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Annular coded aperture imaging technology and digital reconstruction

Author: TianXiaoDong
Tutor: HuJiaSheng
School: Dalian University of Technology
Course: Communication and Information System
Keywords: X-ray imaging Inertial confinement fusion Coded aperture imaging Wiener filter
CLC: TP391.41
Type: Master's thesis
Year: 2003
Downloads: 126
Quote: 2
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Abstract


X-ray imaging is often used to diagnose inertial confinement fusion target goals. Need a high spatial resolution and fast time resolution of the imaging system , in order to probe the laser drive implosion fluid dynamics process in inertial confinement fusion . Most materials due to the very short wavelength of X-ray , the X-ray refractive index slightly less than 1, and easily absorbs strongly in the air and the medium , so the X-ray region is difficult to find a suitable imaging lens , the X - ray imaging the transmission or reflection imaging method can be employed . Ring coded aperture the representatives transmission imaging method , is a better solution in the X-ray imaging technology . Retain the high - resolution and high signal - to - noise ratio under the premise , orders of magnitude increase in its light collecting efficiency can be obtained in a weak X-ray image of the target . The main purpose of this study is to develop a ring coded aperture microscope get laser controlled fusion process at all stages of the high-quality image , and provide a basis for further study of the laws of fluid dynamics in the ICF . The coded aperture imaging is actually a two-step imaging process, the first step is to use X-ray coded aperture camera to gather as much information of the X-ray source (target) , the target overlap like . The second step is to use optical methods or computer for processing and reconstruction of the obtained overlapping like , in order to restore the clear image of the original target , this article uses a Wiener filtering method in the image restoration and decoding . The annular aperture encoding microscope aperture coded imaging technology , and its circular aperture is a combination of thick photolithography and plating made ??. The imaging equipment as X-ray imaging and diagnostic technology , mainly used in inertial confinement fusion (ICF) , can achieve high spatial resolution of the measured target (5-10μm) imaging . This article prepared coded aperture imaging microscopy has been successfully applied to the \the practical degree requirements , but also proved correct theory of the ring coded aperture microscope design , science and technology .

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