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

Thermography

Modulation

Absorption

Data modeling

Forensic science

Infrared radiation

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