Optical sensor for detecting moisture on a surface

Details Optical sensor for detecting moisture on a surface Optical sensor for detecting moisture on a surface

2006-03-28

2006-03-28

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S227250, C340S602000

Reexamination Certificate

active

07019322

ABSTRACT:
An optical sensor (5) for recording wetting of a surface (20) of a member (21), especially a window of a motor vehicle, having a transmitter (13), a receiver (14) and a retroreflector (11, 11′, 11″) for electromagnetic waves is proposed. The surface (20) of the member (21) has for this at least two sensing regions (12, 12′), which are exposed to electromagnetic waves originating from the transmitter (13) and coupled into the member (21) in a central region (10), the development of wetting on the sensing regions (12, 12′) effecting a change of the signal of the electromagnetic waves coupled out into the receiver (14) in the central region (10).For this, the retroreflector (11, 11′, 11″) is developed and positioned in such a way that it feeds back electromagnetic waves reflected by the surface (20) of the member (21) to the surface (20) of the member (21), and from there into the central region (10).

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