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

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Ho, K. S., Hutchins, David A., Billson, Duncan R., Li, M. H. and Gachagan, A. (2012) Extraction of texture in metal sheet using non-contact electromagnetic acoustic transducers (EMATS) and wavelet processing. In: 38th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE, Burlington, VT; United States, 17-22 Jul 2011. Published in: AIP Conference Proceedings, Volume 1430 (Number 31). pp. 1373-1380. ISSN 0094-243X. doi:10.1063/1.4716377

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Official URL: http://dx.doi.org/10.1063/1.4716377

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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. © 2012 American Institute of Physics.

Item Type: Conference Item (Paper)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: AIP Conference Proceedings
Publisher: American Institute of Physics
ISSN: 0094-243X
Official Date: 2012
Dates:
DateEvent
2012Published
Volume: Volume 1430
Number: Number 31
Page Range: pp. 1373-1380
DOI: 10.1063/1.4716377
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Conference Paper Type: Paper
Title of Event: 38th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE
Type of Event: Other
Location of Event: Burlington, VT; United States
Date(s) of Event: 17-22 Jul 2011

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