Moisture sensor with pre-demodulation gain and high-order filtering
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United States of America Patent
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Sep 26, 2000
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app pub date -
May 25, 1999
filing date -
May 25, 1999
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Abstract
A moisture sensor for detecting moisture on the surface of a transparent material. The moisture sensor includes one or more emitters for producing moisture sensing signals which are influenced by moisture on the transparent material, and one or more detectors for receiving the moisture sensing signals and producing a detector output signal. The moisture sensor further includes a pre-demodulation gain and filtering circuit having high order filtering for removing most of the unwanted ambient light noise and EMI interference from the detector output signal for the accurate detection of moisture in the presence of noise.
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