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US 4,288,741 AGranted
Electrical measurement of fluid void fraction for fluid having capacitive and resistive conductive components
AssigneeAuburn International, Inc.
InventorsRonald L. Dechene, Robert E. Newton
Life of this patent
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Abstract
Liquid with solid or gas phases mixed therein is measured as to liquid and non-liquid volume percent by application of an oscillating voltage to the liquid and separation of resultant conductive and capacitive currents to achieve valid and effective measurement of the latter, unmasked by the larger conductive currents obtainable in the mixed phase medium analyzed.
Claims4
Method of measuring a liquid content of mixed phase fluid in a container wherein a conductive liquid contains voids therein comprising,
- making a capacitive current measurement between two spaced (in cross-section of the fluid container) electrodes,
- and cancelling out a conductive (electrically) component of the current measurement through the fluid inherently picked up in making the capacitive measurement so that the capacitive measurement is not masked by the conductive measurement and wherein
- the measured current is produced by application of an oscillating voltage to the electrodes and the output capacitive current component (or a voltage derivative thereof) is shifted into phase with the oscillating voltage.
Dependencies are inferred from the claim text.