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How does the vending machine identify the face value and the authenticity of the invested money
When using a vending machine to buy something, every time a coin is thrown in, how does it determine how much of the coin is? How does the banknote determine the face value? And... how is the authenticity determined? ? Coin detection mainly starts from three aspects: size, material, and weight. Needless to say the size of , the counterfeit currency can't pass this level is just looking for death. The material detection relies on electromagnetic characteristics. Since the genuine coin uses a special mixed metal material, a specially designed high-frequency oscillator circuit can be used to distinguish the magnetic impedance of the material more efficiently. In order to screen out counterfeit coins. In addition, there is a small mystery here. The magnetoresistance of the coin is also related to the size, and the size detection is completed in disguise. The comparison of weight is more interesting. The vending machine is designed with a coin'track', and only when the size and density match, the coil can pass through the specified speed range. Otherwise, it is fake~ The recognition of denominations and the recognition of real and fake banknotes can be done at the same time. There are dozens of identifiable features in most domestic and foreign banknotes, including various watermarks, various embedded materials, various pattern details, various concave-convex engravings, and various fluorescent patterns. At the time of recognition, the basic recognition methods include size recognition, pattern recognition, optical recognition, magnetic recognition, etc. Nowadays, currency detectors generally select some of the characteristics to recognize. If the recognition is successful, the authenticity of the banknote will be If you know it, you will know the denomination. This article is organized by a vending machine. The opinions in this article do not represent the views of this site. Previous article: Why do vending machines sell drinks more expensively than supermarkets?