Method and apparatus for detecting ice and packed snow

Details Method and apparatus for detecting ice and packed snow Method and apparatus for detecting ice and packed snow

1996-08-21

1998-10-06

Mullen, Jr., Thomas J.

Communications: electrical

Condition responsive indicating system

Specific condition

25033911, G08B 1902

Patent

active

058183396

ABSTRACT:
An apparatus for detecting the presence of ice or smooth packed snow on a road surface has a source of electromagnetic radiation, for example, a light emitting diode. This is mounted to illuminate an area of the road surface. It is driven by a modulating circuit at a known frequency. A detector is mounted adjacent the light source to receive radiation reflected back from the road surface, to generate a detector signal. This signal is demodulated by a demodulator to generate an intermediate signal. This is preferably compared with a fixed value, to determine whether the reflectivity of the road surface exceeds a set value, indicative of the presence of ice.

REFERENCES:
patent: 3634753 (1972-01-01), Unterberger
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patent: 4690553 (1987-09-01), Fukamizu et al.
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patent: 5301905 (1994-04-01), Blaha
patent: 5313189 (1994-05-01), Dodd et al.
patent: 5313202 (1994-05-01), Hansman, Jr. et al.

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