UNSPECIFIED (2000) An air-coupled line-focused capacitive ultrasonic transducer. In: IEEE Ultrasonics Symposium, SAN JUAN, PR, OCT 22-25, 2000. Published in: 2000 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2 pp. 1061-1064. ISBN 0-7803-6365-5. ISSN 1051-0117.

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Abstract

A new type of air-coupled, line-focusing transducer is described. This capacitive broadband device, with an active area measuring 19.5mm x 45mm, consists of a metallised 3.5mm thick polymer film mounted over a brass backplate cylindrically concave along its length, with a radius of 28mm. Device bandwidth (-6dB) was found to be typically 200kHz to 900kHz, with a focal line width of similar to0.68 mm. A miniature air-coupled receiver was used to scan the radiated field of these devices, excited in both tone-burst and broadband mode, and the results compared to theoretical sound pressure plots using an impulse response method. A pair of devices has been used in a novel crossed arrangement to image the surface profile of solids.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology R Medicine
Series Name:	ULTRASONICS SYMPOSIUM
Journal or Publication Title:	2000 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2
Publisher:	IEEE
ISBN:	0-7803-6365-5
ISSN:	1051-0117
Editor:	Schneider, SC and Levy, M and McAvoy, BR
Official Date:	2000
Dates:	Date Event 2000 UNSPECIFIED
Number of Pages:	4
Page Range:	pp. 1061-1064
Publication Status:	Published
Title of Event:	IEEE Ultrasonics Symposium
Location of Event:	SAN JUAN, PR
Date(s) of Event:	OCT 22-25, 2000

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