Method of sensing an amount of moisture on a surface of a substrate with temperature compensation
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United States of America Patent
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Apr 13, 2010
Grant Date -
May 1, 2008
app pub date -
Oct 30, 2006
filing date -
Oct 30, 2006
priority date (Note) -
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Abstract
A method for determining an amount of moisture on a surface of a substrate includes a step of transmitting a transmitter signal to generate a wave. The transmitter signal has a first phase. The wave is propagated to vibrate the surface. Vibrations in the surface are detected and converted into a receiver signal. The receiver signal has a second phase different than the first phase. The method includes the step of sensing the temperature of the substrate. The amount of moisture on the surface is computed based on a phase shift between the transmitter signal and the receiver signal that has been compensated to account for surface temperature.
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