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Defect imaging for plate-like structures using diffuse field.

Takahiro Hayashi1

  • 1Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan hayashi@kuaero.kyoto-u.ac.jp.

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Summary
This summary is machine-generated.

Scanning laser source (SLS) defect imaging was improved using diffuse field concepts to reduce spurious images. Broadband chirp excitation and low-attenuation materials yield clearer defect imaging results.

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Area of Science:

  • Non-destructive testing
  • Wave physics
  • Materials science

Background:

  • Scanning laser source (SLS) techniques can image defects in plate-like structures.
  • Resonances and reverberations within specimens can create spurious images, hindering accurate defect detection.
  • Reducing spurious images is crucial for reliable defect characterization.

Purpose of the Study:

  • To develop an improved defect imaging method using SLS by incorporating diffuse field concepts.
  • To reduce the intensity of spurious images in SLS defect imaging.
  • To investigate the influence of excitation waves and material properties on image clarity.

Main Methods:

  • Utilized diffuse field concepts within the SLS technique to estimate flexural wave energy.
  • Employed broadband excitation using a chirp wave.
  • Tested specimens with varying attenuation properties.

Main Results:

  • The application of diffuse field concepts effectively reduced spurious image intensity.
  • Clearer defect images were obtained using broadband chirp wave excitation.
  • Specimens with low attenuation, which facilitate diffuse fields, resulted in superior image quality.

Conclusions:

  • The developed SLS defect imaging method enhances clarity by mitigating spurious signals.
  • Broadband chirp excitation and low-attenuation materials are optimal for diffuse field-based SLS defect imaging.
  • This approach offers a more reliable non-destructive evaluation of plate-like structures.