Detecting luminescent security features

Details Detecting luminescent security features Detecting luminescent security features

1984-04-27

1987-03-17

Rosenberger, R. A.

Optics: measuring and testing

Document pattern analysis or verification

2504581, G06K 710

Patent

active

046503200

ABSTRACT:
Luminescent security features in or on documents are detected using a detector comprising a fibre optic light guide arranged to transmit an interrogation beam originating from a source onto a document to be tested; and a housing in which a photo-diode array is mounted to receive luminescence emitted from the document. The photo-diode array is connected to electronic circuitry for discriminating between luminescence due to a security feature and other luminescence emitted by the document and for determining that a security feature has been detected.

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