X光超瑞利散斑场傅里叶变换关联成像模拟研究  

Simulation Research on X-Ray Fourier-Transform Ghost Imaging Using Super-Rayleigh Speckle Field

作　　者：陈倩 喻虹[1,3] 谈志杰 朱瑞国 韩申生 Chen Qian;Yu Hong;Tan Zhijie;Zhu Ruiguo;Han Shensheng(Key Laboratory for Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou,Zhejiang 310024,China)

机构地区：[1]中国科学院上海光学精密机械研究所量子光学重点实验室,上海201800 [2]中国科学院大学,北京100049 [3]国科大杭州高等研究院,浙江杭州310024

出　　处：《光学学报》2021年第19期256-264,共9页Acta Optica Sinica

基　　金：国家自然科学基金(11627811);国家重点研发计划(2017YFB0503303)。

摘　　要：X光傅里叶变换关联成像有望实现台式纳米显微系统,但在实际应用中受限于较低的光通量和成像信噪比,重构图像质量不佳。为解决这一问题,针对X光调制屏的二元特性,研究了基于X光超瑞利散斑场的傅里叶变换关联成像技术,并理论推导了二元调制屏调制散斑场,提出将散斑场对比度以及局部对比度之差作为目标函数,用带精英策略的非支配排序遗传算法优化设计二元调制屏。数值仿真结果表明,该方法可以得到高对比度的X光超瑞利散斑场,利用X光超瑞利散斑场可实现傅里叶变换关联成像,提高图像可见度,在低信噪比条件下提高图像质量。X-ray Fourier-transform ghost imaging has the potential to achieve tabletop nanoscale microscopy. However, due to the limited luminous flux in practical applications, the imaging signal-to-noise ratio is low, which leads to poor image quality. In light of the binary characteristics of the X-ray modulating screen, this paper studies the X-ray Fourier-transform ghost imaging using a super-Rayleigh speckle field to solve the above problem. The theoretical derivation of the X-ray speckle field generated by the binary modulation screen is first carried out. Then, with the speckle contrast and the difference of local contrast as objective functions, the non-dominated sorting genetic algorithm with elite strategy is adopted to optimize the design of the binary modulation screen. Numerical simulation results show that the proposed method can obtain high-contrast X-ray super-Rayleigh speckle fields, with which the Fourier-transform ghost imaging can be realized. As a result, the image visibility can be enhanced, and the image quality can be improved especially at a low signal-to-noise ratio.

关 键 词：X射线光学 X光关联成像 超瑞利散斑场 带精英策略的非支配排序遗传算法 

分 类 号：O434.19[机械工程—光学工程]