Patent ID: 7652584
Filing Date: 2010-01-26
Classification: B60T,G01N,G06K,G08G

Abstract:
1. Sensor device for non-contact detection of conditions of a surface, the sensor device comprising: a light source for emitting light towards the surface; a first detector arranged for receiving a portion of said emitted light when reflected from said surface and producing a first output according to an intensity thereof; a second detector arranged for receiving a portion of said emitted light when reflected from said surface and for producing a second output according to the intensity thereof; and control means for receiving and evaluating the received output from the detectors based on an amount of diffuse reflected and mirror reflected light; wherein the light source is arranged to emit light in a direction within 20° from the surface normal, the sensor device further comprising: a first linear polarization filter arranged in a path of the light from the light source and to the surface for the polarization of the emitted light; and a second linear polarization filter arranged in a path of the light between said surface and one of the first detector and the second detector.