本文選題：光學相干斷層成像 + 三防漆　； 參考：《蘇州大學》2016年碩士論文

【摘要】：光學相干斷層成像技術(Optical Coherence Tomography,OCT)是基于低相干光干涉的光學成像技術,能夠實現(xiàn)對材料的散射結構進行非接觸和高分辨率的三維成像。目前OCT主要包括兩種,譜域OCT和掃頻OCT(Swept-source OCT)。其中,掃頻OCT憑借更快的速度和更小的信號處理量而受到越來越多的關注和采用。掃頻OCT在掃描成像速度、靈敏度以及分辨率上都能夠滿足電子制造行業(yè)對于無損檢測的要求。三防漆(Conformal Coating)是汽車電子行業(yè)中經(jīng)常使用到的一種透明和或半透明材料,它可以鎖住印刷電路板和空氣界面層的水分子,隔絕水汽的滲入,減小電路板表面發(fā)生離子遷移和腐蝕的可能性。但是,如果電路板上三防漆的涂層質量有問題,反而會加速電路板表面的離子遷移,從而導致印刷電路板上電路短路的后果。目前對于三防漆的質量管控仍然沒有一個有效的辦法,由三防漆質量而導致電子控制單元(Electronic Control Unit)不能滿足設計、生產(chǎn)和使用的情況時有發(fā)生。本論文中將掃頻OCT的系統(tǒng)性能和三防漆的物理特性相結合,搭建了一套掃頻OCT測試系統(tǒng)平臺,其縱向分辨率為13.48μm,其在三防漆中的成像深度達到了2.68mm,完全滿足三防漆的分析需求。同時,設計了對于三防漆中常出現(xiàn)的氣泡、分層、厚度不均勻以及固化不完全等現(xiàn)象的OCT分析方法,對于氣泡和分層利用邊緣檢測和邊界跟蹤獲取其界面的不規(guī)則形狀;對于厚度不均勻利用OCT可縱向成像的特性對其進行縱向深度測量;對于固化不完全利用OCT在深度方向上的信號衰減系數(shù)表達三防漆由表及里的固化狀態(tài),并成功的進行了一些列實驗和對比分析,證明了掃頻OCT具有對三防漆涂覆質量進行無損檢測的潛力。
[Abstract]:Optical coherence Tomography tomography (OCTT) is an optical imaging technique based on low coherent light interference, which can realize the non-contact and high-resolution three-dimensional imaging of the scattering structure of materials. At present, OCT mainly includes two kinds, spectral OCT and sweep OCT(Swept-source OCTT. Among them, frequency-sweeping OCT is paid more and more attention because of its faster speed and smaller signal processing capacity. Sweep OCT can meet the requirements of nondestructive testing in electronic manufacturing industry in terms of scan imaging speed, sensitivity and resolution. Formal Coatingis a transparent and semitransparent material often used in the automotive electronics industry. It can lock up water molecules in printed circuit boards and air interfacial layers and insulate the infiltration of water vapor. Reduce the possibility of ion migration and corrosion on the surface of circuit board. However, if the coating quality of the three coatings on the circuit board is defective, the ion migration on the surface of the circuit board will be accelerated, which will lead to the circuit short circuit on the printed circuit board. At present, there is still no effective way to control the quality of three-proof paint. The electronic Control unit can not satisfy the design, production and use. In this paper, the system performance of frequency-sweeping OCT is combined with the physical characteristics of three-anti-paint, and a OCT testing system is built. The longitudinal resolution of the system is 13.48 渭 m, and the imaging depth in the three-anti-paint is 2.68 mm, which fully meets the requirement of the analysis of three anti-paint. At the same time, the OCT analysis method is designed for bubble, stratification, uneven thickness and incomplete solidification, which often appear in the three anti-paint systems. For bubble and stratification, the irregular shape of the interface is obtained by edge detection and boundary tracking. For thickness inhomogeneity, the longitudinal depth of OCT can be measured by using the characteristics of longitudinal imaging, and the curing state is expressed by using the signal attenuation coefficient of OCT in the depth direction from the outside to the inside. Some series of experiments and comparative analysis have been successfully carried out, and it is proved that the sweep frequency OCT has the potential of nondestructive testing for the coating quality of three antipaint coatings.
【學位授予單位】：蘇州大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U463.6;O436.1

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