Non-invasive acoustic velocimetric apparatus and method

Details Non-invasive acoustic velocimetric apparatus and method Non-invasive acoustic velocimetric apparatus and method

1994-03-14

1995-03-28

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

G01S 1558

Patent

active

054023939

ABSTRACT:
A first projector that generates a beam of acoustic energy having a first equency, 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.

REFERENCES:
patent: 3388372 (1968-06-01), Witz

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