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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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A Two-Step Guided Waves Based Damage Localization Technique Using Optical Fiber Sensors.

Rohan Soman1, Kaleeswaran Balasubramaniam1, Ali Golestani2

  • 1Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland.

Sensors (Basel, Switzerland)
|October 17, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel two-step guided waves (GW) technique using fiber Bragg grating (FBG) sensors for accurate structural damage detection and localization. The method overcomes FBG sensor limitations, improving reliability in structural health monitoring (SHM).

Keywords:
damage detectiondamage localizationedge filteringfiber Bragg grating (FBG) sensorsguided waves

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Area of Science:

  • Engineering
  • Materials Science
  • Physics

Background:

  • Structural health monitoring (SHM) is crucial for cost reduction and failure prevention in structures.
  • Guided waves (GW) offer a promising approach for SHM, but require reliable sensors.
  • Fiber Bragg grating (FBG) sensors are lightweight and robust but conventionally suffer from low signal-to-noise ratios and directional sensitivity.

Purpose of the Study:

  • To develop and validate a novel two-step guided waves (GW) based technique for damage detection and localization.
  • To overcome the limitations of conventional Fiber Bragg Grating (FBG) sensors in GW-based SHM.
  • To enhance the accuracy and reliability of damage detection and localization in structures.

Main Methods:

  • A two-step methodology employing guided waves (GW) and Fiber Bragg Grating (FBG) sensors.
  • Step 1: Amplitude-weighted elliptical approach to identify damage hotspots, addressing limited actuator-sensor (AS) pairs.
  • Step 2: Edge reflection-based ray-tracing approach for precise damage localization, overcoming directional sensitivity challenges.

Main Results:

  • The proposed two-step method accurately detects and localizes simulated damage on an aluminum plate.
  • The technique effectively overcomes the limitations of FBG sensors, including directional sensitivity and passive nature.
  • The methodology demonstrates improved reliability, minimizing false detections in structural health monitoring.

Conclusions:

  • The developed two-step GW technique using FBG sensors provides an accurate and reliable solution for structural damage localization.
  • This approach enhances the practical application of FBG sensors in SHM systems.
  • The study validates the efficacy of combining elliptical and ray-tracing methods for robust damage assessment.