Thinned array transducer for sonar

Details Thinned array transducer for sonar Thinned array transducer for sonar

G - Physics

01

S

349/25

G01S 7/52 (2006.01) B06B 1/06 (2006.01) G01S 7/521 (2006.01)

Patent

CA 1153458

TITLE THINNED ARRAY TRANSDUCER FOR SONAR INVENTORS Eugene E. Hill Marvin S. Scrimshaw Edward W. Showalter ABSTRACT OF THE DISCLOSURE 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.m/2, where .lambda.m is the wave- length of the signal of frequency fo 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 cylin- drical 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 modu- lated 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.

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