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Related Experiment Video

Updated: Apr 21, 2026

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
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Temperature gradient sensor based on a long-fiber Bragg grating and time-frequency analysis.

A L Ricchiuti, D Barrera, K Nonaka

    Optics Letters
    |November 1, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a fiber Bragg grating (FBG) photonic sensor for detecting temperature gradients. The sensor achieves 1 mm spatial resolution, enabling precise position detection of thermal changes.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Fiber Optics

    Background:

    • Fiber Bragg gratings (FBGs) are widely used in optical sensing.
    • Accurate detection and localization of temperature gradients are crucial in various applications.
    • Existing methods may have limitations in spatial resolution or complexity.

    Purpose of the Study:

    • To present and validate a novel photonic sensor for detecting the presence and position of temperature gradients.
    • To achieve high spatial resolution in temperature gradient sensing.
    • To develop a simple and effective FBG-based sensing system.

    Main Methods:

    • Utilizing a 10-cm-long fiber Bragg grating (FBG) as the sensing element.
    • Employing time-frequency domain analysis to measure the central frequency distribution of the FBG.
    • Coupling a short optical pulse into the FBG and analyzing the back-reflected pulse using an oscilloscope.

    Main Results:

    • Experimental validation of the FBG-based photonic sensor.
    • Successful detection of temperature gradient presence and position.
    • Achieved a spatial resolution of 1 mm, determined by the input pulse duration.
    • Demonstrated a sensing range of 10 cm.

    Conclusions:

    • The proposed FBG sensor offers a simple yet effective solution for temperature gradient detection.
    • The system demonstrates high spatial resolution, enabling precise localization of thermal changes.
    • The sensing range can be further extended by using longer FBGs.