Tuned plate acoustic projector with piezoelectric driver

Details Tuned plate acoustic projector with piezoelectric driver Tuned plate acoustic projector with piezoelectric driver

1975-09-15

1976-09-28

Budd, Mark O.

Electrical generator or motor structure

Educational or construction units or kits

310 82, 310 91, 340 10, H01L 4108

Patent

active

039834255

ABSTRACT:
A tuned plate acoustic projector having a tuned plate that has its periph bonded to and supported by a housing. The outer face of the tuned plate is exposed to a fluid medium in which it is desired to generate acoustic waves. One end of a piezoelectric transducer is in contact with the central region of the inner face of the tuned plate and the other end is in contact with a mass slug that has a relatively large inertia base for the transducer. A compressive bias force is applied to the transducer to maintain the transducer in compression and to thereby prevent the generation of excessive tensile stresses in the transducer during operation. The thickness of the tuned plate is selected or tuned so that the propagation velocity of the flexural waves in the tuned plate matches the acoustic propagation velocity of the external fluid medium. An approximately hemispherical acoustic beam is obtained in the fluid medium which is the composite of a search light beam which is generated by the piston action of the transducer against the central region of the tuned plate and a toroidal rim fire beam which is generated by the transfer of energy from the radiating flexural waves in the tuned plate into acoustic waves in the fluid medium.

REFERENCES:
patent: 1589962 (1926-06-01), Hecht et al.
patent: 1590369 (1926-06-01), Hahnemann et al.
patent: 2541944 (1951-02-01), Slaymaker et al.
patent: 2967957 (1961-01-01), Massa
patent: 3737690 (1973-06-01), Antonio
patent: 3846779 (1974-11-01), Martner
patent: 3868954 (1975-03-01), Veda

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