Browse Prior Art Database

Underwater Detection

IP.com Disclosure Number: IPCOM000097990D
Original Publication Date: 1961-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Knox, LA: AUTHOR

Abstract

The system detects underwater acoustic signals and comprises a Luneberg lens 10 and an array of hydrophones 11.

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Underwater Detection

The system detects underwater acoustic signals and comprises a Luneberg lens 10 and an array of hydrophones 11.

The Luneberg lens 10 is formed by a plurality of vertically stacked horizontal sections 12 to provide a spherical structure. Each of the horizontal sections 12 has concentrically oriented cells 13 formed by dividers 14 of thin plastic material. The cells 13 are filled with liquids of varying refractive properties. The hydrophones 11 are positioned about the surface of the Luneberg lens and form the acoustical equivalent of the retina of the human eye. The underwater detection system is supported in sea water by its buoyancy and a net 15 connected to support 16.

Each acoustic signal, within a predetermined area of elevation and azimuth, is simultaneously focused into a spot on the array of hydrophones. The outputs of the hydrophones represent simultaneous beams formed entirely by the Luneberg lens.

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