Process and apparatus for determining the condition of a road surface

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 havin...

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Bibliographische Detailangaben
Hauptverfasser:	GRIESINGER, MANFRED
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS METEOROLOGY PERFORMING OPERATIONS PHYSICS PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES SIGNALLING TESTING TRAFFIC CONTROL SYSTEMS TRANSPORTING VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	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.