Multi-wavelength currency authentication system and method

Details Multi-wavelength currency authentication system and method Multi-wavelength currency authentication system and method

2007-08-14

2007-08-14

Lauchman, Layla G. (Department: 2877)

Optics: measuring and testing

Document pattern analysis or verification

C382S181000, C382S191000

Reexamination Certificate

active

10684027

ABSTRACT:
A counterfeit determination is made with respect to currency bills by illuminating the currency bill with multiple wavelengths of light. Genuine currency bills include indicia printed with an ink that responds similarly to infra-red illumination at two different wavelengths. To identify a test currency as a suspect counterfeit, the bill is first illuminated with infra-red light at a first wavelength. A measurement is then made of a first reflected light response from the first illumination. The test currency bill is then second illuminated with infra-red light at a second wavelength. A measurement is then made of a second reflected light response from the second illumination. The first and second reflected light responses are then compared, and the test currency bill is identified as a suspect counterfeit if the first and second reflected light responses are not substantially the same.

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PCT International Search Report for PCT/US 03/33038 dated Apr. 8, 2004.

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