Sensor arrangement for detecting the degree of wetting of a wind

Details Sensor arrangement for detecting the degree of wetting of a wind Sensor arrangement for detecting the degree of wetting of a wind

1997-01-15

1998-11-17

McGraw, Vincent P.

Optics: measuring and testing

Of light reflection

25022725, 318DIG2, G01N 2188, B60S 102

Patent

active

058384545

ABSTRACT:
A sensor device for detecting a wetting condition on a windshield where radiation emitted by a radiation transmitter is coupled with the windshield by a coupling element with a beam acceptance surface designed as focusing lens and where, following at least one total reflection from the windshield via a decoupling element which has a beam emission surface that is also a focusing lens. The radiation is decoupled to a radiation receiver and the axial transmitter radiation is totally reflected on a level first limiting surface, and the radiation acceptance surface has a spherical shape. The radiation transmitter is arranged such that the diverging transmitter radiation is essentially focused axis-parallel toward the first limiting surface and that the dimensions of the first limiting surface are at least big enough so that it detects the complete parallel-focused beam of rays.

REFERENCES:
patent: 4093384 (1978-06-01), Ferguson
patent: 4652745 (1987-03-01), Zanardelli
patent: 4676638 (1987-06-01), Yasuda
patent: 4701613 (1987-10-01), Watanabe et al.

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