecting weak and small hot spots.
    • To achieve high sensing and location resolution for industrial applications.

    Main Methods:

    • Utilized an array of ultra-weak fiber Bragg gratings (UWFBGs) with decreased grating spacing.
    • Employed optical time-domain reflectometry (OTDR) for interrogation.
    • Implemented wavelength-division multiplexing and a fiber section (FS) spectrum interrogation method.

    Main Results:

    • Successfully detected hot spots with a sensing resolution of 10 cm and location resolution of 1 m over 2 km.
    • Achieved temperature measurement precision of ±1°C within 1.5 seconds.
    • Demonstrated feasibility for early warning of centimeter-sized fire sources.

    Conclusions:

    • The proposed UWFBG and OTDR-based method offers a practical solution for distributed hot spot detection.
    • The system provides high resolution and accuracy suitable for critical industrial monitoring, such as in oil and gas pipelines.