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Related Experiment Video

Updated: Jun 12, 2026

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

Optimized weak fiber Bragg array interrogation system based on adaptive gain and polynomial fitting method.

Cailing Fu, Huafeng Zha, Ping Chen

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

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    This study presents an optimized interrogation system for 1000 Fiber Bragg Gratings (FBGs) using adaptive gain control. The system achieves precise demodulation by maintaining consistent reflection amplitudes and employing a superior polynomial fitting algorithm for wavelength analysis.

    Area of Science:

    • Optoelectronics
    • Fiber Optics Sensing

    Background:

    • Fiber Bragg Gratings (FBGs) are widely used in sensing applications.
    • Interrogation systems face challenges with fixed gain, leading to signal saturation or low amplitude for multiple FBGs.

    Purpose of the Study:

    • To develop an optimized interrogation system for a large number of FBGs.
    • To improve demodulation accuracy and stability in FBG sensing systems.

    Main Methods:

    • Implemented an adaptive gain control method to dynamically adjust the driving current of each FBG.
    • Utilized address scanning for independent control of individual FBGs.
    • Employed a polynomial fitting algorithm for wavelength demodulation.

    Main Results:

    • Successfully demodulated 1000 FBGs with -40 dB reflectivity and 1.5 m spacing.

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    Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
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    Published on: March 8, 2020

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    Last Updated: Jun 12, 2026

    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

    Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
    10:52

    Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

    Published on: March 8, 2020

  • Adaptive gain control maintained reflection amplitudes between -35 and -34 dBm.
  • Polynomial fitting demonstrated superior stability and consistency compared to centroid and Gaussian methods.

    • Conclusions:

    • The optimized WFBGA interrogation system effectively addresses challenges in demodulating multiple FBGs.
    • Adaptive gain control and polynomial fitting are crucial for high-performance FBG sensing.