The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2000
Filed:
Sep. 17, 1998
Anthony A Ruffa, Hope Valley, RI (US);
Thomas R Stottlemyer, Mystic, CT (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A cavitation-resistant sonar array having reduced spacing between transdu elements is provided. The array has a series of transducer elements attached to an array fixture with spacing between elements being fixed at one-quarter wavelength or closer. Cavitation caused by this close spacing is eliminated 11 by replacing the water spaces between elements with a rho-c rubber which matches the acoustic impedance, z, of water, that is z=.rho.c. The rho-c material is bonded to element to prevent loss of contact between the element and the spacer. A processing computation correcting signal data is provided to account for any differences in the speed of sound, c, in the rho-c material when compared to the speed of sound in water.