Optics: measuring and testing – Of light reflection – By comparison
Patent
1998-08-20
2000-03-21
Font, Frank G.
Optics: measuring and testing
Of light reflection
By comparison
3562372, 356388, 356390, 340905, G01N 2125, G01N 2100, G01B 1100, G08G 109
Patent
active
060409169
ABSTRACT:
In a process for determining the condition of a road surface, light is beamed onto the road surface and backscattered light is detected and spectrally analyzed. The light beam contains two light fractions, one having wavelength range which is not significantly absorbed by water/ice and another having a wavelength range which is significantly absorbed by these materials. The first light fraction contains light of several different wavelengths and the spectral analysis includes the determination of an approximation reference curve for the spectral plots of the backscattered light when the road is dry. This is accomplished by using the spectral data of the backscattered light fraction in the wavelength range without significant absorption, and the determination of the difference between the spectral data of the backscattered-light fraction in the other wavelength range and the corresponding data of the approximation reference curve for at least one wavelength. A typical use, for example, is for continuous qualitative and quantitative determination of the condition of the road surface on which a road vehicle is driving.
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patent: 5808734 (1998-09-01), Kolari
Daimler-Chrysler AG
Font Frank G.
Punnoose Roy M.
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