Method and apparatus for determining the local velocities in a m

Details Method and apparatus for determining the local velocities in a m Method and apparatus for determining the local velocities in a m

1988-04-28

1989-04-25

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

7386125, 12866108, G01F 166

Patent

active

048254223

ABSTRACT:
A measure window (29-30, FIG. 2d) is provided in a Doppler velocity profile (FIG. 2c) by deleting an initial section (T.sub.1) and a terminal section (T.sub.2) of each emission cycle of a train of ultrasound of a period T so as to conserve only the section (T.sub.o) which it is desirable to study. The conserved section (T.sub.o) is thereafter segmented into a certain number (N) of measure channels. The advantage of restricting the zone divided into channels to the part which is really useful is that the definition of the profile which is obtained is improved, even when the emitter-receptor of ultrasound is located at a relatively important distance in comparison with the depth of the zone which is studied.

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Harada, "Fluid Control and Measurement", Society of Instrument and Control Engineers, Japan, Sep. 1985.
Takeda, "Velocity Profile Measurement by Ultrasound Doppler Shift method", Int J. Heat and Fluid flow, 1986.

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