Accession Number : ADD017501

Title :   Non-Invasive Acoustic Velocimetric Apparatus and Method.

Descriptive Note : Patent, Filed 14 Mar 94, patented 28 Mar 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Konrad, William L

Report Date : 28 Mar 1995

Pagination or Media Count : 4

Abstract : A first projector that generates a beam of acoustic energy having a first frequency, and a second acoustic projector that generates a beam of acoustic energy having a second frequency are provided. Interaction between the intersecting beams and particles present in the aquatic environment cause radiation of a third frequency at the region of beam intersection. The third frequency acoustic waves returned from the non-linear acoustic radiating area are monitored at a hydrophone, and the travel time of sound from the projectors to the hydrophone is determined. Successive readings can be made at various depths to obtain a velocity profile. Velocimetry can thus be accomplished free from any need to lower a tethered physical velocimeter into the depths.

Descriptors :   *ACOUSTIC EQUIPMENT, *VELOCIMETERS, *PATENTS, VELOCITY, ACOUSTIC WAVES, NONLINEAR SYSTEMS, PROFILES, SOUND, HYDROPHONES, OCEAN ENVIRONMENTS, TRAVEL TIME, SONAR PROJECTORS, TETHERING, DIFFERENCE FREQUENCY

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE