基于液晶空间光调制器的相息图扫描三维成像

本文提出了一种利用纯相位型液晶空间光调制器(LC-SLM)实现相息图三维显示的方法.该方法以LC-SLM为显示器件,通过相息图的衍射进行三维像的重构.详细研究了相息图的计算及其与LC-SLM参数间的关系,并对再现像像质进行了讨论.为提高显示的空问分辨率,采用分时复用技术,对三维物体进行分组取样,并计算每一分组的相息图,形成分组相息图序列,再现时依次将相息图输入到LC-SLM,利用人眼的视觉残留效应以达到连续扫描三维成像的目的.实验结果表明,该方法实现了三维物体的再现,为三维显示提供了一种有效的方法.

Scanning Three-dimensional Image with Kinoform Based on Liquid Crystal Spatial Light Modulation

An effective method for three-dimensional(3D)imaging with kinoform based on reflective phase-only Liquid Crystal Spatial Light Modulator(LC-SLM)was proposed.3D image actually was reconstructed by the diffraction of kinoform using LC-SLM as a display unit.The calculation of kinoform,the relationships between parameters of LC-SLM with the kinoform,and some influencing factors in the quality of the reconstructed image were discussed in detail.In order to enhance the displaying resolution,a displayed object was decomposed into several sampling groups,and the corresponding kinoforms were calculated.When the kinoforms were inputted into LC-SLM successively within residual time of human eyes,the diffraction light wave may reconstruct the image of the original object,and then an observer can see a 3D image in free space.Experimental results demonstrate the correctness of the proposed approach,which provides an effective way for 3D display in practical application.