Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Reexamination Certificate
2011-04-12
2011-04-12
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
C073S29000R
Reexamination Certificate
active
07924216
ABSTRACT:
A method of determining a filling level of a product contained in a tank, the method comprising generating and transmitting electromagnetic signals; propagating the transmitted electromagnetic signals towards a surface of the product contained in the tank; receiving echo signals resulting from reflections at impedance transitions encountered by the transmitted electromagnetic signals, including a surface echo signal resulting from reflection at a surface of the product; determining a position of a reference impedance transition using a reference echo signal resulting from reflection of the transmitted electromagnetic signals at the reference impedance transition; determining an update level located above the surface, based on the determined position of the reference impedance transition and a known position of the reference impedance transition; determining a disturbance echo profile using at least one of the echo signals resulting from reflection of the transmitted signals at at least one impedance transition located above the update level; and determining the filling level based on the received echo signals and the disturbance echo profile.
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International Search Report for PCT/SE2009/050454, filed Apr. 28, 2009; 4 pages.
Galt Cassi
Rosemount Tank Radar AB
Tarcza Thomas H
Westman Champlin & Kelly P.A.
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