Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1989-09-15
1991-05-21
Wieder, Kenneth
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324686, G01R 2726
Patent
active
050178792
ABSTRACT:
An apparatus for use in the capacitive measurement of the void fraction in a flowing liquid. An assembly of at least two electrodes is spaced apart around the exterior of the body defining a flow passage such that the capacitance of the electrode assembly is a function of the dielectric constant of material within the passageway. The radial thickness of the body is substantial such that the passageway occupies a portion of the electrostatic field of the electrode assembly which is relatively uniform. The dielectric constant of the body may be substantially equal to the expected dielectric constant of the said liquid. The body may be tubular with the electrode assembly directly supported on the radially outer surface of the tube.
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patent: 4288741 (1981-09-01), Dechene et al.
patent: 4713603 (1987-12-01), Thorn
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J. Phys. E: Scientific Instruments, vol. 11, 12/1978, Printed in Great Britain, "A Low-Cost Solids Flowmeter for Industrial Use", pp. 1005-1009.
"A Frequency-Modulated Capacitance Transducer for On-Line Measurement of Two-Component Fluid Flow", by R. G. Green and J. M. Cunliffe, 8252 Measurement 1 (1983), Oct.-Dec., No. 4, London, Gr. Britain.
Abstract-"Method and Apparatus for Measuring Average Void Ratio of Flowline of Gas-Liquid Two-Phase Stream", by Nobuo Yamamoto, vol. 10, No. 72 (P-438) (2129), Mar. 22, 1986.
Beck Maurice
Hunt Andrew
Lucas Gary
DuPont Henri
Hyden Martin
Regan Maura K.
Ryberg John J.
Schlumberger Technology Corporation
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