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An air-coupled line-focused capacitive ultrasonic transducer
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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) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology R Medicine |
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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: |
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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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