METHOD OF AUTHENTICATING BANKNOTES, BOND PAPER AND DOCUMENTS Russian patent published in 2011 - IPC G07D7/06 B41M5/00 G06K7/12 

FIELD: information technology.

SUBSTANCE: method involves probing availability of given marks through exposure to laser radiation with wavelength 510-540 nm and combined effect of laser radiation and microwave radiation, resonance splitting of the ground state of the NV-centre. The difference between fluorescence signals from said marks is measured. The authenticated object is moved in the control zone so that the point on the object which corresponds to dislocation of the authentication mark is exposed to the said laser radiation for a period of time. The positive effect is achieved due to, but not limited to, that the signal for measuring fluorescence intensity of said marks caused by modulation of the received resonance microwave radiation is obtained via synchronous detection with determination of the phase shift between said signal and said modulation signal, as well as due to that during synchronous detection, the constant of integration is considered approximately equal to the time the authentication mark is exposed to laser radiation when the authenticated object is moved through the authentication zone.

EFFECT: high degree of authenticating banknotes.

8 cl, 1 dwg, 1 ex