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Ultrasonic Rayleigh wave enhancements from angled defects in aluminium

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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.

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Official URL: http://dx.doi.org/10.1063/1.3591849

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 > Physics

Library of Congress Subject Headings (LCSH):

Rayleigh waves, Finite element method, Interferometers, Semiconductor lasers, Aluminium, 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

Identification Number:

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

References:

1. I.A. Viktorov. “Rayleigh and Lamb waves: physical theory and applications.” Plenum Press 1967.
2. B. Vu, V. Kinra. “Diffraction of Rayleigh waves in a half space. I. Normal edge crack.” J. Acoust. Soc. Am. 77 (4) April 1985.
3. S. Dixon, B. Cann, D.L. Carroll, Y. Fan and R.S. Edwards. “Non-linear enhancement of laser generation ultrasonic Rayleigh waves by cracks.” Nondestructive Testing and Evaluation. Vol. 23, No. 1, March 2008, 25 – 34.
4. X. Jian, S. Dixon, N. Guo and R.S. Edwards. “Rayleigh wave interaction with surface breaking cracks.” J. Appl. Phys. 101, pp. 064906 (2007).
5. B. Dutton, A.R. Clough, M.H. Rosli and R.S. Edwards. “Non-contact ultrasonic detection of angled surface defects.” Under review.
6. A.K. Kromine, P.A. Fomitchov, S. Krishnaswamy, J.D. Achenbach. “Laser ultrasonic detection of surface breaking discontinuities: scanning laser source technique.” Materials Evaluation. February 2000, 173 – 177.
7. B. Dutton, R.S. Edwards, M.H. Rosli. “Defect feature extraction using surface wave interactions and time-frequency behaviour.” Review of progress in quantitative non-destructive evaluation. Feb. 22nd 2010. Vol 1211, pp. 647 – 654.
8. C.B. Scruby, L.E. Drain. “Laser ultrasonics: techniques and applications.” Adam Hilger, 1990.
9. M. Klien, G. Bacher, A. Grunnet-Jepson, D. Wright, W. Moerner. “Homodyne detection of ultrasonic surface displacements using two-wave mixing in photorefractive polymers.” Optics communications, 162 (1999) 79 – 84.
10. R.S. Edwards, X. Jian, S. Dixon. “Signal enhancement of the in-plane and out-of-plane Rayleigh wave components.” Applied Physics Letters 87, 194104 (2005)

URI:

http://wrap.warwick.ac.uk/id/eprint/40125

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