位相恢复算法在量子关联衍射成像中的应用研究
文献类型：学位论文
| 作者 | 刘永峰 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 魏青 |
| 关键词 | 量子信息 量子关联衍射成像 位相恢复算法 图像滤波 |
| 其他题名 | Application of Phase Retrieval Algorithm to Quantum Correlated Diffraction Imaging |
| 中文摘要 | 基于量子纠缠特性实现的量子关联成像（又称鬼成像），作为一种新的非局域成像方式，与传统的光学成像在成像本质及实现方法上都有许多不同之处。利用量子关联衍射成像技术能够得到物体的傅里叶变换强度，并可以实现突破传统光学衍射极限的亚波长干涉，因此非局域量子成像技术成为近年来量子信息领域的一个研究热点，随着研究工作的逐步深入，目前已经利用经典热光源实现了关联衍射成像，使得该技术有望应用在X射线以及中子衍射成像等领域。 位相恢复方法是指根据所探测到的干涉或衍射光强分布来恢复位相信息，这种方法在波前检测、遥感、电子显微、晶体学以及天文学等方面都有重要的作用。本文主要研究了位相恢复算法在量子关联衍射成像中的应用，并将二者有机的结合起来，为该技术向实用化方向发展创造了条件。 本文内容主要包括： 1.介绍了非局域量子成像以及位相恢复算法的发展历程、国内外研究现状、取得的成果以及相关的应用。 2.利用量子关联衍射成像技术，在实验上利用非相干光源，通过统计意义上的强度关联方法，分别得到了纯振幅物体与纯位相物体的无透镜傅里叶变换频谱，为热光源无透镜傅里叶变换理论提供了实验依据。 3.将位相恢复方法应用于量子关联衍射成像，在实验上得到物体傅里叶频谱的基础上，采用误差消除与输入-输出等恢复算法，并结合过采样理论，实现了实验所用物体透过率函数的恢复，分别得到了纯振幅物体的振幅分布函数与纯位相物体的位相分布函数。 4.讨论了实验所得傅里叶频谱的背底和噪声的来源以及对恢复结果的影响，给出了去除不均匀背底的方法，并用不同的滤波方法对频谱进行滤波，比较了滤波结果的优劣。 5.最后讨论了工作的改进方向，进行了简短的总结。 |
| 英文摘要 | As a new non-local imaging method, Quantum correlated imaging (ghost imaging), which is based on entanglement character of quantum state, has many differences with traditional optical imaging in imaging nature and the way to accomplish. Using quantum correlated diffraction imaging technique can obtain the objects’ Fourier transform frequency spectrums, and also can achieve sub-wavelength interference which break through the diffraction limit of traditional optics. So non-local quantum imaging in quantum information field has attracted much attention in recent years, with the research going deeply, quantum correlated diffraction imaging can be accomplished by use of classical thermal source now, which indicates its abroad application in x-ray and neutron diffraction imaging. Phase retrieval algorithm is a method to get phase information from interference or diffraction intensity distribution. It is broadly used in wave front sensing, electron microscopy, remote sensing, crystallography, astronomy and other fields. In this paper, the phase retrieval algorithm used to quantum correlated diffraction imaging has been studied, the combination of the two techniques pave the road of this technique used in real application. The content of thesis can be summarized as follows: 1. Introduce a brief development history and the application of quantum imaging and phase retrieval algorithm. 2. Based on quantum correlated diffraction imaging technique, using incoherent source in experiment, we obtain the Fourier transform frequency spectrums of both amplitude-only object and pure-phase object, which provide experimental evidence for the lensless Fourier Transform theory using thermal light. 3. The transmission functions of objects are successfully retrieved from the Fourier frequency spectrums, which are obtained in experiments. In the retrieval procedure, the error reduction algorithm and the input-output algorithm are used by combining with over sample theory. The amplitude distribution of amplitude-only object and the phase distribution of pure-phase object are retrieved successfully. 4. The influence to the retrieval results caused by the background and the noise in the frequency spectrum obtained is discussed. The methods of how to get rid of the background and the way to filter the noise are also given. 5. Finally, a brief conclusion and the improve direction is presented. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16597]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 刘永峰. 位相恢复算法在量子关联衍射成像中的应用研究[D]. 中国科学院上海光学精密机械研究所. 2007. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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