Sensor and method for checking documents of value, sensor system and document of value processing device

A sensor for checking documents of value comprising:

• at least one radiation source, which is adapted to apply electromagnetic radiation to a document of value, and
• a detector having a multiplicity of detector elements arranged at different locations, which is adapted to record electromagnetic radiation emerging from the document of value in at least two different spectral ranges with position resolution, while generating for each of the spectral ranges a detector signal corresponding to an intensity of the recorded electromagnetic radiation in the respective spectral range, and
• an evaluation instrument,
• wherein the evaluation instrument is programmed
• to check a first feature provided on or in the document of value with the aid of the detector signals generated for at least one first spectral range, and
• to check a second feature provided on or in the document of value, while taking into account the detector signals generated for at least one second spectral range, and
• wherein the sensor is configured to provide a color channel-specific attenuation in the first spectral range relative to the second spectral range, and
• wherein the first feature is a window integrated into the document of value that is covered with a film, and wherein the evaluation instrument is configured to examine the window on a basis of the detector signal corresponding to the intensity of the recorded electromagnetic radiation in the first spectral range.