Detection of counterfeit US paper money using intrinsic fluorescence lifetime | Zendy

Thomas H. Chia | Zendy; Michael J. Levene | Zendy

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Detection of counterfeit US paper money using intrinsic fluorescence lifetime

Author(s) -

Thomas H. Chia,

Michael J. Levene

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.022054

Subject(s) - counterfeit , photon counting , fluorescence , optics , sample (material) , component (thermodynamics) , materials science , analytical chemistry (journal) , photon , physics , chemistry , chromatography , geography , archaeology , thermodynamics

Genuine U.S. Federal Reserve Notes have a consistent, two-component intrinsic fluorescence lifetime. This allows for detection of counterfeit paper money because of its significant differences in fluorescence lifetime when compared to genuine paper money. We used scanning two-photon laser excitation and the time-correlated single photon counting (TCSPC) method to sample a approximately 4 mm(2) region. Three types of counterfeit samples were tested. Four out of the nine counterfeit samples fit to a one-component decay. Five out of nine counterfeit samples fit to a two-component model, but are identified as counterfeit due to significant deviations in the longer lifetime component compared to genuine bills.

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