Testing apparatus for an item in sheet form

Details Testing apparatus for an item in sheet form Testing apparatus for an item in sheet form

G - Physics

01

N

73/55

G01N 21/25 (2006.01) G07D 7/20 (2006.01)

Patent

CA 2015148

ABSTRACT TESTING APPARATUS FOR AN ITEM IN SHEET FORM For automatic recognition of the authenticity of items in sheet form such as bank notes, for example in an automatic service machine, the transparency of each bank note is examined in predetermined spectral ranges. The measuring system is arranged between units of a transport system and, in a passage opening formed from a collector and a diffuser, produces a narrow read-out light beam which extends transversely over a scanning plane. The bank note is conveyed through the read-out light beam, and the light which shines through the bank note in the read-out area is collected in the collector and passed to a photosensitive detector. An evaluation device forms a single measurement value in respect of transparency in the spectral range for each of the successively scanned read-out areas, and compares the measurement values of the bank note being tested with pattern signals stored in a memory of the evaluation device.

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