目 录
前 言 …………………………………………………………………………………….1
1 分析探测金属的理论根据………………………………………………………………...2
1.1 理论描述………………………………………………………………….…………..2
1.1.1 线圈介质条件变化.............................. ...................................................................2
1.1.2 涡流效应..…………………………………………………….……….………….3
2 硬件电路设计………………………………………..…………………………………….3
2.1 系统组成.......................................................................................................................3
2.2 硬件电路功能描述………………………………………….……………….….……4
2.2.1 线圈振荡电路..…………………………………………….……………....……..4
2.2.2 数据采集..…………………………………………………………..…….………5
2.2.3 A/D 转换电路..…………………………………………………..…………...…..8
2.2.4 系统控制单元.....................................................................................................11
2.2.5 键盘控制电路..………………………….……………………….…………...…12
2.2.6 显示报警电路.......................................................................................................13
2.2.7 电源电路...............................................................................................................14
2.3 整机工作原理描述......................................................................................................15
3 系统软件设计…………………………………………………………………………....16
3.1 软件设计思想..............................................................................................................16
3.2 数字滤波及算法说明..................................................................................................16
3.3 主程序流程图..............................................................................................................17
3.3.1 键盘控制程序设计 ................................................................................................18
3.3.2 数字滤波程序设计 ................................................................................................19
3.3.3 显示与报警程序设计 ............................................................................................20
4 主要技术指标分析………………………………………………………………..……..21
4.1 主要技术指标分析......................................................................................................21
4.4.1 工作频率 ................................................................................................................21
4.4.2 灵敏度分析 ............................................................................................................21
4.4.3 稳定性分析 ............................................................................................................22
5 仿真、调试结果及分析……………………………………………………………...….22
