数字微镜器件在视频全息中的应用

为研究数字微镜器件在视频全息中的应用,探讨了基于数字微镜器件的全息编码方法。基于数字微镜器件的微观物理结构,讨论二维离散微镜像素结构、开态微镜列的闪耀光栅特性和脉宽调制的微镜偏转工作原理。将数字微镜器件分辨力、微镜尺寸、间隔、旋转角度、参考光入射角以及衍射条件等因素结合到计算全息编码中,提出干涉面抽样方法、相位补偿技术和无偏置二元全息编码方法,使产生的计算全息图适应数字微镜器件独特的空间光调制特性和计算视频全息的要求。实验表明,该方法调整了重构物光波的衍射方向,集中了衍射光在重构像中的分布,增加了成像清晰度和光能有效利用率,提高了全息编码效率。

Characterization of a Digital Micromirror Device for Computer Generated Holographic Video

To develop computer generated holographic video(CGHV) technology utilizing the digital micromirror device(DMD),the holographic coding methods have been investigated.Basis on digital micromirror device physical microstructure,two dimensional discrete micromirror pixels,blazed diffraction gratings of rotated mirrors and its pulse width modulation working principle are discussed.The following factors have been considered,namely,digital micromirror device's resolution,mirror size,pitch,rotating angle,incident angles of reference wave and diffracting conditions,etc.In order to match the hologram to the spatial light modulating properties of digital micromirror device and fulfill the requirements of computer generated holographic video,the sampling method on interference plane,phase compensation technique and no-bias binary hologram coding method are put forward.The experimental results show that the methods have adjusted the diffractive direction of object wave,the diffraction energy concentrated on object wave,improved the quality of reconstruction,increased the utilization ratio of diffraction energy,and improved the efficiency of holographic code.