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Focussing of ultrasonic waves in air using a micromachined Fresnel zone-plate
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UNSPECIFIED (1997) Focussing of ultrasonic waves in air using a micromachined Fresnel zone-plate. ULTRASONICS, 35 (4). pp. 275-285. ISSN 0041-624X.
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Abstract
An ultrasonic Fresnel zone-plate has been micromachined from a thin stainless steel disk for the purpose of focussing high-frequency ultrasonic waves in air. This zone-plate, which was designed with a focal length of 7.5 mm, consisted of five concentric stainless steel rings that were separated from one another by narrow air-channels. The zone plate was fitted to a micromachined air-coupled capacitance transducer source, and the radiation profile measured by a second 1 mm diameter air-coupled capacitance receiver. It is shown that the resultant spot size (for an operating frequency of 580 kHz) was 0.8 mm, with a 3 mm depth-of-held. Comparison to an existing theoretical model shows that the zone-plate is operating as might be expected, but that improvements might be obtained by further research. (C) 1997 Elsevier Science B.V.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) R Medicine |
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Journal or Publication Title: | ULTRASONICS | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0041-624X | ||||
Official Date: | June 1997 | ||||
Dates: |
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Volume: | 35 | ||||
Number: | 4 | ||||
Number of Pages: | 11 | ||||
Page Range: | pp. 275-285 | ||||
Publication Status: | Published |
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