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Advances in wide bandwidth air-coupled capacitance transducers

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4 Author(s)
Hutchins, D.A. ; Dept. of Eng., Warwick Univ., Coventry, UK ; Bashford, A.G. ; Wright, W.M.D. ; Schindel, D.W.

Investigations into the field characteristics of an air-coupled ultrasonic capacitance transducer have been performed for a range of transducer configurations. The pressure field of a wide bandwidth silicon backplate capacitance transducer has been scanned in air, and compared to theory based on a plane piston approach. New devices have been fabricated, using laser-machined backplates and an electret film, and are described. The devices have also been used in an air-coupled tomographic imaging experiment

Published in:

Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE  (Volume:2 )

Date of Conference:

7-10 Nov 1995

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