Accession Number : ADD014628

Title :   Barrier Sonar.

Descriptive Note : Patent, Filed 19 Jul 68, patented 3 Jul 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Murphree, Francis J

Report Date : 03 Jul 1990

Pagination or Media Count : 7

Abstract : An electronic barrier utilizes a bifurcated beam of wave energy to establish a barrier area having a null between the forks thereof. Objects encroaching on said beam cause a portion thereof to be scattered in the forward direction. Suitable receiver equipment located remote from the source of the bifurcated beam and responsive to the forward scattered beam is connected to provide an indication of said encroachment. Patents. (rrh)

Descriptors :   *PATENTS, *SONAR EQUIPMENT, SONAR PULSES, BARRIERS, ACOUSTIC BEAMS, FORWARD SCATTERING

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE