FIELD: detecting surfaces marked by special dyes for authenticating securities, bank notes, and documentary stamps. SUBSTANCE: method includes irradiation of surface being analyzed by exciting infrared radiation, filtering of reflected radiation except for anti-Stokes component which is then amplified and visualized by recording anti-Stokes radiation producing surface image marked by special phosphor. EFFECT: facilitated procedure. 2 cl, 3 dwg
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Authors
Dates
2003-02-27—Published
2000-08-16—Filed