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Device for determining the surface condition of a roadway

  • US 7,615,750 B2
  • Filed: 09/08/2005
  • Issued: 11/10/2009
  • Est. Priority Date: 09/09/2004
  • Status: Active Grant
First Claim
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1. A device for determination of the surface condition of a roadway, the device comprising:

  • a light-sensitive sensor to measure a light signal reflected from the surface of the roadway; and

    an analyzer to determine the surface condition of the roadway as a function of the power of the light signal at a first wavelength in the infrared range, at a second wavelength in the infrared range, and at least a third wavelength in the infrared range, wherein the device is operable to determine the surface condition of the roadway by means of the analyzer as a function of the ratio of the power of the light signal at the first wavelength to the power of the light signal at the second wavelength, as a function of the power of the light signal at the first wavelength, as a function of the power of the light signal at the second wavelength, and as a function of the power of the light signal at the third wavelength.

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