真伪1元硬币识别检测器

利用涡流检测原理,设计了一种1元硬币真伪识别检测器,以解决自动投币机器因投入伪币所带来的经济损失。该检测器包括LC振荡电路、信号处理电路、微处理电路及外围控制电路四个组成部分。检测器通过测量硬币对振荡电路频率改变量的大小来识别硬币真伪。为了克服温漂、元器件老化及环境瞬时干扰的影响,引入了背景频率更新及中值滤波算法。试验结果表明,检测器稳定可靠,准确率高。

A Type of Detecting True and False Coin Device

In order to reduce the loss of an automatic coin machine for using a 1-Yuan false coin,a device is designed applying the eddy current theory.The device includes four modules: LC oscillating circuit,signal processing unit,microprocessor unit and External control circuit,which identifies false coins by the quantity of the circuit oscillation frequency changing.For overcoming temperature drift,component aging and environment disturbance,the algorithm adopts the technology of background frequency updating and M...