Optics: measuring and testing – By shade or color – With color transmitting filter
Patent
1998-08-20
2000-04-11
Evans, F. L.
Optics: measuring and testing
By shade or color
With color transmitting filter
356328, 25033911, 340583, G01N 2127, G01N 2147
Patent
active
060493879
ABSTRACT:
In a process and apparatus for determining the condition of a road surface, light backscattered from a road surface is divided into spectral components and the spectral intensity distribution of the backscattered light is analyzed. The wavelength-dependent backscattered light spectrum of a dry road surface is arranged with a mathematical function with free parameters. This function is multiplied by an exponential absorption term which describes the light transmission of a water layer of a defined thickness in order to obtain a mathematical function for the wavelength-dependent distribution of the backscatter intensity (as it impinges on the receiver). Using the actual measured values, the free parameters of the function can then be calculated to obtain a best possible approximation. This among other things, results in a determination of the thickness of the water layer. In order to implement the process, the system is a spectrometer which uses an absorbing element applied directly to a CCD sensor line in place of a dispersive element.
REFERENCES:
patent: 4687329 (1987-08-01), Schultz
patent: 5166755 (1992-11-01), Gat
Daimler-Chrysler AG
Evans F. L.
LandOfFree
Process for determining the condition of a road surface and syst does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for determining the condition of a road surface and syst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for determining the condition of a road surface and syst will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1180891