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Defect Imaging Enhancement through Optimized Shape Factors of the RAPID Algorithm Based on Guided Wave Beam Pattern

Yonghee Lee1, Younho Cho2

  • 1Graduate School of Mechanical System Design, Pusan National University, Busan 46241, Korea.

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Summary

A modified guided ultrasonic wave imaging algorithm improves defect detection accuracy in steel plates. This technique enhances defect visualization for critical structures like nuclear power plant containment liner plates.

Keywords:
beam pattern analysisguided waveimage modificationmode verificationsignal processingtomography

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Ultrasonic Wave Propagation

Background:

  • Guided ultrasonic waves are effective for structural health monitoring.
  • Imaging defects in thick steel plates presents challenges due to wave mode complexities.
  • Nuclear power plant containment liner plates require reliable inspection methods.

Purpose of the Study:

  • To enhance the imaging accuracy of defects in thick steel plates using guided ultrasonic waves.
  • To investigate and address limitations of Lamb wave modes in imaging.
  • To develop a modified imaging algorithm for improved defect characterization.

Main Methods:

  • Application of guided ultrasonic wave inspection technique.
  • Analysis of Lamb wave modes using short-time Fourier transform.
  • Tomography verification and imaging analysis.
  • Modification of a shape factor based on energy distribution and beam characteristics.

Main Results:

  • Successfully illustrated defect images in a 6 mm steel plate simulating containment liner plate (CLP).
  • Identified limitations of the antisymmetric Lamb wave mode in thick steel plates.
  • Observed beam skewing and distortion phenomena in specific S0 Lamb wave modes.
  • Demonstrated improved imaging accuracy with a modified shape function.

Conclusions:

  • The modified imaging algorithm significantly improves defect imaging accuracy.
  • The developed technique is suitable for field applications in critical infrastructure inspection.
  • Addressing Lamb wave mode limitations is crucial for reliable structural health monitoring.