DocumentCode
768583
Title
A Phase-Shift Ultrasonic Flowmeter
Author
Zarnstorff, W.C. ; Castillo, C.A. ; Crumpton, C.W.
Author_Institution
The Cardiovascular Research Laboratory, Department of Medicine, University of Wisconsin Medical School, Madison, Wis.
Volume
9
Issue
3
fYear
1962
fDate
7/1/1962 12:00:00 AM
Firstpage
199
Lastpage
203
Abstract
An ultrasonic flowmeter using phase-shift techniques has been developed to measure phasic blood flow in animals. Lead zirconate titanate transducers are located diagonally opposed over the vessel so that 1-Mc ultrasound may be transmitted alternately upstream and downstream. The upstream and downstream transit times are measured by heterodyning the 1-Mc receiver crystal output to 10 kc, and then feeding this signal to an audio phasemeter. The phasemeter output is an ac signal whose magnitude represents flow velocity, and phase (relative to the chopper drive) indicates flow direction. The phasemeter output is amplified and synchronously detected to drive a recorder
Keywords
Animals; Blood flow; Choppers; Fluid flow measurement; Phase detection; Phase measurement; Titanium compounds; Ultrasonic imaging; Ultrasonic transducers; Ultrasonic variables measurement;
fLanguage
English
Journal_Title
Bio-Medical Electronics, IRE Transactions on
Publisher
ieee
ISSN
0096-1884
Type
jour
DOI
10.1109/TBMEL.1962.4322999
Filename
4322999
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