反射式凹面圓錐型成像面複合全像術之特性分析

廖展慶(Jan-ching Liao)

指導教授 ： 鄭益祥

國立中央大學/理學院/光電科學與工程學系/碩士(2015年)

摘要

2013年蘇育緯學長提出「影像前浮式之反射式成像面圓錐型複合全像術」，在水平維度與垂直維度的繞射光皆聚焦至觀測點上，觀賞者會看到前浮在圓錐上方近其對稱軸的三維立體實像。
　　在本論文中，首先為了修正全像片彎曲所造成的「像散效應」，在參光系統加入圓柱透鏡，並且對應不同的圓錐半徑，將圓柱透鏡旋轉至特定角度。接著，在同樣的觀測距離，分析不同水平維度繞射光聚焦距離對於影像的影響。利用電腦模擬光線追跡，分析不同水平維度繞射光聚焦距離的情況，對人眼在空間中所看到的影像的影響，包含影像上各像點所觀看到的全像片張數與波長及其頻帶變化，並且改變不同觀賞位置，比較重建影像的寬度、高度與厚度的變化。過程中使用影像回推的方式求得原始待記錄之二維影像資訊，藉以修正全像片彎曲所造成的影像形變。最後使用線形的光源改善由於反射式全像片具有高度的波長選擇性所造成之觀賞視窗過於狹小的問題。

關鍵字

反射式凹面圓錐型 ； 成像面 ； 複合全像術 ； 特性分析

並列摘要

“Reflection-type image-plane concave conical multiplex holographyˮ was proposed by Y. W. Su in 2013. Both in the horizontal and in the vertical dimensions the reconstructed image wave is focused onto the designated observation point for each individed image-plane hologram. The observers around the hologram can perceive a 3D real-image near the symmetry axis of the hologram cone during reconstruction.
　　In this study, first of all, in order to amend for the “astigmatic effectˮ, which is caused by bending the hologram, we should place a cylindrical lens in the reference beam, and for different radius of hologram cone, we should rotate the axis of the cylindrical lens to specific angle. Secondly, we analyze images under the influence of different horizontal focal point for the image wave which is observed at the same observation distance. By using the computer simulation to trace all the relevant rays and compare the variation of the hologram numbers and the observed wavelength of the image points corresponding to different horizontal focal point, we can find out the change of the width-to-height ratio of the reconstructed image under different observation distances. We use the method of image simulation to amend the deformation caused by hologram bending. Finally, in order to increase the dimension of the vertical viewing window, we use a white-light source with a line filament to reconstruct the hologram.

參考文獻

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