Apparatus for authenticating sheets

Image analysis – Applications – Reading paper currency

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356 71, G06K 900

Patent

active

060945001

ABSTRACT:
A self-service deposit terminal (10) is arranged to authenticate bank notes by exposing them to ultra-violet (UV) light which causes forged notes comprising wood-based paper to fluoresce. Each note (36) is individually transported between a UV light tube (38) and a first photo-diode (40). The level of light emitted by the UV light tube is monitored by a second photo-diode (52). The amplified output of this second photo-diode acts as a threshold value. The amplified outputs of both photo-diodes are applied to a Schmitt trigger (60) which outputs a high signal if the tested note is judged to fluoresce and a low signal if it does not. The output of the Schmitt trigger (60) is applied to a data processing means (24) which determines either solely on this output, or in conjunction with the output from other validation means, whether the tested note is genuine or not.

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patent: 5918960 (1999-07-01), Hopwood et al.

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