Optoelectronic sensor device for the detection of the degree of

Details Optoelectronic sensor device for the detection of the degree of Optoelectronic sensor device for the detection of the degree of

1995-07-30

1998-10-06

McGraw, Vincent P.

Optics: measuring and testing

Of light reflection

25022725, 2503418, 318DIG2, G01N 2188, B60S 102

Patent

active

058186000

ABSTRACT:
An optoelectronic sensor device for the detection of the degree of wetting of a transparent vehicle screen with precipitation, includes a beam guide with two opposing parallel surfaces and two surfaces which lie opposite to one another and which are angled in opposing fashion through which beams enter and exit, one of the parallel surfaces being coupled to the vehicle screen in an optical fashion, the beam entry surface cooperating with an optical transmitter and the exit surface cooperating with an optical receiver. The device limits the wavelength of rays which exit from the beam guide to the operating range of the beam transmitter. Two filters (4) are incorporated in the beam path whose pass ranges overlap within a narrow frequency band.

REFERENCES:
patent: 4701613 (1987-10-01), Watanabe et al.
patent: 4867561 (1989-09-01), Fujii et al.

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