UNSPECIFIED (2001) The use of broadband acoustic transducers and pulse-compression techniques for air-coupled ultrasonic imaging. ULTRASONICS, 39 (3). pp. 181-194. ISSN 0041-624X

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Abstract

A pulse-compression technique has been applied to air-coupled testing of solid materials. Capacitance transducers were used to generate wide bandwidth swept-frequency (chirp) signals in air, which were then used to measure and image solid samples in through transmission. The results demonstrate that such signal processing techniques lead to an improvement in the signal to noise ratio and timing accuracy for air-coupled testing. Measurements of thickness and spectroscopic experiments are presented. Images of defects in a wide range of materials, including metals and carbon-fibre composites have also been obtained. This combination of capacitive transducers with pulse-compression techniques is shown to be a powerful tool for non-contact air-coupled ultrasonic measurements. (C) 2001 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) R Medicine
Journal or Publication Title:	ULTRASONICS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0041-624X
Date:	April 2001
Volume:	39
Number:	3
Number of Pages:	14
Page Range:	pp. 181-194
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/12213

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