| 数字再现三维物体菲涅耳计算全息的研究 |
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| 引用本文： | 葛宝臻,罗文国,等.数字再现三维物体菲涅耳计算全息的研究[J].光电子．激光,2002,13(12):1289-1292. |
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| 作者姓名： | 葛宝臻 罗文国 |
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| 作者单位： | 天津大学精仪学院,光电子信息技术科学教育部重点实验室,天津,300072 |
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| 基金项目： | 国家自然科学基金资助项目 (60 0 770 2 8) |
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| 摘 要： | 提出了一种用计算机产生和再现三维物体离轴菲涅尔（Fresnel)全息图的数字方法。采用Born近似法则建立了理想三维的物体模型；利用博奇（Burch)编码方法制作了此三维物体的计算全息图。通过卷积和快速傅立叶变换（FFT）的方法计算衍射积分，以数字聚焦的方法进行再现，通过改变再现距离，获得了三维物体各截面的再现像。直接利用数字滤波技术消除了虚像和零级像，得到了清晰的实像，给出了此三维物体的计算全息图及其不同截面的数字再现结果。
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| 关 键 词： | 三维物体 数字全息 计算机制全息图 菲涅尔全息 快速傅立变换 FFT |
| 文章编号： | 1005-0086(2002)12-1289-04 |
| 修稿时间： | 2002年5月15日 |
The Study of Numerical Reconstruction of Fresnel CGH of a 3-D Object |
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| GE Bao zhen,LUO Wen guo,L U.. Qie ni,ZHAO Hui ying,ZHANG Yi mo.The Study of Numerical Reconstruction of Fresnel CGH of a 3-D Object[J].Journal of Optoelectronics·laser,2002,13(12):1289-1292. |
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| Authors: | GE Bao zhen LUO Wen guo L U Qie ni ZHAO Hui ying ZHANG Yi mo |
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| Abstract: | A numerical method for producing and reconstructing Fresnel off line computer generated hologram(CGH) of a 3 D object is described in this paper.Based on the Born approximation,an ideal 3 D object model is builded.A CGH of the 3 D object is generated through the method of Burch coding.Using convolution and fast Fourier transform(FFT) algorithm to calculate diffraction integral,the CGH is reconstructed by digital focus method.The variety of layers of the 3 D object is reconstructed through using different distances between reconstructed image and CGH.By using digital filter method,twin images and zero order diffraction images are eliminated and clear real images are obtained.The 3 D objects CGH is presented in this paper,together with the results of numerical reconstruction of different sections. |
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| Keywords: | Digital holography Computer Generated Hologram(CGH) Fresnel holography Fast Fourier Transform(FFT) |
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