基于太赫兹成像的PCB板过孔内壁质量检测技术的研究

发布时间：2018-11-25 20:11

【摘要】：印刷电路板(Printed Circuit Board,PCB)作为电子元器件中最常见的应用是电子设备的基础组成部分,它支撑着各种电子元器件的固定和装配,实现元器件之间的布线和连接任务,满足系统工作所需的电气特性。从PCB设计制造的整体流程上看,其很大一部分环节同PCB钻孔的处理有关,在当前国民经济和电子科技高速发展的时代,PCB设计与制作正往小孔径、窄线距、高密度、多层数方向发展,相应的对PCB过孔质量检测技术提出了更高的要求,开发一种高精确度、高效稳定的PCB过孔质量检测系统具有重要的现实意义。本文针对现有PCB过孔质量检测技术存在的缺陷,以连续太赫兹波为检测光源,将太赫兹波通过PCB过孔后的强度成像结果作为评判依据,提出了一种可用于检测PCB过孔内壁质量的方法,经过软件数值仿真,初步验证了该方法的可行性。课题研究完成的工作如下:1.介绍了国内外PCB过孔检测技术的研究现状,并对太赫兹波的特性、产生方法、探测手段等相关方面做了研究。2.以PCB过孔为研究对象,分析了太赫兹波在PCB过孔中的导光机理,讨论了太赫兹波在标准过孔中的传输特性以及对于过孔内壁存在孔化缺陷区域的太赫兹波传输特性,介绍了用有限元方法求解Helmholtz方程的过程。3.在对现有PCB过孔检测系统和连续太赫兹波成像系统的研究基础上,提出了基于连续太赫兹成像技术的PCB过孔内壁质量检测系统架构,介绍了系统基本工作原理。4.运用有限元仿真软件COMSOL Multiphysics完成了对不同尺寸、不同缺陷程度PCB过孔的连续太赫兹波强度成像仿真,分析了孔径大小、PCB厚度、内壁缺陷大小及位置对成像结果的影响,获得了PCB过孔内壁质量检测的评判依据,完成了对本文提出的检测系统的可行性验证。
[Abstract]:As the most common application of electronic components, printed circuit board (Printed Circuit Board,PCB) is the basic part of electronic devices. It supports the fixing and assembling of various electronic components, and realizes the tasks of wiring and connecting between components. Meet the electrical characteristics required for system operation. Judging from the overall process of PCB design and manufacture, a large part of it is related to the processing of PCB boreholes. In the current era of rapid development of national economy and electronic science and technology, the design and manufacture of PCB is going to small aperture, narrow line spacing, high density. With the development of multilayer, it is necessary to develop a high precision, high efficiency and stable PCB quality detection system for PCB. In this paper, aiming at the defects of the existing PCB perforation quality detection technology, the intensity imaging results of the terahertz wave passing through the PCB hole are taken as the basis for judging the intensity imaging results after the continuous terahertz wave is used as the detection light source. A new method is proposed to detect the quality of PCB through the hole wall. The feasibility of the method is verified by numerical simulation. The research work is as follows: 1. This paper introduces the research status of PCB perforation detection technology at home and abroad, and studies the characteristics, generation methods and detection methods of terahertz wave. 2. The light conduction mechanism of terahertz wave in PCB perforation is analyzed, and the propagation characteristics of terahertz wave in standard perforation and the propagation characteristics of terahertz wave in the region with porous defects in the inner wall of the hole are discussed. The process of solving Helmholtz equation by finite element method is introduced. Based on the research of the existing PCB perforation detection system and the continuous terahertz wave imaging system, the architecture of the PCB through hole inner wall quality detection system based on the continuous terahertz imaging technology is proposed, and the basic working principle of the system is introduced. 4. The continuous terahertz wave intensity imaging of PCB holes with different size and different defect degree is simulated by using finite element simulation software COMSOL Multiphysics. The influence of aperture size, PCB thickness, inner wall defect size and position on the imaging results is analyzed. The evaluation basis of PCB through hole inner wall quality detection is obtained, and the feasibility of the system proposed in this paper is verified.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN41

【共引文献】