Measuring and testing – Liquid level or depth gauge
Reexamination Certificate
2005-07-12
2005-07-12
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
C324S637000
Reexamination Certificate
active
06915689
ABSTRACT:
An apparatus for gauging the level of a liquid, above which a gas having a dielectric constant within a predetermined dielectric constant range exists, comprises a transmitter for transmitting a microwave signal in a propagation mode in a tube through the gas towards the liquid surface; a receiver for receiving the microwave signal reflected against the liquid surface and propagating back through the tube; and a processing device for calculating from the propagation time of the transmitted and reflected microwave signal the level of the liquid. In order to essentially avoid the influence on the calculated level by the dielectric constant of the gas above the liquid, the transmitter is adapted to transmit the microwave signal in a frequency band, at which the group velocity of the microwave signal in the propagation mode in the tube is, within the predetermined dielectric constant range, essentially independent of the dielectric constant.
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Fitzgerald John
Saab Rosemount Tank Radar AB
Westman Champlin & Kelly P.A.
Williams Hezron
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