DocumentCode :
1042746
Title :
Theory of induced voltage electromagnetic flowmeasurement
Author :
Bevir, M.K.
Author_Institution :
University of Oxford, Oxford, England
Volume :
6
Issue :
2
fYear :
1970
fDate :
6/1/1970 12:00:00 AM
Firstpage :
315
Lastpage :
320
Abstract :
The contribution of each part of the flow to a meter signal is expressed in terms of a weight vector W and the velocity ν, with the signal \\propto \\int \\nu \\cdot W dr over the flowmeter volume. W depends on the magnetic field B and a vector defined entirely by the electrode and flowmeter geometry. A meter is called "ideal" if the signal is proportional to the flow rate and independent of the flow pattern. The condition on W for this is given and an experimental ideal meter mentioned. Since meters with small (point) electrodes cannot be ideal, weaker conditions on W for flows of different types are reviewed. A technique for designing short meters suitable for rectilinear flow with an unknown axisymmetric velocity profile is briefly described. The behavior of different shapes of electrodes, including electrodes of finite and variable conductivity, is discussed. Finally the problems of pulsating flow, magnetic field specification, and nonuniform and anisotropic blood conductivity are discussed.
Keywords :
Flow measurement; Anisotropic magnetoresistance; Blood; Conductivity; Electrodes; Electromagnetic devices; Geometry; Magnetic fields; Magnetic heads; Shape; Voltage;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1970.1066752
Filename :
1066752
Link To Document :
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