Authentication apparatus for value documents
US8400509B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2010 |
| Grant date | Mar 19, 2013 |
| Priority date | — |
| Expiry date | Apr 19, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/128
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A value document authentication apparatus and system that includes value document substrates having a uniform distribution of one or more phosphors that emit infrared radiation in one or more wavelengths, which can be measured at the same location on the value document that is illuminated by a phosphor exciting light source when the document passes the light source with a uniform velocity. The illumination and measurement locations on the value document can be offset. The measured infrared radiation as a series of overlapped measurements along a pre-selected track in the value document represents an intensity profile, which can be normalized after removing high variations. The normalized intensity profile of a test value document can be compared with normalized intensity profile from valid reference documents to authenticate the test value document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.