Device and method for counterfeiting RMB based on fluorescence time-resolved imaging system

Abstract

The invention relates to a banknote identification device and a method based on a fluorescence time-resolved imaging system. The banknote identification device and the method based on the fluorescence time-resolved imaging system comprise a fluorescence excitation light path and a fluorescence detection optical path. A high frequency excitation light of a cosinusoidal modulation stimulates paper used for Renminbi(RMB)to produce fluorescence light with the same frequency and generate images on a light-sensitive surface of an image intensifier. A fluorescent screen of the signal modulation image intensifier and the high frequency excitation light of the cosinusoidal modulation achieve gains. A phase shift algorithm enables a charge coupled device (CCD) to collect a corresponding image sequence. A computer can calculate an average fluorescent life of a RMB sample according to a polar phase diagram analysis method. Finally, whether the RMB sample is true or not is judged through the average fluorescent lifetime. The banknote identification device and the method based on the fluorescence time-resolved imaging system have the advantages of being sensitive in detection method, and reliable in device. A measuring result has nothing to do with circumstances such as mechanical wrinkle, damage and pollutants on the surface of the banknote. The anti-jamming capability is strong. The banknote identification device and the method based on the fluorescence time-resolved imaging system are particularly suitable for detecting high imitation counterfeit money.

Description

technical field [0001] The invention relates to a device and method for identifying counterfeit RMB, in particular to identifying the authenticity of RMB paper by means of a fluorescence time-resolved imaging system and a fluorescence lifetime polar coordinate phase diagram analysis method. Background technique [0002] The RMB is a national business card. As far as the counterfeiting of a single item is concerned, regardless of the amount of money or the number of victims, fake RMB is the most harmful to society. There are two types of RMB authentication methods: civil defense and machine defense. Civil defense can be summarized as relying on human experience of "one look, two touch, three listen". At present, the commonly used machine-proof banknote identification method is the fluorescent light intensity discrimination method of the fluorescent mark area of ​​the banknote excited by ultraviolet light. However, this method has been used for decades and is very old. In the...

AI Technical Summary

Problems solved by technology

Therefore, there is a big gap between the status quo and technical reserves of RMB authentication methods and the reality of counterfeit banknotes, and the reality of combating counterfeit banknotes is very severe.

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