| 摘要 |
The invention relates to methods and apparatuses for testing the authenticity of objects printed with security ink, for example bank notes, security documents, identification documents or documents of value, by measuring light emanating from, in particular reflected or transmitted by, an object to be checked. To guarantee especially reliable authenticity testing it is provided that light emanating from the object to be checked is detected in spectral regions outside the visible spectral region. To obtain easily operated and safe authenticity testing in addition, it is provided that light emanating from the object is detected at a plurality of places on the object in at least two selected spectral regions, a test series being produced for each spectral region, two test series adapted to each other, and authenticity testing then performed by comparing the adapted two test series. An especially compact, easily operated and easily adjusted apparatus is characterized in that at least one diaphragm is provided between object and detector for adjusting the size of an area to be examined on the object.
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