Extraction of texture in metal sheet using non-contact electromagnetic accoustic transducers (EMATS) and wavelet processing

Kwok Shun Ho, D.A. Hutchins, DR Billson, Minghui Li, Anthony Gachagan

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

2 Citations (Scopus)

Abstract

EMATs have been used to generate ultrasonic Lamb wave for the characterization of texture in metal sheets. Ultrasonic techniques have received considerable attention as an alternative technology for monitoring the texture of metal sheet, and many of these studies used EMATs for ultrasonic generation and detection. In this study, a different approach to the analysis has been used. In the previous work, only three constants define the elastic anisotropy in the most commonly used approximation. These were measured typically at 0°, 45°, and 90° with respect to the metal sheet. However, greater accuracy in calculating these Orientation Distribution Coefficients (ODCs) values can potentially be obtained by fitting the theoretical angular dependent velocity to the experimental data. It is then possible to extract the ODCs and obtain some degree of confidence in the values from the correlation of the fit. In this study, this approach has been implemented in the presence of multiple Lamb modes generated and detected by the magnetostrictive type EMATs using the Stationary wavelet transform (SWT) to extract the required data from selected Lamb wave modes
Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
EditorsDonald O. Thompson, Dale E. Chimenti
Place of PublicationMelville
Pages1373-1380
Number of pages8
Volume31
DOIs
Publication statusPublished - Jul 2011
Event38th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) - Burlington, United States
Duration: 17 Jul 201122 Jul 2011

Conference

Conference38th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE)
CountryUnited States
CityBurlington
Period17/07/1122/07/11

Keywords

  • extraction
  • texture
  • metal sheet
  • non-contact electromagnetic ccoustic transducers
  • wavelet processing
  • EMATS

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    Ho, K. S., Hutchins, D. A., Billson, DR., Li, M., & Gachagan, A. (2011). Extraction of texture in metal sheet using non-contact electromagnetic accoustic transducers (EMATS) and wavelet processing. In D. O. Thompson, & D. E. Chimenti (Eds.), Review of Progress in Quantitative Nondestructive Evaluation (Vol. 31, pp. 1373-1380). Melville. https://doi.org/10.1063/1.4716377