目 录
摘要 ..........................................................................................................................................I
Abstract .................................................................................................................................II
第 1 章 绪论............................................................................................................................1
1.1 课题研究的背景和意义................................................................................................1
1.2 涡流检测技术及其新进展............................................................................................2
1.3 脉冲涡流国内外研究现状.........................................................................................4
1.4 脉冲涡流裂纹检测的优势及发展方向....................................................................5
1.5 论文体系结构及创新点............................................................................................6
1.6 本章小结....................................................................................................................7
第 2 章 裂纹脉冲涡流检测理论............................................................................................8
2.1 裂纹涡流检测基本原理.............................................................................................8
2.2 涡流检测等效电路分析............................................................................................9
2.3 脉冲涡流裂纹检测分析...........................................................................................10
2.3.1 模拟脉冲磁场的产生....................................................................................11
2.3.2 被测导体的涡流强度计算............................................................................11
2.3.3 线圈中的感应电压........................................................................................12
2.4 影响检测精度因素分析..........................................................................................13
2.4.1 激励线圈相关参数的影响............................................................................13
2.4.2 被测导体的影响............................................................................................13
2.4.3 提离效应的减少............................................................................................14
2.4.4 噪声对检测信号干扰....................................................................................14
2.5 本章小结..................................................................................................................14
第 3 章 数据采集系统硬件设计..........................................................................................15
3.1 设计数据采集系统的目的......................................................................................15
3.2 总体方案设计..........................................................................................................15
3.3 传感器模拟信号调理电路的设计..........................................................................16
3.3.1 前置放大电路模块........................................................................................16
3.3.2 带通滤波模块................................................................................................17
3.3.3 程控放大电路模块........................................................................................19
3.4 A/D 转换模块的设计...............................................................................................20
3.5 控制模块的设计......................................................................................................21
3.5.1 CPLD 控制电路设计........................................................................................21
3.5.2 单片机控制模块............................................................................................22
3.6 系统原理图及 PCB 图 ............................................................................................23
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