Most are an Infared ( IR ) transmitting LED and a IR receiver.
When there is not rain on the glass the IR travels through the glass but when the glass is wet the IR is reflected and the receiver detects the IR signal and turn the wipers on. Even rain droplets form enough mirroring surface to trigger the detector.
Regards
Peter
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Do you mean they work by refraction? Thats how I thought they worked anyway.
Mark.
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.... or more to point, why?
Terry
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.... or more to point, why? Terry
If drivers can't see pedestrians, cyclists, other vehicles, lamp posts, trees and walls, how do you expect them no notice raindrops!
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Well I don't know about that. There are a lot of people who drive around with fog lights on when there isn't any fog....
Andy
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Now there's a good idea - fog sensing fog lamps. Excellent.
Andy
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Well I don't know about that. There are a lot of people who drive around with fog lights on when there isn't any fog....
Who also drive around with little lights on their washers jets so that they can find them at night!!
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I've got 'em (rain sensing wipers) on my Leon and they work very well. Adjust speed depending upon the rain intensity....a gadget worth having in my opinion.
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Mine do the same thing and all I have to do is turn a little knob. I bet my little knob goes wrong less often than your auto sensor.
:o)
Terry
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