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High-Density Distributed Crack Tip Sensing System Using Dense Ultra-Short FBG Sensors.

Xin Gui1,2, Zhengying Li3, Xuelei Fu4

  • 1School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China. guixin@whut.edu.cn.

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|April 13, 2019
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Summary
This summary is machine-generated.

This study introduces a dense ultra-short (DUS) fiber Bragg grating (FBG) array with an improved optical frequency domain reflectometry (OFDR) interrogator for precise crack tip sensing. The system accurately monitors strain distribution around cracks, enhancing structural integrity assessment.

Keywords:
crack tipdense ultra-short fiber Bragg gratingdistributed sensinghigh densityoptical fiber sensing

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Structural Health Monitoring

Background:

  • Crack initiation and propagation under stress concentration pose significant risks to structural integrity.
  • Accurate identification of crack tips and monitoring of surrounding strain fields are crucial for damage prevention.

Purpose of the Study:

  • To develop and validate a novel sensing system for high-density distributed crack tip sensing.
  • To achieve precise localization and strain monitoring around crack tips.

Main Methods:

  • Utilized a dense ultra-short (DUS) fiber Bragg grating (FBG) array coupled with an improved optical frequency domain reflectometry (OFDR) interrogator.
  • Implemented an adjacent grating interference correlation algorithm to enhance demodulation precision.
  • Employed a vertical-crossed layout to ensure comprehensive crack detection.

Main Results:

  • Achieved 1 mm spatial resolution and a 7.5 m detection distance for crack tip sensing.
  • Successfully located single, multiple, and oblique cracks experimentally.
  • Demonstrated high-resolution measurement of strain profiles around crack tips at various strain levels.

Conclusions:

  • The DUS-FBG system, enhanced by OFDR and a novel correlation algorithm, provides a feasible solution for high-density distributed crack tip sensing.
  • The system's ability to precisely locate crack tips and map strain fields validates its potential for structural health monitoring applications.