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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Fiber-based distributed bolometry.

Regina Magalhães, Andres Garcia-Ruiz, Hugo F Martins

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    This study introduces the first optical fiber-based distributed bolometer for sensing optical radiation. The novel sensor uses a special fiber coating and phase-sensitive reflectometry to detect irradiance changes with high sensitivity.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Optical Fiber Sensing
    • Distributed Measurement Systems

    Background:

    • Optical fibers typically minimize light interaction with surroundings, limiting their use in radiation sensing.
    • Existing optical radiation sensing methods lack distributed capabilities over long distances.
    • Applications like Dynamic Line Rating (DLR) and thermo-solar energy require sensitive, distributed optical radiation monitoring.

    Purpose of the Study:

    • To demonstrate the proof-of-concept for a novel distributed optical radiation sensor based on optical fiber technology.
    • To develop a system capable of detecting absolute changes in irradiance with high sensitivity.
    • To overcome the inherent limitations of optical fibers in radiation sensing applications.

    Main Methods:

    • Utilizing optical fibers with a specialized high-emissivity coating (e.g., carbon or black paint) to enhance absorption.
    • Employing phase-sensitive reflectometry to detect temperature variations induced by absorbed optical radiation.
    • Interrogating black-coated optical fibers using chirped-pulse ΦOTDR (frequency-modulated continuous-wave optical time-domain reflectometry).

    Main Results:

    • Successfully demonstrated the detection of absolute changes in optical irradiance using the developed fiber optic system.
    • Achieved a detection resolution of approximately 1% of the reference solar irradiance.
    • Validated the potential of the technology for distributed sensing over large areas.

    Conclusions:

    • The developed optical fiber bolometer represents a significant advancement in distributed optical radiation sensing.
    • The system offers high sensitivity and potential for integration into applications requiring real-time irradiance monitoring.
    • This technology paves the way for enhanced monitoring in energy transmission and solar energy sectors.