Checking the authenticity of value documents

A test sensor for testing a value document or authenticity, comprising:

• a test radiation source adapted to produce a test radiation which is remitted by the value document at least partially in a detection spectral range of the test sensor;
• an excitation radiation source adapted to produce an excitation radiation which causes a luminescence feature present in or on the value document to emit an emission radiation in the detection spectral range;
• a scanning unit adapted to scan test radiation remitted and emission radiation emitted by the value document in the detection spectral range;
• and
• an evaluation unit adapted to classify the value document as authentic or inauthentic;
• wherein the test sensor is adapted, while the value document is guided past the test sensor, to repeat a scanning sequence multiple times within the scope of which the value document is irradiated by the test radiation source and by the excitation radiation source in a first irradiation phase and is irradiated only by the excitation radiation source in a second irradiation phase,
• wherein the scanning unit scans at least one location-dependent remission spectral value in the first irradiation phase and scans at least one location-dependent emission spectral value in or after the second irradiation phase,
• wherein the evaluation unit is adapted to classify the value document as authentic or inauthentic on the basis of the at least one location-dependent remission spectral values scanned multiple times in spatially resolved manner and the at least one location-dependent emission spectral values scanned multiple times in spatially resolved manner;
• wherein the at least one location-dependent remission spectral value comprises proportions of remitted test radiation and proportions of the emission radiation of the luminescence feature;
• wherein a duration of the first irradiation phase is shorter than a duration of the second irradiation phase.

A method for testing a value document, which is guided past a test sensor in a transport direction, wherein a luminescence feature is present in substantially homogeneously distributed manner in or on a security region extending over the value document in the transport direction, wherein a scanning sequence that repeats itself multiple times upon guiding the value document past the test sensor, comprising the steps of:

• irradiating a test region of the test sensor that overlaps the security region at least partially with an excitation radiation and a test radiation in a first irradiation phase, wherein the test radiation is arranged to be remitted by the value document at least partially in a detection spectral range of the test sensor, and the excitation radiation is arranged to cause an emission radiation of the luminescence feature in the detection spectral range;
• scanning at least one location-dependent remission spectral value in the test region in the first irradiation phase;
• irradiating the test region only with the excitation radiation in a second irradiation phase;
• and
• scanning at least one location-dependent emission spectral value in the test region after the first irradiation phase;
• wherein a time duration of the first irradiation phase is between 0.5 μs and 500 μs, and a ratio between the time duration of the first irradiation phase and a time duration of the scanning sequence is between 1:1000 and 1:4, wherein a transport speed at which the value document is guided past the test sensor is between 1 m/s and 13 m/s.