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

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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