Multi-frequency capacitive measurement device and a method of operating the same
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United States of America Patent
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Apr 17, 2007
Grant Date -
Aug 31, 2006
app pub date -
Sep 16, 2005
filing date -
Sep 17, 2004
priority date (Note) -
Expired
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Abstract
A method and a system is provided that includes a multifrequency generator supplying signals of at least three different frequencies to an electrode assembly, the capacitance of which is detected for a plurality of different frequency points. In this way, the capacitance of the electrode assembly, which is influenced by a substance present in the vicinity of the electrode assembly, may be reliably identified. Preferably, the conditions of a road surface may be reliably monitored.
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