AT89S52单片机金属构件无损探伤系统设计
本课题从超声波的产生、发射、接收和物理性质出发，阐明了超声波无损探伤的检测机理，分析了超声波无损探伤的基本方法。基于A型脉冲反射式超声波无损探伤法，选用AT89S52单片机作为核心控制器件，完成对超声波发射电路、信号调理电路、超声波接收电路、A/D模数转换电路、RS-232串行通信接口电路的控制。选用LabVIEW虚拟仪器技术平台作为上位机管理软件，设计系统的前面板和程序框图，对超声波无损探伤的结果进行波形采集、处理和显示。32496
毕业论文关键词： 超声波无损探伤 AT89S52 LabVIEW
Abstract
In modern industry, metal materials are widely used in machinery, equipment, pipelines, automobile and other types of products in human lives. Because people have requirements for safety and quality of products , non-destructive testing technology has been rapidly developed. Ultrasonic nondestructive testing technology, also known as ultrasonic nondestructive testing, as one of the conventional non-destructive testing technology, widely used in production, the online service, quality monitoring and performance feedback of finished industrial products, greatly reducing the defect rate of products, improving the effectiveness of the industry.
This paper starts from how ultrasonic waves generates, how the waves are transmitted and received as well as its physical properties , clarifies the mechanism of ultrasonic nondestructive testing detects and analyzes the basic methods of ultrasonic NDT. A model based on ultrasonic pulse reflection nondestructive testing method, using AT89S52 microcontroller as the core control device, to complete and control the ultrasonic transmitter circuit, signal conditioning circuit, ultrasonic receiver circuit, A / D analog-digital conversion circuits, RS-232 serial communication interface circuits. Selecting LabVIEW virtual instrument technology platform as the PC management software, designing front panel and block diagram, to complete the waveform acquisition, processing and display of the results of ultrasonic NDT.
Keywords: Ultrasonic NDT AT89S52 LabVIEW
目 录
摘 要 I
Abstract II
1 绪论 1
1.1 课题研究背景及意义 1
1.2 超声波无损探伤国内外研究应用现状 3
1.3 本课题的主要研究内容 4
2 超声波无损探伤技术对比分析论证 5
2.1 超声波无损探伤的检测机理 5
2.2 超声波无损探伤的基本方法 7
2.3 超声波探头 11
3 系统设计方案分析论证 13
3.1系统硬件结构框图设计 13
3.2 单片机的选型 13
3.3 放大器的选型 14
3.4 A/D选型 15
3.5 通信接口的选型 15
4 系统的硬件结构设计 17
4.1单片机最小系统设计 17
4.2超声波发射电路设计 19
4.3限幅保护电路设计 20
4.4程控增益放大电路设计 21