X射线荧光全息术中消除光源偏振效应和孪生像的重构新算法  

A new reconstructing algorithm for removing polarization effect of incident X-ray source and twin images in X-ray fluorescence holography

作　　者：谢红兰[1] 胡雯[1] 罗红心[1] 杜国浩[1] 邓彪[1] 陈荣昌[1] 薛艳玲[1] 师绍猛[1] 肖体乔[1] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800

出　　处：《物理学报》2008年第11期7044-7051,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10505028)资助的课题~~

摘　　要：以27个铁原子成立方排列的晶体结构为模型,通过数值模拟和重构,讨论了入射光源的偏振性对原子像的影响.结果表明,入射光源的偏振性对原子像的可观测性有非常重要的影响.为此,提出了一种能同时消除光源偏振性影响和全息成像所固有的孪生像的数字重构新算法,并通过数字模拟及重构,结果证明了这是一种有效的数字重构算法,能够解决实验过程中光源偏振性和孪生像对原子像的影响.This paper discusses the influence of the polarization of incident X-vay on the reconstructed atomic image by numerical simulation and reconstruction,using a crystalstructure composed of 27 Fe atoms arranged in a cubic lattice as the model.Calculated results show that the choice of polarization is crucial for the atom observability.This paper proposes a new reconstructing algorithm which can eliminate the polarization effect of incident X-ray source and twin images inherent to holography at the same time.Numerical simulation and reconstruction results show that the reconstructing algorithm is effective and can be used to eliminate the influence of polarization of incident light source and twin image in experiments.

关 键 词：X射线荧光全息术 同步辐射 偏振性 

分 类 号：O438.1[机械工程—光学工程]