Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-09-02
1987-10-13
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310326, 310337, 310324, 367155, H01L 4108
Patent
active
047001003
ABSTRACT:
Omnidirectional sonic transducers suitable for underwater operation as either hydrophones (listening devices) or projectors (sonic sources) are disclosed. The transducing device has a hollow resonant cavity with at least one flexural disk mounted therein in acoustic communication with both the interior and exterior of the cavity. The cavity also has at least one aperture providing acoustic coupling between the cavity interior and exterior, and a pliant lining covering substantially the entire cavity inner surface except for flexural disk surfaces and the aperture to detune the natural cavity resonance by reducing the rigidity of the cavity inner surface, thereby improving the overall frequency response characteristics of the transducing device.
REFERENCES:
patent: 3255431 (1966-06-01), Howatt
patent: 3660809 (1972-05-01), Pearson
patent: 3832762 (1974-09-01), Johnston et al.
patent: 4413198 (1983-11-01), Bost
patent: 4546459 (1985-10-01), Congdon
patent: 4604542 (1986-08-01), Thompson
Underwater Helmholtz-Resonator Transducers: General Design Principles, by A. S. Woollett, NUSC Technical Report 5633, 7-5-77.
Underwater Transducer Wetting Agents, by Ivey & Thompson, JASA vol. 78, No. 2, Aug. 1985, pp. 389-394.
Acoustics, by Beranek, McGraw-Hill Book Co., 1954, pp. 212-221.
Congdon John C.
Whitmore Thomas A.
Briody Thomas A.
Budd Mark O.
Magnavox Government and Industrial Electronics Company
Rickert Roger M.
Seeger Richard T.
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