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Sensitivity Enhancement of FBG-Based Strain Sensor.

Ruiya Li1,2, Yiyang Chen3, Yuegang Tan4

  • 1School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China. liruiya@whut.edu.cn.

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|May 19, 2018
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Summary

A novel fiber Bragg grating (FBG) strain sensor uses a lever structure to amplify strain, significantly boosting sensitivity. This high-sensitivity sensor is ideal for precise micro-strain measurements in demanding industrial settings.

Keywords:
fiber Bragg gratinglever structuresensitivity enhancementstrain

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Area of Science:

  • Optical Sensing
  • Mechanical Engineering
  • Materials Science

Background:

  • Fiber Bragg Gratings (FBGs) are widely used for strain sensing.
  • Enhancing the sensitivity of FBG sensors is crucial for micro-strain measurements.
  • Existing FBG sensors may lack sufficient sensitivity or dynamic range for certain applications.

Purpose of the Study:

  • To develop a novel high-sensitivity Fiber Bragg Grating (FBG)-based strain sensor.
  • To enhance the strain sensitivity of FBG sensors using a mechanical lever structure.
  • To investigate the theoretical and experimental performance of the developed sensor.

Main Methods:

  • Designing and fabricating an FBG sensor integrated with a lever-based mechanical amplification structure.
  • Developing and validating a theoretical model for the strain-amplifying mechanism.
  • Conducting experimental tests to measure strain sensitivity and dynamic characteristics.
  • Utilizing Finite Element Method (FEM) for dynamic characteristic analysis.

Main Results:

  • The developed FBG strain sensor achieved a high strain sensitivity of 6.2 pm/με.
  • The sensor's sensitivity is 5.2 times greater than that of a bare FBG sensor.
  • The sensor demonstrated a high resonant frequency and a wide dynamic working range due to its high-stiffness mechanical configuration.
  • Experimental results closely matched theoretical predictions.

Conclusions:

  • The novel lever-structured FBG sensor significantly enhances strain sensitivity.
  • The sensor offers a high dynamic range and resonant frequency, suitable for harsh environments.
  • This high-sensitivity FBG sensor is a promising solution for micro-strain measurements in industrial applications.