Patent ID: 7430042

Claim:
A device for determining the properties of surfaces having: at least one first radiation means having at least one first radiation source which directs a predetermined radiation towards a measurement surface; at least one first radiation detector means which captures at least a portion of the radiation reflected and/or diffused off the measurement surface and emits at least one measurement signal which is characteristic of the reflected and/or diffused radiation, wherein said device includes at least one measurement means which determines an angular position of the device relative to the measurement surface, said measurement means is composed of at least one second radiation means which directs at least partially directional radiation at a predetermined angle towards the measurement surface; and at least one second radiation detector means having a predetermined radiation detector surface which at least partially captures the radiation emitting from said second radiation means and reflected off the measurement surface and determines its position on the second radiation detector surface, wherein only selected areas of the second radiation detector surface are irradiated with radiation with radiation from the second radiation means, wherein the location of said irradiated areas depends on the angular position of the device relative to the measurement surface.