Abstract: A measurement device is described for the quality control of printed products, having a pair of optical channels that differ in their properties and operate simultaneously. Each optical channel comprises an illumination channel for illuminating a measurement location and a reflection channel that picks up the light reflected from the measurement location. The reflected light is directed to an evaluation unit, which is connected to the reflection channel, that analyzes the reflected radiation spectrally. Polarization filters arranged in one of the pairs of channels provides the difference in the optical properties between the two pairs of channels. The measuring device provides an increased number of obtainable measured values for further processing in a way that requires only a modest increase in the metrological outlay compared to other measuring devices of this type.
Type:
Grant
Filed:
September 14, 2000
Date of Patent:
March 18, 2003
Assignee:
MAN Roland Druckmaschinen AG
Inventors:
Franz Lampersberger, Karsten Wendt, Bernd Tielebörger, Rainer Tutsch, Peter Rakitsch, Hans Joachim Six, Jörg Sierks