【摘要】：印刷電路板(Printed Circuit Board,PCB)作為電子元器件中最常見的應(yīng)用是電子設(shè)備的基礎(chǔ)組成部分,它支撐著各種電子元器件的固定和裝配,實(shí)現(xiàn)元器件之間的布線和連接任務(wù),滿足系統(tǒng)工作所需的電氣特性。從PCB設(shè)計(jì)制造的整體流程上看,其很大一部分環(huán)節(jié)同PCB鉆孔的處理有關(guān),在當(dāng)前國民經(jīng)濟(jì)和電子科技高速發(fā)展的時代,PCB設(shè)計(jì)與制作正往小孔徑、窄線距、高密度、多層數(shù)方向發(fā)展,相應(yīng)的對PCB過孔質(zhì)量檢測技術(shù)提出了更高的要求,開發(fā)一種高精確度、高效穩(wěn)定的PCB過孔質(zhì)量檢測系統(tǒng)具有重要的現(xiàn)實(shí)意義。本文針對現(xiàn)有PCB過孔質(zhì)量檢測技術(shù)存在的缺陷,以連續(xù)太赫茲波為檢測光源,將太赫茲波通過PCB過孔后的強(qiáng)度成像結(jié)果作為評判依據(jù),提出了一種可用于檢測PCB過孔內(nèi)壁質(zhì)量的方法,經(jīng)過軟件數(shù)值仿真,初步驗(yàn)證了該方法的可行性。課題研究完成的工作如下:1.介紹了國內(nèi)外PCB過孔檢測技術(shù)的研究現(xiàn)狀,并對太赫茲波的特性、產(chǎn)生方法、探測手段等相關(guān)方面做了研究。2.以PCB過孔為研究對象,分析了太赫茲波在PCB過孔中的導(dǎo)光機(jī)理,討論了太赫茲波在標(biāo)準(zhǔn)過孔中的傳輸特性以及對于過孔內(nèi)壁存在孔化缺陷區(qū)域的太赫茲波傳輸特性,介紹了用有限元方法求解Helmholtz方程的過程。3.在對現(xiàn)有PCB過孔檢測系統(tǒng)和連續(xù)太赫茲波成像系統(tǒng)的研究基礎(chǔ)上,提出了基于連續(xù)太赫茲成像技術(shù)的PCB過孔內(nèi)壁質(zhì)量檢測系統(tǒng)架構(gòu),介紹了系統(tǒng)基本工作原理。4.運(yùn)用有限元仿真軟件COMSOL Multiphysics完成了對不同尺寸、不同缺陷程度PCB過孔的連續(xù)太赫茲波強(qiáng)度成像仿真,分析了孔徑大小、PCB厚度、內(nèi)壁缺陷大小及位置對成像結(jié)果的影響,獲得了PCB過孔內(nèi)壁質(zhì)量檢測的評判依據(jù),完成了對本文提出的檢測系統(tǒng)的可行性驗(yàn)證。
[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.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN41

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本文編號：2357251