Method for producing value documents, and sensor system for quality control during the production of value documents

A method for producing value documents, in particular banknotes, comprising the following steps:

• providing at least one first semifinished product,
• capturing a first optical radiation emanating from the first semifinished product with at least one first sensitivity and at least one first resolution of temporal, spatial and/or spectral properties of the first optical radiation, and
• testing the first optical radiation on the basis of a first test criterion and, if the first test criterion is satisfied,
• introducing and/or applying at least one feature substance into and/or onto the first semifinished product, wherein a value document or a second semifinished product usable for producing a value document is obtained in which the feature substance is invisible to the naked eye,
• capturing a second optical radiation emanating from the value document or the second semifinished product with at least one second sensitivity and at least one second resolution of temporal, spatial and/or spectral properties of the second optical radiation, and
• testing the second optical radiation on the basis of at least one second test criterion and, if the at least one second test criterion is satisfied, releasing the value document for circulation or releasing the second semifinished product for use in the production of a value document,
• wherein
• the first sensitivity is greater than the second sensitivity and/or
• the first resolution is less than the second resolution, and/or
• the testing of the first optical radiation with regard to the temporal, spatial and/or spectral properties of the first optical radiation is less selective than the testing of the second optical radiation with regard to the temporal, spatial and/or spectral properties of the second optical radiation.

A sensor system for quality control during the production of value documents which involves at least one feature substance being introduced into and/or applied onto a first semifinished product in order to obtain a value document or a second semifinished product usable for producing a value document,

• wherein the sensor system comprises at least one capture apparatus for capturing optical radiation and at least one test apparatus for testing the captured optical radiation and is operable in a first operating mode and in a second operating mode, wherein
• in the first operating mode the at least one capture apparatus captures a first optical radiation emanating from the first semifinished product with at least one first sensitivity and at least one first resolution of temporal, spatial and/or spectral properties of the first optical radiation, and the at least one test apparatus tests the first optical radiation on the basis of a first test criterion and generates and/or outputs a first test signal, which is dependent on whether the first test criterion is satisfied, and
• in the second operating mode the at least one capture apparatus captures a second optical radiation emanating from the value document or from the second semifinished product with at least one second sensitivity and at least one second resolution of temporal, spatial and/or spectral properties of the second optical radiation, and the at least one test apparatus tests the second optical radiation on the basis of at least one second test criterion and generates and/or outputs a second test signal, which is dependent on whether the at least one second test criterion is satisfied, and wherein
• the first sensitivity is greater than the second sensitivity and/or
• the first resolution is less than the second resolution and/or
• the testing of the first optical radiation with regard to the temporal, spatial and/or spectral properties of the first optical radiation is less selective than the testing of the second optical radiation with regard to the temporal, spatial and/or spectral properties of the second optical radiation.