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Scanning laser techniques for characterisation of different surface breaking defect geometries
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Hernandez-Valle, Francisco, Edwards, R. S. (Rachel S.), Clough, A. R., Rosli, M. H. and Dutton, B. (Ben) (2012) Scanning laser techniques for characterisation of different surface breaking defect geometries. In: 18th World Conference on Non-Destructive Testing, Durban, South Africa, 16th-20th April 2012. Published in: Proceedings : 18th World Conference on Non-Destructive Testing
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Official URL: http://www.ndt.net/article/wcndt2012/general.htm
Abstract
Measurements using a laser scanning system consisting of a pulsed Nd:YAG laser to generate surface ultrasonic
waves and an interferometer to detect the surface displacement, are presented for different samples and defect geometries. We show, firstly, details of the interaction of Rayleigh waves in thick samples with machined slots inclined at an angle to the surface normal, or with simple branched geometries, scanning the generation source over the defect (SLLS) or scanning the detection point over the defect (SLD). Secondly, we discuss effects of Lamb waves interacting with V-shaped defects in thin samples. The results from these measurements have shown that the signal enhancement found in the near-field in both cases can be used to position the defect and gain an idea of its geometry, and have shown this to be a suitable fingerprint of the presence of the defect.
| Item Type: | Conference Item (Paper) | ||||
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| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Ultrasonic waves, Nondestructive testing, Surfaces (Technology) -- Defects, Ultrasonic testing | ||||
| Journal or Publication Title: | Proceedings : 18th World Conference on Non-Destructive Testing | ||||
| Publisher: | South African Institute for Non-Destructive Testing (SAINT) | ||||
| Official Date: | April 2012 | ||||
| Dates: |
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| Status: | Not Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Funder: | European Research Council (ERC) | ||||
| Grant number: | 202735 (ERC) | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 18th World Conference on Non-Destructive Testing | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Durban, South Africa | ||||
| Date(s) of Event: | 16th-20th April 2012 |
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