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Two Interrogated FBG Spectral Linewidth for Strain Sensing through Correlation.

Shih-Hsiang Hsu1, Kuo-Wei Chuang2, Ci-Syu Chen3

  • 1Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan. shsu@mail.ntust.edu.tw.

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Summary
This summary is machine-generated.

This study presents a novel fiber strain sensing method using cross-correlated fiber Bragg gratings (FBGs) and a delayed self-homodyne technique. The approach achieves high frequency resolution for precise strain measurement, demonstrating a sensitivity of 166 MHz/με.

Keywords:
correlationfiber Bragg gratingsfiber optics sensorsremote sensing and sensorsspectral linewidth

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensors
  • Materials Science

Background:

  • Fiber Bragg gratings (FBGs) are widely used for sensing applications.
  • Traditional FBG interrogation methods often rely on wavelength shifts.
  • Higher resolution strain sensing is crucial for advanced applications.

Purpose of the Study:

  • To develop and characterize a novel fiber strain sensing technique using spectral linewidth.
  • To investigate the use of cross-correlated FBGs with a delayed self-homodyne method.
  • To demonstrate enhanced resolution and sensitivity in fiber strain sensing.

Main Methods:

  • Interrogation and characterization of spectral linewidth from two cross-correlated FBGs.
  • Utilizing a delayed self-homodyne method for high-frequency resolution.
  • Employing an electric spectrum analyzer for spectral linewidth analysis.

Main Results:

  • Demonstrated a sensitivity of 166 MHz/με and a resolution of 50 nε.
  • Achieved 4 GHz spectral linewidth characterization.
  • Projected a 10 nε resolution with a reduced spectral linewidth of 1 GHz.
  • Observed a spectral broadening of 0.44 pm/με due to the photoelastic effect.

Conclusions:

  • The proposed method offers a viable alternative for high-resolution fiber strain sensing.
  • Spectral linewidth characterization provides a complementary approach to wavelength-based interrogation.
  • The photoelastic effect significantly influences FBG spectral broadening under strain.