Patent ID: 6744050
Filing Date: 2004-06-01
Classification: G07D

Abstract:
A method for testing a paper of value, comprising the steps of:a) irradiating a paper of value located in a measuring plane in first and second areas, the second area being identical, in overlap or adjacent with the first area; b) detecting the radiation transmitted through the paper of value in a bright field in the first area by means of a detector located in the direct radiation range of a radiation source; c) detecting the radiation transmitted through the paper of value in a dark field in the second area by means of a detector located outside the direct radiation path of the radiation source; d) repeating steps a) to c) with respect to other first and second areas of the paper of value; e) evaluating the transmitted radiation detected in the first and second areas; and f) comparing the evaluation results from the detection of the radiation in the first and second areas and determining whether paper of value material is present in said first and second areas.