Road surface condition detection system

Details Road surface condition detection system Road surface condition detection system

1980-06-12

1987-09-01

Pinter, William H.

Optics: measuring and testing

Infrared and ultraviolet

340583, 356448, G01N 2147, G01N 2155, G08B 1902

Patent

active

046905537

ABSTRACT:
Road surface condition detection system comprising light projector means for projecting light including the infrared region of the spectrum to a road surface to sense the condition thereof, the infrared having wavelengths at which the reflectance of snow is smaller than that of the road surface in a dry condition, light receiving means for receiving light reflected from the road surface, comparisons means for comparing the output signals generated from the light receiving means with reference signal levels corresponding to dry, wet, snowy and frozen conditions, and judging means for judging the road surface to be one of the conditions in accordance with results of comparison.

REFERENCES:
patent: 2816233 (1957-12-01), Krueger
patent: 3471698 (1969-10-01), Mausteller et al.
patent: 4171918 (1979-10-01), MacTaggart
De La Perrelle et al. "The Measurements of Absorptivity & Reflectivity", Infrared Physics, 1963, pp. 35-43.

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