Clough, A. R., Dutton, B. (Ben) and Edwards, R. S. (Rachel S.) (2011) Ultrasonic Rayleigh wave enhancements from angled defects in aluminium. In: Review of Progress in Quantitative Nondestructive Evaluation, San Diego, California, 18–23 July 2010. Published in: AIP Conference Proceedings, Vol.1335 (No.1). pp. 137-144. doi:10.1063/1.3591849 ISSN 0094-243X.

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Abstract

Non-linear enhancements of ultrasonic surface wave amplitude and frequency have been observed when an incident wave interacts with a surface defect. Previous measurements of surface wave interactions with defects have considered only those that are inclined normal to the surface. Here, the enhancement effects have been studied in aluminium samples with machined slots of fixed length and of varying angle to the horizontal; the degree of enhancement was studied as a function of defect angle using both a scanning laser source, and a scanning laser detector. An automated scanning system has been developed for use with the detector, an IOS two-wave mixer interferometer, capable of measuring the out-of-plane surface displacement on rough surfaces. B-scans, consisting of many A-scans stacked together, were used to identify wave modes present in the near field, the arrival times of which are dependent on the angle of the defect. The observed enhancement is caused by superposition of the incident Rayleigh wave with reflected and mode converted waves, thereby making it angle dependent.

Item Type:	Conference Item (Paper)
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Rayleigh waves, Finite element method, Interferometers, Semiconductor lasers, Aluminum, Metals -- Defects, Ultrasonic testing, Nondestructive testing
Journal or Publication Title:	AIP Conference Proceedings
Publisher:	American Institute of Physics
ISSN:	0094-243X
Official Date:	23 June 2011
Dates:	Date Event 23 June 2011 Published
Volume:	Vol.1335
Number:	No.1
Page Range:	pp. 137-144
DOI:	10.1063/1.3591849
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Research Council (ERC)
Grant number:	202735 (ERC)
Conference Paper Type:	Paper
Title of Event:	Review of Progress in Quantitative Nondestructive Evaluation
Type of Event:	Conference
Location of Event:	San Diego, California
Date(s) of Event:	18–23 July 2010

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