Miniature, high efficiency dual frequency ultrasonic transducer

Details Miniature, high efficiency dual frequency ultrasonic transducer Miniature, high efficiency dual frequency ultrasonic transducer

1995-05-23

1996-12-03

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, H01K 4108

Patent

active

055811442

ABSTRACT:
Ultrasonic transducer with a selectable beamwidth comprising a body of piezoelectric material in the form of an annulus having an outer diameter D and a thickness T. The body has proximal and distal generally planar parallel surfaces and a centrally disposed hole extending therethrough. The body has a cylindrical wall with a width W extending from the hole to the outer diameter. The transducer is capable of operating at low and high resonance frequencies with the low frequency resonance being determined by the diameter D and an aspect ratio of D/T and the high frequency resonance being determined by the thickness T and an aspect ratio of W/T.

REFERENCES:
patent: 1907425 (1933-05-01), Marrison
patent: 3136381 (1964-06-01), Anderson
patent: 3735159 (1973-05-01), Murry
patent: 4123681 (1978-10-01), Barlow
patent: 5059851 (1991-10-01), Corl et al.
Kunkel, "Finite-Element Analysis of Vibrational Modes in Piezoelectric Ceramic Disks," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 37 No. 4, Jul. 1990.
Brissaud, "Characterization of Piezoceramics," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 38, No. 6, Nov. 1991.

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