Sensor device for determining the degree of wetting and/or soili

Details Sensor device for determining the degree of wetting and/or soili Sensor device for determining the degree of wetting and/or soili

1998-04-02

2000-04-18

Font, Frank G.

Optics: measuring and testing

Of light reflection

25022725, G02B 642, G01N 2155

Patent

active

060521961

ABSTRACT:
A sensor device for determining the degree of wetting and/or soiling of a pane in a motor vehicle is provided. The sensor device detects the coating of moisture on the outer side of the pane via an optical beam which is arranged in the area of the pane. The sensor device includes a reflector positioned in the pane, the reflector directing the beam through the pane under conditions of total reflection or reflection at the outer side of the pane and at the reflector. The pane additionally includes a light filter which absorbs a selected wavelength of sunlight. The attenuation is reduced via an optically more absorbent layer of the light filter.

REFERENCES:
patent: 4589771 (1986-05-01), Watanabe et al.
patent: 4652745 (1987-03-01), Zanardelli
patent: 4701613 (1987-10-01), Watanabe et al.
patent: 4798956 (1989-01-01), Hochstein
patent: 5414257 (1995-05-01), Stanton
patent: 5498866 (1996-03-01), Bendicks et al.
patent: 5917603 (1999-06-01), Tanaka et al.

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