SENSOR FOR DETECTING DIRT AND/OR RAIN AND METHOD FOR OPERATING A SENSOR
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United States of America Patent
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app pub date -
Dec 18, 2009
filing date -
Sep 13, 2006
priority date (Note) -
Abandoned
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Abstract
A sensor detects dirt and/or rain having a transmitter unit (12, 112) and at least one receiver unit (16, 116) as well as a test surface (22, 122), an accumulation (30, 32) on the test surface (22, 122) being detectable by a light beam (24, 26; 124, 126), which is emitted by the transmitter unit (12, 112) and absorbed by the receiver unit (16, 116). The transmitter unit (12, 112) has at least two transmitters (114), at least one of which comprises two or more locally closely adjacent transmission sources (114a, 114b, 114c, 114d), one receiver (18, 118) of the receiver unit (16, 116) being associated with each transmitter (114). The receiver (18, 118) have one or more individual receivers, at least one of the transmitters (114) being implemented for the purpose of emitting at least two different wavelengths, which are detectable by the associated receiver (18, 118).
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