成像面圓盤型複合全像術之虛像影像製作與分析
| Autor: | Zheng-Feng Chen, 陳政鋒 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 ‘‘Image-plane disk-type multiplex holography’’ (IPDTMH) was proposed by Prof. Y. S. Cheng and Dr. C. H. Chen in 2000. The cylindrical lens used in conventional technique was forsaken in their optical system. By using multiplex-exposure method, the picket-fence effect was also successfully eliminated. IPDTMH can be reconstructed using white-light illumination, and 3D image can be displayed for the observer by normal-viewing. In this study, the fabrication method and the parameter design of image-plane disk-type multiplex holography for virtual-image generation are described. With computer simulation, we analyze the holographic model of the disk-type hologram under white-light reconstruction. By the changing values of the hologram number and the wavelength corresponding to the observed image points, we can numerically obtain the width-to-height ratio of the reconstructed image under different observation distances and various vertical viewing angles. We also describe how the position of observation ring belonging to different wavelength moves with holographic parameters. Next, we illustrate the formation of interference fringes appeared on the reconstructed image. These fringes can be viewed at the overlapping area of diffracted light from adjacent holograms and this phenomenon is successfully eliminated by optimized parameters described in this study. Finally, we can fill the dark area of observation ring with diffracted object beam by changing the distance between reference beam and hologram disk in the holographic fabrication process, and thus the picket-fence effect can be eliminated. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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