Spherically focused capacitive-film, air-coupled ultrasonic transducer

Date
2006-01-24
Authors
Song, Junho
Holland, Stephen
Chimenti, Dale
Holland, Stephen
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Altmetrics
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Aerospace Engineering
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Aerospace Engineering
Abstract

A spherically focused no mirrors capacitive-film, air-coupled ultrasonic transducer, constructed using a spherically deformed backplate and metalized polymer film, has been designed, fabricated, and its performance characterized. A 1 cm diameter device has a center frequency of 805 kHz and a 6 dB bandwidth of 760 kHz. Comparisons of field strength in the focal zone with theoretical calculations for a spherically focused piston show that the device achieves diffraction-limited focusing. The nominal focal point of 25 mm lies within 0.01 mm of the calculated value for this device.

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This article was originally published in Journal of the Acoustical Society of America 119, no. 2 (2006): EL1–EL6, doi:10.1121/1.2152293.

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