Accession Number : ADD003657
Title : Acoustic Foghorn for Directional Signaling.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Widener,Maurice Ward
Report Date : 08 Feb 1977
Pagination or Media Count : 6
Abstract : A method of creating a highly directional acoustic beam that can be swept over the water near the entrance of a harbor or channel location is described. The information provided to a boat operator as a result of the acoustic beam includes the operator's absolute bearing from the acoustic source. The nonlinear acoustic beam has a narrow beamwidth and is produced by small transducers that can be rotated in a selected scanning motion to provide a sequence of acoustic signals easily recognizable by the unaided human ear of the boat operator who is cognizant of the acoustic sequence.
Descriptors : *Patents, *Acoustic beams, *Fog signals, *Bearing(Direction), Navigational aids, Acoustic horns, Nonlinear systems, Directional, Transducers, Harbors, Channels(Waterways)
Subject Categories : Acoustic Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE