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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Updated: Feb 15, 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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High-precision FBG sensor demodulation based on a tunable Michelson interferometer with parallel FBGs.

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    This summary is machine-generated.

    This study introduces a novel fiber Bragg grating (FBG) demodulation scheme using tunable FBGs and a Michelson interferometer. The system achieves exceptional accuracy for high-precision temperature and strain measurements.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Interferometry

    Background:

    • Fiber Bragg gratings (FBGs) are crucial for sensing applications.
    • High-precision demodulation is essential for accurate FBG-based measurements.
    • Existing methods face challenges in achieving both high speed and precision.

    Purpose of the Study:

    • To develop a high-precision signal demodulation scheme for FBGs.
    • To enhance the accuracy and speed of FBG-based sensing systems.
    • To leverage tunable FBGs and interferometry for improved wavelength shift reconstruction.

    Main Methods:

    • Utilized a Michelson interferometer (MI) with piezoelectric transducer (PZT) tuned co-located, multi-wavelength tunable FBGs (CMWT-FBGs).
    • Employed a Savitzky-Golay (S-G) fitting algorithm to precisely locate interference signal envelope peaks.
    • Reconstructed central wavelength variations of the sensing FBG by covering its wavelength shifts.

    Main Results:

    • Achieved a temperature accuracy of 1.33×10-6°C.
    • Demonstrated a strain accuracy of 1.04×10-5με.
    • The CMWT-FBGs-MI system showed a competitive advantage in high-speed and high-precision measurements.

    Conclusions:

    • The proposed scheme offers a significant advancement in FBG signal demodulation.
    • The system provides a robust platform for high-precision sensing applications.
    • This work supports further developments in advanced optical sensing technologies.