In addition to checking the number of banknotes, the money counter has an important function to distinguish the true and false of the banknote. In daily life, we often use a money counter to identify whether the coins we don't confirm are true or false. The money counter is therefore an indispensable helper. Not only in daily life, in modern business, the money counter is an essential financial device. In the bank, the role of the money counter is even more unnecessary. So how does the money counter distinguish the true and false of the banknote? Are they completely correct for the authenticity of banknotes? Today, follow the small series of finishing to carefully understand the working principle of the money counter to distinguish the true and false of the banknote.
1, fluorescence detection
The principle of fluorescence detection is to test the paper quality of the renminbi. RMB is made of special paper (including more than 85% of high-quality cotton). Counterfeit banknotes are generally made of plain paper after bleaching. The bleached paper will be fluorescent under ultraviolet light (blue light with wavelength of 365nm). The reaction (diffraction of blue light with a wavelength of 420-460 nm under the excitation of ultraviolet light), the renminbi has no fluorescence response. Therefore, using the ultraviolet light source to illuminate the moving banknotes and using the silicon photocell to detect the fluorescent reflection of the banknotes, the banknotes can be distinguished from each other. In order to remove the disturbance of the ambient light, it is necessary to set a color filter that transmits the wavelength and the fluorescent reflection wavelength of the counterfeit banknote in the appearance of the silicon photocell.
2, magnetic detection
The principle of magnetic detection is that some parts of large-valued real banknotes (20, 50, 100 yuan) are printed with magnetic ink. The magnetic properties of the moving banknotes are detected by a set of magnetic heads, and the magnetics are analyzed by the circuit to distinguish The true and false of the banknote.
3, infrared penetration detection
The principle of infrared penetrating is to use the renminbi paper to consolidate, the density is higher, and the thickness of the ink printed by the gravure technique is higher, so the absorption capacity of the infrared signal is stronger to distinguish the true and false of the banknote. The paper characteristics of the renminbi are different from the paper characteristics of the counterfeit banknotes. When the banknotes are penetrated by infrared signals, their absorption ability to the infrared signals will be different. Using this principle, the identification can be completed. It should be noted that the color and thickness of the ink also form the difference in infrared penetration capability. Therefore, it is necessary to perform mathematical operations and comparative analysis on the signals of the infrared penetration detection.
The above three methods are the most important working principle of the money counter to detect banknotes, in addition to laser detection and anti-sandwich detection. In short, with the development of technology, the detection of banknotes has reached a very accurate level, but the accuracy of detection is not 100%. Recently, some specific counterfeit money can not be distinguished by the bank staff. Not to mention the money counter as a financial device. At this time, we need to keep in mind the number of specific counterfeit currency, because only the number can indicate that the money is counterfeit.
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