Patent ID: 8422003

Claim:
A device for classification of a transparent component of a moving material flow comprising: an optical detector unit with an allocatable optical axis directed toward the moving material flow; at least one illumination unit for illuminating the material flow from a space spanning over the moving material flow also containing the optical detector unit; a classifier, for classifying the component based on information which is recorded from the component using the optical detector unit and at least one decision criterion for providing the classification of the moving material flow; a retroreflector located in a detector viewing direction behind the moving material flow at least along the optical axis of the detector unit; and wherein the illumination unit includes at least two light sources which each illuminate the material flow with different light beams, with a first light source emitting light of a first type and a second light source emitting light of a second type; the light of at least the first light source is incident on the moving material flow longitudinally relative to the optical axis; the optical detector unit selectively detects the light of both light sources; and the light of the second light source illuminates the moving material flow with incident light wherein the light of the second source is incident to illuminate an area of the moving material flow and is not incident longitudinally relative to the optical axis of the detector unit.