Ultrasonic Phase Shift Moisture Sensing System With Temperature Compensation
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United States of America Patent
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Issued Date -
May 1, 2008
app pub date -
Oct 30, 2006
filing date -
Oct 30, 2006
priority date (Note) -
Abandoned
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Abstract
A sensing system computes an amount of moisture on a surface of a substrate, such as a window of a vehicle. The sensing system includes a transmitter which produces a wave to propagate through the substrate. A receiver receives the wave which propagated through the substrate. A phase shift detection circuit measures a phase shift between signals representing the transmitted and received wave. A temperature sensor senses a temperature of the substrate. A controller, in communication with the phase shift detection circuit and the temperature sensor, calculates the amount of moisture on the surface based on the phase shift and the temperature of the substrate. A wiper motor and wiper blade may then be actuated automatically based on the amount of moisture calculated to clear the moisture on the substrate.
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