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Fiber Bragg Grating Array for Shape Reconstruction in Structural Elements.

Edson A Souza1, Leandro C Macedo2, Anselmo Frizera2

  • 1Mechanical Engineering Department, Federal University of Espírito Santo, Vitória 29075-910, Espirito Santo, Brazil.

Sensors (Basel, Switzerland)
|September 9, 2022
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Summary
This summary is machine-generated.

A novel fiber Bragg grating (FBG) array enables accurate two-dimensional (2D) shape reconstruction in structural elements. This sensor array offers direct embedment and reliable real-time performance for structural health monitoring.

Keywords:
fiber Bragg gratingsoptical fiber sensorsshape reconstruction

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Area of Science:

  • Structural Health Monitoring
  • Optical Fiber Sensing
  • Materials Science

Background:

  • Accurate structural shape reconstruction is crucial for monitoring the integrity of engineering components.
  • Fiber Bragg gratings (FBGs) offer a promising sensing technology due to their immunity to electromagnetic interference and multiplexing capabilities.
  • Existing methods often face challenges with temperature cross-sensitivity and complex implementation.

Purpose of the Study:

  • To develop and validate a fiber Bragg grating (FBG) array for precise two-dimensional (2D) shape reconstruction of cantilever beams.
  • To investigate the strain distribution in wooden and nylon beams under load using finite element analysis.
  • To implement a temperature compensation strategy to enhance deflection analysis accuracy.

Main Methods:

  • Development of a 5-FBG array for measuring strain and reconstructing shape.
  • Finite element method (FEM) analysis for simulating strain distribution in Pinus wood and Nylon 6.0 beams.
  • Implementation of a temperature compensation technique using an additional FBG sensor.
  • Experimental validation of the FBG array's linearity and shape reconstruction accuracy.

Main Results:

  • The FBG array demonstrated high linearity (R² > 0.995) in deflection experiments.
  • The proposed temperature compensation method effectively decoupled temperature effects.
  • 2D shape reconstruction results closely matched theoretical and numerical analyses (R² > 0.99).
  • The sensor array achieved accurate elastic line estimation for analyzed beams.

Conclusions:

  • The developed FBG array is a feasible and effective solution for real-time 2D shape reconstruction of structural elements.
  • Direct embedment capability offers practical advantages for integrated structural monitoring.
  • The system provides reliable performance with high accuracy and linearity, even with temperature variations.