Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Reexamination Certificate
2006-03-24
2011-10-25
Gregory, Bernarr (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
C342S118000, C342S127000, C342S128000, C342S175000, C342S195000, C073S29000R, C324S600000, C324S629000, C324S637000, C324S642000
Reexamination Certificate
active
08044843
ABSTRACT:
Method and apparatus for determining the thickness of material layers of a container-held substance comprising a first material disposed in an upper layer and a second material disposed in a lower layer, by transmitting a radio signal through the substance towards a container portion; receiving reflected signals from a surface of the upper layer, a surface of the second layer, and the container portion; varying the frequency of the transmitted signal to determine phase displacement between transmitted and reflected signals; determining optical distances to the surfaces and the container portion, dependent on the phase displacements; determining the thickness of one of said layers dependent on phase displacement through and index of refraction of that layer; and determining the thickness of the other layer dependent on the thickness of said one of said layers.
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Agellis Group AB
Gregory Bernarr
Schwegman Lundberg & Woessner, P.A.
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