摘要：随着市场经济的高速发展，纸币在现如今的市场流通领域中担任着一个十分重要的角色，假币的制作水平伴随着技术的提高而提高，也越发的猖獗起来。

    本人首先对纸币防伪原理分别进行了分析，选用了荧光反应、安全线，红外穿透、磁分布等防伪手段，对各个不同的防伪手段进行了比较和分析，并选择了相对应的传感器。在采用单片机作为本设计处理器的前提下，设计了点钞机总体控制系统，实现了点钞机的点钞和验钞功能。43806

   本文点钞机设计选用的是以美国生产的单片机AT89S52为主控芯片的点钞控制系统。点钞控制系统采用多种方法鉴别伪币，采集系统采集荧光、紫外线、红外线、磁信号及安全线信号、进出钞和宽度等辅助信号变算放大后得到的数据，经过处理分析，将结果输送给单片机。由单片机给出控制信号来驱动控制系统执行机构动作，达到对钞票的计数辨伪目的。

毕业论文关键词： 防伪；纸币；点钞机；单片机

Language Learning

Abstract：With the rapid development of market economy, money in the present market circulation served as a very important role, counterfeit production level with the technology to improve and improve, more and more rampant.

I first of banknote anticounterfeiting theory were analyzed separately. Selection of the fluorescence response, safety line, through infrared, magnetic distribution and other security means, of different means of security were comparison and analysis, and select the corresponding sensor. In the use of single chip microcomputer as the premise of the design of the processor design counting machine control system overall, banknote counter, banknote checking function is realized.

Choose the currency count machine design is to U. S. production of single-chip microcomputer AT89S52 main control chip counting control system. Counting control system uses a variety of methods to identify the counterfeit money, data acquisition system to collect fluorescence, ultraviolet, infrared, magnetic signal and the signal line, import and notes and width etc. auxiliary signal variable amplifying obtained after analysis, after processing, the result is transmitted to the microcontroller. SCM is given by the control signal to drive the control system actuator, achieve the purpose of the banknote counting detection of forgeries.

KeyWords：Security; bills; currency-counting machine;s ingle chip microcomputer.

目 录

1  绪论 1

1.1  课题研究背景及意义 1

1.1.1  人民币流通的需求1

1.1.2  人民币防伪的需求1

1.2  人民币识别机器分类 2

1.3  机器基本识别手段 4

1.4  研究内容与设计特点 5

2  点钞机的基本原理 6

2.1  人民币介绍 6

2.1.1  人民币发行史6

2.1.2  第五套人民币防伪特征8

2.2  检测防伪技术 9

2.2.1  荧光检测9

2.2.2  磁性检测11

2.2.3  红外穿透检测12

2.3  辅助信号检测原理 14

2.3.1  纸币宽度检测原理14

2.3.2  进钞、接钞检测原理15

2.4  本章小结 16

3  点钞机总体结构的设计与选择 17

3.1  机械结构介绍 17

3.2  点钞机结构系统设计 18

3.2.1  结构选择18

3.2.2  传送方式的选择及传送比19

3.2.3  主要传动轴转速及转轮线速度的计算19

3.2.4  捻钞轮转动惯量的计算与实验验证21

3.2.5  钞票运行间隔运算21

3.3  点钞机材料的选择 23

3.3.1  外壳材料的选择23