毛细管聚焦特性及其X射线荧光与纳米全场成像应用研究

发布时间：2018-01-02 17:38

本文关键词：毛细管聚焦特性及其X射线荧光与纳米全场成像应用研究　出处：《中国科学院研究生院(上海应用物理研究所)》2017年硕士论文　论文类型：学位论文

【摘要】：特殊加工的毛细管利用X射线在管壁材料和空气界面的全反射特性,通过改变X射线的传播方向对X射线进行调控,从而实现X射线的聚焦和准直。毛细管可以实现X射线的宽带传输和广角(360度)传输,并且结构简单、造价低廉、传输效率高(一般高于90%)。根据光通道数量的不同,可以将毛细管分为单毛细管和多毛细管。单毛细管具有聚焦光斑小、增益高、体积小等优点。而多毛细管是由一簇横截面呈六方形状的空心玻璃纤维管紧密排列而组成的毛细管阵列。它接收面大,X射线利用率高,但聚焦光斑较大。因此,毛细管聚焦在同步辐射X射线、X射线光管的聚焦和成像中都有广泛的应用。本论文着重研究毛细管的聚焦特性及其在X射线荧光成像和纳米全场成像中的应用。论文依托上海同步辐射光源和实验室X射线光源,完成了以下方面的研究:1.较为系统地研究了单毛细管、多毛细管的聚焦特性,给出了不同毛细管的焦深、聚焦光斑尺度及其对荧光成像和全场纳米成像的影响。2.搭建了基于单毛细管聚焦的同步辐射X射线荧光成像系统以及基于多毛细管聚焦的实验室光源X射线荧光成像系统,实现了对碘溶液等测试样品的荧光扫描成像、荧光CT成像。模拟研究了不同算法对实验室光源荧光CT重构质量的影响,选择了信噪比高、重建速度快的MLEM算法。测试样品的实验结果进一步证实了该算法的准确性和可靠性。3.自主设计搭建了基于单毛细管聚焦的同步辐射全场纳米成像系统,完成了初步测试。实现了基于波前整形装置的全场纳米成像,分辨率达100nm,成像视场为50μm。
[Abstract]:Capillary special processing by X ray in the reflection characteristics of the wall material and the air interface, the regulation of X by X ray ray propagation direction change, so as to realize the focusing and collimation of X rays. The capillary can achieve broadband transmission and wide angle X ray (360 degrees) transmission, simple structure and low cost. The transmission efficiency is high (generally above 90%). According to the number of channels in the light of different, can be divided into single capillary capillary and capillary. Single capillary with small focal spot, high gain, small size and so on. And the capillary is hollow glass fiber is six square shape cross section of the tube by a cluster of closely spaced components the capillary array. It receives large, X ray utilization rate is high, but the spot is larger. Therefore, the capillary focusing on synchrotron radiation X ray, a widely used focusing and imaging X ray tube in this paper. Study on capillary focusing properties and its application in X ray fluorescence imaging and nano imaging. The paper is based on the Shanghai synchrotron radiation laboratory and X ray source, completed the following research: 1. systematically studies the characteristics of the single capillary, focusing polycapillary, given different capillary focal depth, focal spot the scale and its influence on the fluorescence imaging and the nano imaging.2. is built based on synchrotron radiation X ray fluorescence imaging system based on single capillary focusing and laboratory source X ray fluorescence imaging system for multi capillary focusing, the fluorescence imaging on iodine solution test samples, CT fluorescence imaging. The effects of different algorithms on laboratory source fluorescent CT reconstruction quality, choose the high signal-to-noise ratio, MLEM algorithm for fast reconstruction. The test samples of the experimental results further confirmed The accuracy and reliability of the algorithm is achieved by.3.. A self-adaptive design of synchrotron radiation full field nano imaging system based on single capillary focusing is completed. Preliminary tests are completed. The full field nano imaging based on wavefront shaping device is achieved, the resolution is 100nm, and the field of view is 50 m..

【学位授予单位】：中国科学院研究生院(上海应用物理研究所)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O434.1

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