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Opt Express. 2009 Nov 23;17(24):22054-61. doi: 10.1364/OE.17.022054.

Detection of counterfeit U.S. paper money using intrinsic fluorescence lifetime.

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Department of Biomedical Engineering, Yale University, New Haven, CT 06511, USA.


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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