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
      Direction Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE