Method of authenticating a polymer film

Details Method of authenticating a polymer film Method of authenticating a polymer film

G - Physics

01

B

G01B 11/06 (2006.01) G01N 21/23 (2006.01) G01N 21/45 (2006.01) G07D 7/16 (2006.01)

Patent

CA 2725407

A method of authenticating a polymer film comprises measuring the thickness of a layer therein by white light interferometry and/or measuring the birefringence of a layer therein. The method, and devices to carry out the method, may be used in security applications, for example to test for counterfeit bank notes.

L'invention porte sur un procédé d'authentification d'un film polymère qui comporte la mesure de l'épaisseur d'une couche dans celui-ci par une interférométrie de lumière blanche et/ou la mesure de la biréfringence d'une couche dans celui-ci. Le procédé et des dispositifs pour exécuter le procédé peuvent être utilisés dans des applications de sécurité, par exemple pour analyser des billets de banque contrefaits.

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