基于数字全息图记录方法的实验研究

Discussion about the method of recording Digital Hologram

本文从数字全息记录及再现的基本原理出发,设计出了记录硬币,以及立体人像全息图的方法。相比较而言,硬币属于平面物体,能很好的控制其反射的光线,也使得记录其全息图变得相对简单。而诸如人像等三维物体不同于硬币,光照到后会发生散射现象,故反射光线的方向很难控制,且物光很微弱,所以要想记录其全息图是较困难的。经过不断的探索,本文设计出了可以较好的记录人头等三维物体的光路图,并通过数字再现得到了比较满意的效果。最后,提出了一种消除零级衍射的方法,可使图像更加清晰。

According to the principle of recording and reconstructing of the digital holography, a method that records the holography of coin and 3D portrait is designed. Compare between coin and portrait, coin is the plane object, and the reflected my can be controlled easily, and also the holograph of coin can be recorded simply. However, the 3D portrait is a sphere object. When the portrait illuminate by the ray, there will take place phenomena of the dispersion. So orientation of the reflected ray is controlled difficultly, and the my is too dim to be recorded. Afler a lot of experiment j an improved method of recording the holography of 3D portrait is designed. And the image of digital reconstruction is satisfied. At last, a method that can eliminate the zeroorder diffraction is proposed.