FIELD: optics.
SUBSTANCE: invention relates to optical methods of control and concerns sensor for checking of valuable document. Device includes at least, two photodetectors receiving light in different spectral ranges. To each of photodetectors detector lens is associated, which receives partial light beam collimated by light gathering optics and directs to corresponding photodetector so that detection area for various photodetectors is substantially aligned. Optical axes of detector lenses are located outside from optical axis of light beam so that collimated light beam laterally divided for at least two partial light beams.
EFFECT: technical result consists in reduction of dimensions of device.
14 cl, 8 dwg
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