Spherically focused capacitive-film, air-coupled ultrasonic transducer
Spherically focused capacitive-film, air-coupled ultrasonic transducer
Date
2006-01-24
Authors
Song, Junho
Holland, Stephen
Chimenti, Dale
Holland, Stephen
Holland, Stephen
Chimenti, Dale
Holland, Stephen
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Altmetrics
Authors
Holland, Stephen
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Research Projects
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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.
Comments
This article was originally published in Journal of the Acoustical Society of America 119, no. 2 (2006): EL1–EL6, doi:10.1121/1.2152293.