Bam Bundesanstalt Fur Materialforschung Und-prufung

Dirk Hönig

Ralph Domnick

Uwe Beck

Andreas Hertwig

The present invention relates to a method and a corresponding apparatus for identifying a product () or information relating to the product (). In the method, a concealed code on the product () is identified, wherein the code is given by a set of ellipsometric parameters, and the method comprises the following steps of: measuring ellipsometric variables for at least one defined point () on a surface () of the product (), comparing the measured ellipsometric variables with at least one reference code, and determining a match between the measured ellipsometric variables and the reference code or one of the reference codes or determining a mismatch with each reference code.

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Gottingen, Germany

Dirk Hönig