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Related Experiment Video

Updated: Oct 13, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

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Deep-learning-assisted fiber Bragg grating interrogation by random speckles.

Tianliang Wang, Yi Li, Jinchao Tao

    Optics Letters
    |November 15, 2021
    PubMed
    Summary

    This study introduces a novel method using random speckles and a quadrant detector for Fiber Bragg Grating (FBG) sensing. This approach achieves high-resolution and high-speed measurements for temperature and vibration, overcoming limitations of current FBG interrogation techniques.

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    Area of Science:

    • Optical Fiber Sensing
    • Photonics
    • Signal Processing

    Background:

    • Fiber Bragg Gratings (FBGs) are crucial for sensing temperature, strain, and vibration.
    • Existing FBG interrogation methods struggle with sensitivity, speed, and cost.

    Purpose of the Study:

    • To develop a novel, cost-effective, and high-performance FBG demodulation scheme.
    • To address the limitations of conventional FBG interrogation techniques.

    Main Methods:

    • Utilized random speckles as carriers for FBG reflection spectrum information.
    • Employed a quadrant detector (QD) for speckle pattern recording, compressing data into four channels.
    • Applied a deep convolution neural network (CNN) for precise spectral feature extraction from compressed signals.

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    Last Updated: Oct 13, 2025

    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
    08:23

    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

    Published on: September 30, 2019

    6.4K
    Writing Bragg Gratings in Multicore Fibers
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    Published on: April 20, 2016

    8.3K
    Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures
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    Main Results:

    • Demonstrated high-resolution temperature and vibration measurements with a resolution of 1.2 pm.
    • Successfully extracted FBG spectral features using QD-recorded speckle patterns and CNN analysis.
    • Achieved high-resolution and high-speed measurement capabilities.

    Conclusions:

    • The novel speckle-based demodulation scheme offers a promising alternative for optical fiber sensing.
    • This method addresses key challenges in FBG interrogation, enabling advanced sensor applications.
    • Paves a new direction for high-performance optical fiber sensors.