Thinned array transducer for sonar

Details Thinned array transducer for sonar Thinned array transducer for sonar

1981-02-06

1983-04-19

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367155, 367165, 367173, 367103, 310337, H04R 140

Patent

active

043808085

ABSTRACT:
The thinned arrayed transducer for a sonar system includes an array of sonar elements mounted in rows (layers) and columns (staves) on a structure, preferably cylindrical, to form a checkerboard pattern wherein the spacing between adjacent elements in the rows and the columns is equal to or greater than .lambda..sub.m /2, where .lambda..sub.m is the wavelength of the signal of frequency f.sub.o transmitted in the medium where the sonar is being used. The transducer structure is made from a layered cloth impregnated with a phenol based material, and includes openings in which the sonar elments are mounted. The sonar elements which are effectively a half wavelength in length consist of a cylindrical ceramic section fixed end-to-end to a cylindrical metal section. The metal section is made of a loading metal, such as brass. The transmit-receive circuitry energizes the elements by row using a modulated signal to form a variable sonar beam. The signals detected by the elements are combined by column or stave to provide a column output signal and the signals from adjacent pairs of columns are combined to provide the output signals for the data processor.

REFERENCES:
patent: 2865016 (1958-12-01), Hudimac et al.
patent: 3068446 (1962-12-01), Ehrlich et al.
patent: 3480906 (1969-11-01), Thompson
patent: 3500304 (1970-03-01), Bozich
patent: 3505639 (1970-04-01), Chervenak et al.
patent: 4156863 (1979-05-01), Madison et al.
patent: 4222114 (1980-09-01), Rolleigh et al.
patent: 4307457 (1981-12-01), Wills

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