A Type of Detecting True and False Coin Device
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摘要: 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。Abstract: 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 Median filter. The experiment shows the device has the character of stability, reliability and high accuracy.
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Keywords:
- Eddy current testing /
- Coin detection /
- False coin /
- Median filter
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[1] 杨浩，刘洋.硬币检测传感器［J］.电子测量技术,2004(6):25-26. [2] 赵以强.公交车投币箱硬币鉴伪及币值识别系统设计［J］.农业装备与车辆工程,2009,211(2):34-36. [3] 王春芳，林金表，郑子武，等.基于AT89C51单片机的硬币高速检伪机［J］.机电工程技术,2006,35(4):29. [4] 武斌,龙在云,张一哲. 用于硬币鉴伪的固频涡流传感方法［J］.无损检测,2008,30(8):491-493. [5] 毕晓君,孙晓霞.基于蚁群算法的硬币识别研究［J］.哈尔滨工程大学学报,2006,27(6):883-885. [6] 刘美佳, 张迅航, 王岩.基于神经网络的硬币识别研究技术［J］.黑龙江工程学院学报(自然科学版),2007,21(2):58-60. [7] 于春和, 刘济林. 一种新型车辆泊位检测器［J］.传感技术学报,2004(4):693-695. [8] Yu C H, Zhang D P, Guo R. Occupancy Sensors in Carpark Based on Wireless Network［C］. The 9th Inernatiol Conference on SignalProcessing, 2008, Beijing:2808-2811. [9] Yang X H, Toh P S. Adaptive fuzzy multilevel median filter［J］. IEEE Trans On Image Processing,1995,4(5):680-682.
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