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Optical Engineering

Laser photothermal diagnostics of genuine and counterfeit British and United States banknotes
Author(s): Andreas Othonos; Andreas Mandelis; Marios Nestoros; Constantinos Christofides
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Paper 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.

Paper Details

Date Published: 1 February 1997
PDF: 8 pages
Opt. Eng. 36(2) doi: 10.1117/1.601212
Published in: Optical Engineering Volume 36, Issue 2
Show Author Affiliations
Andreas Othonos, Univ. of Cyprus (Cyprus)
Andreas Mandelis, Univ. of Toronto (Canada)
Marios Nestoros, Univ. of Cyprus (Cyprus)
Constantinos Christofides, Univ. of Cyprus (Cyprus)

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