基于差动变压器的硬币鉴伪及币值识别系统---------外文翻译(外文原文+中文翻译).docVIP

a href=/word文档/a 外文翻译 学生姓名 方鸿宇 学院名称 机电工程学院 专业名称 工业设计 指导教师 李付星 2011年 5月 27日 附录 附录1 No public transport ticketing system has a lot to promote use of car, bus companies have given fake coins causing huge economic losses, these problems also exist in the vending machines, pay phones, game consoles, bank coin sorting machine.Real-time, accurate, and automate the identification of coins and currency counterfeit Kam, is technically achievable.The characteristics of a coin material, weight, color, thickness, diameter and surface patterns, etc., which can be used to identify coins.In order to achieve both coins and currency counterfeit identification Kam, the main use of coins in the material characteristics.Eddy current sensor is used most in the form of access to the sensor coil as the inductor three-capacitor oscillator circuit, the application of resonant oscillation frequency measurement circuit.Every dollar coin has a characteristic oscillation frequency, will they advance into the single chip EPROM.When the coin through the sensor, the oscillation frequency of circuit changes, the measured oscillation frequency and characteristics of oscillation frequency compared to determine the authenticity of coins and currency.But the oscillation circuit is affected by temperature and other environmental factors influenced this aspect of baseline characteristics reduced the oscillation frequency stored adaptability, it also makes the measurement of the oscillation frequency fluctuation larger.Thus, temperature and other environmental factors will cause the system error rate to increase, even complex temperature compensation, the effect is not very satisfactory.This paper was developed based on pseudo-differential transformer Kam coins and currency identification system, the main technical requirements: a strong ability to identify counterfeit coins; able to correctly distinguish the 6 currently in circulation coins, and has a certainflexible to adapt to the ne