本科毕业设计（论文）
题目计算机制全息图
学生姓名张攀学号**********
教学院系理学院
专业年级应用物理学2009级
指导教师段茜职称讲师
单位西南石油大学理学院
辅导教师职称
单位
完成日期2013 年 6 月10 日
Southwest Petroleum University
Undergraduate Graduation Design(Thesis)
Title Computer Generated Hologram
Name Zhang Pan No. 0917030140 Department College of Science
Major & rade Application physical level of 2009 Tutor Duan Xi Title Lecturer Unit College of Science SWPU Advisor Title
Unit
Completion Time2013/6/10
摘要
全息照相技术是一种迅速发展起来得成像新技术，它在理论与实践中取得了很大成绩，不仅得到了光学领域还有其他领域的广泛关注。全息术包括波面的记录和波前的再现两个主要步骤。再现原始物应用的是白光或者单色光照射于波面记录在记录介质上的全息图。根据在全息术中使用的可见光波、微波、声波和射频波，我们把制作的全息图依次叫做光学全息图、无线电全息图和声全息图。经典的物理方法对全息显示的记录介质的分辨率及记录装置的灵敏度要求都非常高；而且由于记录和重现是两个独立的过程，只能显示静止的图像，无法动态、实时的显示。计算机技术和微电子技术迅猛发展为全息显示带来了新的希望，高分辨率的空间光调制器以及数字投影装置的发展为全息显示技术的研究提供了新的工具。计算机制全息图是制作全息图的一种新技术，它是利用数字计算机来制作的全息图，它不需要物体的实际存在，而是把物波的数学描述输入计算机处理后，控制绘图仪输出或显示器显示二制成的全息图。计算机全息图的数字再现是利用计算机模拟光学全息的光路，仿真菲涅尔衍射、透镜傅里叶变换等光学过程从而在虚拟的观察屏上得到全息再现像。本文是利用MATLAB语言制作了一个迂回位相编码的傅里叶变换全息图，在MATLAB中使用傅里叶逆变换获得全息再现像显示在屏幕上。
关键词：计算全息；抽样定理；MATLAB；迂回位相效应；罗曼III型编码；数字再现
Abstract
Holography , a new imaging technology ,is developing with rapid speed. It has been made such great promotions in theory and practice that receives wide spread attentions from optics field and other fields. Holography involves in two main steps—— the record of wave surface the reconstruction of wave front. Through the application of the hologram , which is formed by white light or monochromatic light that irradiates on the wave surface to make records on the recording media, one can reconstruct the former object. According to the use of Visible light wave, microwave ,sound wave and radio frequency wave in Holography, people can call these holograms as optical hologram, wireless hologram, acoustical hologram. High degree of recording media's resolution and the record device's dexterity are required in classic physical method. Recording and reconstruction are self-consistent processes, so it can only display in static image rather than dynamic and real-time image. The rapid development of computer technology and microelectronics brings new hopes to the holographic display, as well as the forward of high-resolution spatial light modulator and digital projection device that offer new instruments to the research of holographic display technology. Computer generated holograms, as a new skill, makes full use of digital computer to make holograms. It's not necessary to substantial existence of a object but input the mathematical description of material wave into computer , after some treatments ,one will get the hologram in binary number through a graphic plotter or a display . The digital reconstruction of computer generated holograms is a process which simulate optical path of optical holography , Fresnel Diffraction and Fourier Transform of lens to get a holographic reconstructed image on a virtual viewing screen.
Keywords: CGH; sampling theorem; MATLAB; detour phase-effect; Lohmann type III coding; digital reproduction
