Method and device for testing a substrate with a luminescent substance
AssigneeGiesecke+Devrient Currency Technology GmbH
InventorsWolfgang Rauscher, Peter Kersten, Thomas Giering
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Abstract
A method is provided for checking a substrate with a specified luminescent substance incorporated and/or applied areally. A substrate luminescent characteristic value for the substrate is ascertained, for which purpose a number N of luminescence intensity values are captured at respectively different locations on the value document, and the substrate luminescence characteristic value is ascertained in dependence on a rank order of the luminescence intensity values. It can be checked whether the substrate luminescence characteristic value meets a specified criterion.
Claims18
A method for checking a substrate, including a substrate for a value document or a substrate of a value document, with a specified luminescent substance incorporated and/or applied areally, in which a substrate luminescence characteristic value for the substrate is ascertained,
- wherein a number N of luminescence intensity values are provided at respectively different locations on the value document;
- wherein the method comprises measuring the luminescence intensity values with a luminescence sensor, ascertaining the substrate luminescence characteristic value in dependence on a rank order of the luminescence intensity values, and checking whether the substrate luminescence characteristic value meets a specified criterion;
- wherein the substrate luminescence characteristic value is largely independent from a capture location of the luminescence intensity value.
A method for checking a substrate with a specified luminescent substance incorporated and/or applied areally, in which a substrate luminescence characteristic value for the substrate is ascertained,
- wherein a number N of luminescence intensity values are provided at respectively different locations on the value document;
- wherein the method comprises measuring the luminescence intensity values with a luminescence sensor, ascertaining the substrate luminescence characteristic value in dependence on a rank order of the luminescence intensity values, and checking whether the substrate luminescence characteristic value meets a specified criterion;
- wherein
- for ascertaining the substrate luminescence characteristic value, a positive number p is specified with 0.4<p<1, and a value is ascertained below which or equal to which there lies at least a portion p of the luminescence intensity values and equal to which or above which there lies at least a remainder of the luminescence intensity values, and the substrate luminescence characteristic value is determined in dependence on the ascertained value;
- or
- for determining the substrate luminescence characteristic value, non-negative numbers p and q<1−p are specified with 0.4<p<1, and those of the luminescence intensity values are used which are greater than or equal to the p*N smallest ones of the luminescence intensity values and smaller than or equal to the q*N greatest ones of the luminescence intensity values, or those of the luminescence intensity values are used which are greater than the p*N smallest ones of the luminescence intensity values and smaller than or equal to the q*N greatest ones of the measurement values.
Dependencies are inferred from the claim text.