UNSPECIFIED (1995) THROUGH-THICKNESS CHARACTERIZATION OF SOLIDS BY WIDE-BAND AIR-COUPLED ULTRASOUND. ULTRASONICS, 33 (1). pp. 11-17. ISSN 0041-624X

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Abstract

A non-contact inspection system employing wideband air-coupled ultrasound has been used for the characterization of thin solid material. Generation and detection of pulsed ultrasound were accomplished on opposite sides of the sample (in the through-thickness mode) using micromachined air-coupled capacitance transducers. The resulting bandwidth allowed absolute velocities and thickness changes to be estimated with reasonable accuracy (greater-than-or-equal-to 1%) for polymers, wood products, glass, and carbon-fibre reinforced polymer composites. An appreciable increase in sensitivity is shown to result for toneburst operation when the frequency matches the sample's through-thickness resonance, and this was employed for the imaging of defects in composite materials.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) R Medicine
Journal or Publication Title:	ULTRASONICS
Publisher:	BUTTERWORTH-HEINEMANN LTD
ISSN:	0041-624X
Date:	January 1995
Volume:	33
Number:	1
Number of Pages:	7
Page Range:	pp. 11-17
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/20020

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