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Considerations for measuring acoustic birefringence in thin sheets using electromagnetic acoustic transducers

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Fletcher, M. P. and Dixon, S. (2007) Considerations for measuring acoustic birefringence in thin sheets using electromagnetic acoustic transducers. In: 33rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Portland, Oregon, 30 Jul - 04 Aug 2006. Published in: Review of Progress in Quantitative Nondestructive Evaluation, Volume 894 pp. 1245-1249. ISBN 9780735403994. doi:10.1063/1.2718108 ISSN 0094-243X.

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Official URL: http://dx.doi.org/10.1063/1.2718108

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Abstract

In aluminium or steel sheets it is generally accepted that the energy of through thickness shear waves is steered into two orthogonal polarisations, parallel and perpendicular to the rolling direction of the sheet. Ultrasonic velocity measurements used to determine the orientation distribution coefficients (ODCs) in thin sheets can be obtained from the last Fourier Transform of the time domain signal. In the case of thin birefringent samples, data from radially polarised shear waves can be analysed in the frequency domain allowing peaks to be resolved that correspond to the slightly different velocities associated with each shear wave polarisation. By rotating a linearly polarised electromagnetic acoustic transducer through 360 degrees in small increments it is observed that the calculated velocities are not constant and are dependent on the signal processing used with the fast Fourier Transform. Further investigation using simulated waveforms show that this inconsistency in calculated velocity was not due to any physical effect of the ultrasound in the test sample but rather an artefact of the data analysis itself.

Item Type: Conference Item (Paper)
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Series Name: AIP CONFERENCE PROCEEDINGS
Journal or Publication Title: Review of Progress in Quantitative Nondestructive Evaluation
Publisher: AIP Publishing
ISBN: 9780735403994
ISSN: 0094-243X
Editor: Thompson, DO and Chimenti, DE
Official Date: 21 March 2007
Dates:
DateEvent
21 March 2007Published
Volume: Volume 894
Number of Pages: 5
Page Range: pp. 1245-1249
DOI: 10.1063/1.2718108
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Conference Paper Type: Paper
Title of Event: 33rd Annual Review of Progress in Quantitative Nondestructive Evaluation
Type of Event: Conference
Location of Event: Portland, Oregon
Date(s) of Event: 30 Jul - 04 Aug 2006

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