Laser photothermal diagnostics of genuine and counterfeit British and United States banknotes

Andreas Othonos; Andreas Mandelis; Marios Nestoros; Constantinos Christofides

doi:10.1117/1.601212

1 February 1997 Laser photothermal diagnostics of genuine and counterfeit British and United States banknotes

Andreas Othonos, Andreas Mandelis, Marios Nestoros, Constantinos Christofides

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Optical Engineering, Vol. 36, Issue 2, (February 1997). https://doi.org/10.1117/1.601212

Laser-induced, frequency-scanned IR photothermal radiometry was used to investigate the thermophysical properties of the paper on which several genuine and counterfeit British (£10) and U.S. ($50, $100) currency bills were printed. The radiometric photothermal amplitudes and phases were further compared with a theoretical model, which yielded simultaneous quantitative measurements of the thermal diffusivities and conductivities of the bills. Both statistical and single-specimen results demonstrated the excellent thermophysical resolution of the technique with prospects for its use in the nonintrusive, on-line identification of counterfeit banknotes.

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Andreas Othonos, Andreas Mandelis, Marios Nestoros, and Constantinos Christofides "Laser photothermal diagnostics of genuine and counterfeit British and United States banknotes," Optical Engineering 36(2), (1 February 1997). https://doi.org/10.1117/1.601212

Published: 1 February 1997

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