Warped-wigner-hough transformation of lamb waves for automatic defect detection

Alessandro Perelli, Luca De Marchi, Emanuele Baravelli, Alessandro Marzani, Nicolò Speciale

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

To improve the defect detectability of Lamb wave inspection systems, application of non-linear signal processing was investigated. The approach is based on a Warped Frequency Transform (WFT) to compensate the dispersive behavior of ultrasonic guided waves, followed by a Wigner-Ville time-frequency analysis and the Hough Transform to further improve localization accuracy. As a result, an automatic detection procedure to locate defect-induced reflections was demonstrated and successfully tested by analyzing numerically simulated Lamb waves propagating in an aluminum plate. The proposed method is suitable for defect detection and can be easily implemented for real application to structural health monitoring.
Original languageEnglish
Title of host publication2011 IEEE International Ultrasonics Symposium
PublisherIEEE
Pages1084-1087
Number of pages4
ISBN (Electronic)978-1-4577-1252-4
ISBN (Print)978-1-4577-1253-1
DOIs
Publication statusPublished - 21 Oct 2011
Event2011 IEEE International Ultrasonics Symposium - Orlando, FL, USA
Duration: 18 Oct 201121 Oct 2011

Conference

Conference2011 IEEE International Ultrasonics Symposium
Period18/10/1121/10/11

Keywords

  • Dispersion
  • Transforms
  • Acoustics
  • Time frequency analysis
  • Aluminum
  • Educational institutions

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