FIELD: physics.
SUBSTANCE: paper sheet authentication device determines the type of the paper sheet using a characteristic different from the fluorescent light characteristic, sequentially emits the excitation light at different wavelengths per sheet of paper, measures the light intensity for each wavelength in a predetermined range emitted by the fluorescent material applied to the sheet of paper, and obtains these fluorescent light characteristics as a result. The paper sheet authentication device performs the authentication of the paper sheet using the data of the fluorescent light characteristic of the original paper sheet stored in advance for each type of paper sheet or the threshold value calculated from them and the obtained fluorescent light characteristic data.
EFFECT: paper sheet authentication device has a simple structure that allows to authenticate quickly different types of paper sheets, on which fluorescent materials are applied.
12 cl, 16 dwg
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