单色CCD记录多波长数字全息图及再现像彩色显示

Multi-wavelength Digital Holography Recorded by Monochromatic CCD and Color Reconstructed Image Display

对多波长数字全息图的记录和再现像的彩色显示问题进行了研究.从菲涅耳近似算法出发,对在记录距离一定情况下,不同波长全息图数字再现像的像元所表示的几何尺寸会因波长不同而不同,从而导致各波长再现像无法重合的情况进行了讨论.通过理论分析,讨论了不同波长全息图像素数与再现像像元之间的关系、不同波长全息图记录距离与再现像像元之间的关系,据此得出的解决不同波长再现像重合问题的方法及其对再现像的影响和适用范围等问题;并对合成再现像中原始色彩信息改变及其解决办法进行了分析.通过无透镜傅里叶变换数字全息方法,以632 .8 nm和532 .0 nm两种波长的激光为光源,用单色CCD进行记录,验证了方法的可行性.

Recording and color reconstructed image display in multi-wavelength digital holography are demonstrated. From the Fresenel approximation,the question that the geometric width of the pixel in each reconstructed image recorded with different wavelength in fixed recording distance was different is presented,which result in reconstructed images could not be perfectly superimposed. And then, through theoretical analysis, the relationship between different wavelength hologram pixel and reconstruction pixel, the relationship between different recording distance and reconstruction.pixel, the way that how to get perfectly superimposed image, and their effects onto reconstructed image and applicability are discussed. At same time,the phenomenon and its solution of formal color information changing in composite image are analyzed. At last, with lensless Fourier transform digital holographies, the feasibility of these methods is proved by using two different laser lines,632.8 nm and 532.0 nm,and monochromatic CCD.