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Directional Velocity Estimation Using Focusing Along the Flow Direction II: Experimental Investigation.

Directional Velocity Estimation Using Focusing Along the Flow Direction II: Experimental Investigation.

Authors :
Jensen, Jørgen Arendt
Bjerngaard, Rasmus
Source :
IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control; Jul2003, Vol. 50 Issue 7, p873, 8p, 4 Black and White Photographs, 1 Diagram, 20 Graphs
Publication Year :
2003

Abstract

A new method for directional velocity estimation is investigated through a number of flow rig measurements. The method uses beam-formation along the flow direction to generate data, where the correct velocity magnitude can directly be estimated from the shift in position of the received consecutive signals. The shift is found by cross-correlating the beam-formed lines. The approach can find the velocity in any direction, including transverse to the traditionally emitted ultrasound beam. The method is investigated using a flow rig with a peak velocity of 0.15 m/s. A 7-MHz linear array transducer is used together with a dedicated sampling system to acquire signals from 64 transducer elements simultaneously. A technique for obtaining 128-element data using multiplexing is also presented. The data is beamformed off-line on a PC. A relative standard deviation of 1.4% can be obtained for a beam-to-flow angle of 45° and 4.3% at 90°. Color flow images are displayed showing that the correct velocity magnitude can be obtained with the method for beam-to-flow angles of 60 and 90° with an accuracy of 3 to 4%. [ABSTRACT FROM AUTHOR]

Subjects

Subjects :
SPEED
FLUID dynamics

Details

Language :
English
ISSN :
08853010
Volume :
50
Issue :
7
Database :
Complementary Index
Journal :
IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control
Publication Type :
Academic Journal
Accession number :
10488192
Full Text :
https://doi.org/10.1109/TUFFC.2003.1214506