FIELD: physics.
SUBSTANCE: method of authenticating a polymer film comprises a step of measuring the thickness of a layer inside said film by white light interferometry. The method and devices to carry out the method may be used in security applications, for example to test for counterfeit banknotes.
EFFECT: improved method.
18 cl, 5 dwg
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Authors
Dates
2013-04-20—Published
2009-04-28—Filed