Device for determining the surface condition of a roadway
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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Abstract
A device for determination of the surface condition of a roadway includes 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.
14 Citations
24 Claims
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1. A device for determination of the surface condition of a roadway, the device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for determination of the surface condition of a roadway, the device comprising:
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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 ratio of the power of the light signal at the first wavelength to the power of the light signal at the third wavelength, and as a function of the ratio of the power of the light signal at the third wavelength to the power of the light signal at the second wavelength. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A device for determination of the surface condition of a roadway, the device comprising:
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a light-sensitive sensor to measure a light signal reflected from the surface of the roadway; and an analyzer that determines the surface condition of the roadway, wherein the determination is made using a function of the power of the light signal at a first wavelength in the infrared range, a second wavelength in the infrared range, and a third wavelength in the infrared range, as well 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. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification