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High-Speed Interrogation for Large-Scale Fiber Bragg Grating Sensing.

Chenyuan Hu1, Wei Bai2

  • 1MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China. chenyuanhu@hust.edu.cn.

Sensors (Basel, Switzerland)
|March 3, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a fast fiber Bragg grating (FBG) sensing system using parallel computing. The novel technique achieves rapid interrogation speeds and high wavelength demodulation stability for large-scale FBG arrays.

Keywords:
fiber Bragg gratingsfiber optics sensorsmodulationmultiplexing

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Area of Science:

  • Photonics and Sensing Technology
  • Optical Engineering
  • Signal Processing

Background:

  • Fiber Bragg Grating (FBG) sensors are crucial for large-scale sensing applications.
  • Existing interrogation schemes face limitations in speed and scalability for dense FBG arrays.
  • High-speed and stable demodulation is essential for real-time monitoring in various fields.

Purpose of the Study:

  • To develop a high-speed interrogation scheme for large-scale Fiber Bragg Grating (FBG) sensing arrays.
  • To improve the efficiency and accuracy of FBG signal demodulation.
  • To demonstrate the feasibility of a parallel computing and pipeline control based approach.

Main Methods:

  • Utilized parallel computing and pipeline control for light modulation and signal demodulation.
  • Employed an Electro-optic modulator (EOM) and a semiconductor optical amplifier (SOA) for spectral filtering.
  • Implemented a Field-Programmable Gate Array (FPGA) based system for real-time processing.

Main Results:

  • Achieved a fastest interrogation delay time of approximately 27.2 µs for a single FBG.
  • System scanning period is primarily limited by optical transmission delay in the sensing fiber.
  • Demonstrated a verified FBG wavelength demodulation stability of ±1 pm without averaging.

Conclusions:

  • The proposed high-speed interrogation scheme significantly enhances the performance of FBG sensing arrays.
  • The FPGA-based technique offers rapid, stable, and scalable wavelength demodulation.
  • This advancement enables more efficient real-time monitoring in demanding applications.