Rain sensor using low harmonic content signals
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United States of America Patent
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Oct 21, 2003
Grant Date -
N/A
app pub date -
Dec 17, 2001
filing date -
Jun 18, 1999
priority date (Note) -
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Abstract
A rain sensor to detect humidity drops inside an area on a transparent window has at least one transmitting element to emit optical rays into the window and has at least one receiving element to receive at least one part of the emitted optical rays where the intensity of the optical rays received is dependent on the number of humidity drops in the area of the window observed by the rain sensor. So that interference from the rain sensor with radio broadcasts is effectively reduced and, if possible even completely prevented, the rain sensor has a generator to generate an electrical signal which has a lower harmonic content than square-wave signals, preferably a sine-wave electrical signal to power each transmitting element of the rain sensor.
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