基于博奇编码离轴全息方法的研究  

Off-axis holography based on Burch coding

作　　者：陈林[1] 许忠保[1,2] 邬文俊[1,2] 周胜飞 王心怡[1] 

机构地区：[1]湖北工业大学机械工程学院,湖北武汉430068 [2]湖北省现代制造质量工程重点实验室,湖北武汉430068

出　　处：《应用光学》2014年第6期1003-1008,共6页Journal of Applied Optics

基　　金：国家自然科学基金资助项目(61077086);湖北省重点自然科学基金资助项目(2011CDA007)

摘　　要：研究了一种计算全息编码过程中使原始像与共轭像分离的方法。通过对傅里叶变换计算全息图再现过程的分析,采用将原物抽样点镶嵌到比原物大的全零矩阵中的方法代替载频参数的计算,来实现原始像与共轭像的分离。对新矩阵进行离散傅里叶变换,利用博奇编码方式制作出计算全息图,并在图像重构时利用高通滤波器消除背景光干扰对重构视觉效果的影响。采用该方法制作的计算全息图可通过控制全零矩阵的大小来控制再现时原始像与共轭像的分离程度,全零矩阵越大,其分离程度越大。实验结果表明,全零矩阵为原物大小的4倍时可使原始像与共轭像刚好分离。但是为了方便滤除零级光斑,全零矩阵需稍大于原物大小的4倍。A method for separating the original image and the conjugate image in the reconstruc‐tion of Fourier computer generated hologram (CGH) was studied .According to the analysis on the process of CG H reconstruction by Fourier transform ,the method w hich put the original sam‐pling points into a larger null matrix w as used to separate the original image and conjugate image . After the fast Fourier transform with the new matrix ,CGH was obtained by Burch coding ,then a high pass filter was used to eliminate the influences of interference of background light on the visu‐al impression w hen image w as reconstructed . T he degree of separation of the original image and the conjugate image of CGH produced by this method can be controlled with the size of the null matrix ,the larger the null matrix ,the greater the degree of separation .The experimental results show that the original image and conjugate image of CG H can separate w hen the null matrix is 4 times of the original size .But in order to filter the zero order light spot easily ,the null matrix should be more than 4 times of the original size slightly .

关 键 词：计算全息 傅里叶变换 博奇编码 离轴 

分 类 号：O438[机械工程—光学工程]