Electrio-acoustic transducers

Details Electrio-acoustic transducers Electrio-acoustic transducers

1984-06-13

1988-06-21

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367155, 367123, 310337, H01L 4108, H04R 1700, H04B 1300

Patent

active

047529180

ABSTRACT:
An electro-acoustic transducer according to the invention is of the Tonpilz type comprising a stack of piezo-electric plates placed between a horn and a countermass, and electrodes inserted between the plates. Some of the electrodes are connected to a common excitation or output conductor through phase-shifting circuits which allow the electric voltage of a proportion of these electrodes to be dephased. A logic unit allows the phase-shifting of the electrodes to be distributed within the stack according to several different groupings in dependence upon frequency. One application of the invention is to the construction of long-range power sonars.

REFERENCES:
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patent: 3769532 (1973-10-01), Cocquet et al.
patent: 3860901 (1975-01-01), Ehrlich et al.
patent: 3890591 (1975-06-01), Bocquillian et al.
patent: 4031418 (1977-06-01), Clugel et al.
patent: 4151437 (1979-04-01), Tocquet
patent: 4227110 (1980-10-01), Douglas et al.
patent: 4373143 (1983-02-01), Lindberg
patent: 4477783 (1984-10-01), Glenn
patent: 4509151 (1985-04-01), Anderson
patent: 4530138 (1985-07-01), Ritter

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