Thinned array transducer for sonar

Details Thinned array transducer for sonar Thinned array transducer for sonar

1982-08-27

1983-11-08

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367105, 367122, 367126, 367153, G01S 1502

Patent

active

044146540

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 elements 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: 2925581 (1960-02-01), Hackley et al.
patent: 3277432 (1966-10-01), Derouet
patent: 3824531 (1974-07-01), Walsh
patent: 3859622 (1975-01-01), Hutchison et al.
patent: 4001763 (1977-01-01), van Heynigen
patent: 4020446 (1977-04-01), Iida et al.

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