Only a small variation of the coating thickness in a range of a nanometer can create an inhomogeneity visible to the human eye. This control task is especially difficult as this uniformity must be controlled on the full glass surface, in different viewing angles and on the complete production lot to avoid any claims and improve the process. The new “Color Channel” technology by ISRA is able to provide all that.
Furthermore the systems enable the optical inspection of the color angle shift by using the patented multi-view technology, and in addition for a complete homogeneity control of the fully coated surface by using the so called Large Area Inspection (L.A.I.), a special supersampling method.
The advantages in short: no additional cameras or illumination setups are needed. A complete, in-process surface angle shift control is given, by using narrow and wide view angles. As well the homogeneity control is not influenced by small defects and allows even for the reliable detection of low contrast defects.
Systems for surface color monitoring allow for the automated in-process identification of the slightest color deviations. Defects are reliably identified on the complete surface, recorded and then visualized. The line operator is able to analyze defect trends and adjust production parameters accordingly. Other methods such as spectrometer measurements are not able to match the precision, efficiency and speed provided by “Color Channel” technology.
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Multi-mode, multi-dimension, multi-view inspection to ensure highest quality in color coating processing
The use of coated glass has risen significantly in many applications during the last decades. This is why perfect coating and highest glass quality are a must to maintain the competitive edge. One of the new challenges for coated glass producers is to guarantee color homogeneity of the production.