Method for analysing a substance in a container
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United States of America Patent
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Jun 8, 2010
Grant Date -
May 21, 2009
app pub date -
Mar 24, 2006
filing date -
Mar 31, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for analyzing a substance in a container, the method comprising the steps of: disposing antenna means (3) at a predetermined geometrical distance (L) from a container portion (13); transmitting a signal from said antenna means through a surface portion (12) of the substance towards said container portion; receiving a first reflected signal in said antenna means from said container portion; determining a geometrical distance (L1) from the surface portion to the container portion; varying the frequency of the transmitted signal to determine a first phase displacement between the transmitted signal and the first reflected signal; determining an optical distance from the surface portion to the container portion based on the first phase displacement; and determining the index of refraction (nt) of said substance based on the optical and geometrical from the surface portion to the container portion.
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