Palmer, S. B., Burrows, S. E. (Susan E.) and Dixon, S. (2011) Detection of surface breaking cracks using thermographic and non-contact ultrasonic methods. In: Conference on Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security, San Diego, CA , 07-10 Mar 2011. Published in: Proceedings of SPIE, Vol.7983 79831V-79831V.

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Abstract

A combined ultrasound and thermography defect detection system using a raster scanned Q-switched laser as a source of heat and ultrasound has been developed for identifying surface breaking defects. Heat is generated on a sample surface by a laser source and the resultant thermal image is examined by a thermal imaging camera. This can be done using a cw or a pulsed laser, but for ultrasonic generation a pulsed laser beam is required. When a defect is present, the flow of heat in the sample is disturbed and a change in shape of the thermal spot on the sample's surface can be detected. The pulsed laser beam generates simultaneously an ultrasonic wave that can be detected by a suitable transducer, which in this case is an electromagnetic acoustic transducer (EMAT). The presence of a defect changes both the amplitude and frequency content of the received wave. Three dimensional finite element modelling of the interaction between Lamb waves and defects have been studied and compared with experimental data, in order to optimise source and detector positions around a defect. The approach can detect surface crack defects via the ultrasonic and thermography method in one measurement.

Item Type:	Conference Item (Paper)
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Engineering Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Thermography, Ultrasonic testing, Electroacoustic transducers, Surfaces (Technology) -- Defects, Surfaces (Technology) -- Testing
Journal or Publication Title:	Proceedings of SPIE
Publisher:	S P I E - International Society for Optical Engineering
ISSN:	0277-786X
Date:	2011
Volume:	Vol.7983
Page Range:	79831V-79831V
Identification Number:	10.1117/12.881198
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Conference Paper Type:	Paper
Title of Event:	Conference on Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security
Type of Event:	Conference
Location of Event:	San Diego, CA
Date(s) of Event:	07-10 Mar 2011
URI:	http://wrap.warwick.ac.uk/id/eprint/38480

Data sourced from Thomson Reuters' Web of Knowledge

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