Examining method for the wear-condition of data carriers

Details Examining method for the wear-condition of data carriers Examining method for the wear-condition of data carriers

1985-10-08

1987-03-17

Punter, William H.

Optics: measuring and testing

Infrared and ultraviolet

356 71, G01N 2117

Patent

active

046503196

ABSTRACT:
A method for examining the degree of wear of banknotes containing printing translucent with respect to light in the invisible spectral range. The method comprises irradiating the bank note with light containing portions of the invisible spectral range, such as infrared light; collecting the reflected portion of the applied light; and evaluating same for determining the wear condition of the banknote.

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patent: 4184081 (1980-01-01), Bergamini
patent: 4189235 (1980-02-01), Guter et al.

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