單步驟反射式成像面圓錐型複合全像術;One-step reflection image-plane conical multiplex holography

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/57763

Title:	單步驟反射式成像面圓錐型複合全像術;One-step reflection image-plane conical multiplex holography
Authors:	郭博裕;Kuo,Po-yu
Contributors:	光電科學與工程學系
Keywords:	反射式全像術;圓錐型;複合全像術;單步驟;虛像;conical type;multiplex holography;one-step;reflection hologram;Virtual image
Date:	2012-09-29
Issue Date:	2012-11-12 14:29:53 (UTC+8)
Publisher:	國立中央大學
Abstract:	複合全像術發展至今已有四十多年的歷史，優點在於拍攝全像片的原始物體，不需被限制能擺放在光學桌上。若拍攝的全像片為軸對稱型式，觀察者可觀賞到原始物體各個角度的重建影像，因此可以展示物體360度的影像資訊。其中圓錐型複合全像術是於1989年由Okada領導的日本研究團隊所提出，其展示型態為穿透式全像片，將二維物體資訊分別記錄成一條細長型的全像片，因此在重建影像時會有一條條惱人的垂直條紋重疊於影像上，我們稱為「柵欄效應」，可以應用成像面的拍攝技術來消除此效應。　　本論文的重點在於，利用成像面圓錐型複合全像術的概念，在拍攝時的物光及參考光光路中加入圓柱透鏡，改進全像片彎曲成圓錐曲面時所產生的「像散效應」，以增加單一全像片之可觀察影像範圍，經過視線交會後，重建出形變量較小的三維立體影像。由於我們在物光也加入圓柱透鏡，因此在修正像散效應時的自由度會有所增加。全像片拍攝完成後以反射式全像片的重建方法進行重建，觀賞者將會看到沉在圓錐內部的三維立體虛像。我們以電腦模擬全像片拍攝的過程，以及全像片重建後，觀察者在改變觀賞位置時，所看到之立體影像的變化情形。此方法成功地製作出單步驟反射式成像面圓錐型複合全像片且重建出形變量較小的三維影像。然而觀賞視窗會因為底片之波長選擇性而有所限制，另外由於拍攝時重複曝光次數較多，繞射效率較低。最後我們也提出改進的方法以及未來發展的方向。Multiplex holography has been developed for more than forty years. The advantage of Multiplex holography is that the subjects for holographic recording are not limited to be those which could be placed on the optical table. One can observe the reconstructed image of the original object from different directions if the multiplex hologram is made to be axially symmetric.The conical holographic stereogram was developed in 1989 by Japanese research team led by K. Okada. The displaying type of this kind of hologram belongs to the transmission type. They recorded 2D image information belonging to different angles of the original object in a sequence of long, thin and fan-shaped areas of the recording film. Therefore, the reconstructed image will have many black stripes. It looks like viewing an image through a fence, called the “picket-fence effect”. This problem can be amended by using the image-plane technique.　　In this study, we focus on this image-plane concept and design the method to record reflection image-plane conic multiplex hologram in one step. We add cylindrical lenses in both the object beam and the reference beam to compensate for the “astigmatic effect”, produced when hologram is curve into a conical surface. As a result, observer can watch wider range of the single hologram than before. We obtain 3D image with smaller deformation after this compensation process which increases the correcting freedom of “astigmatic effect” by utilization of an extra cylindrical lens in the object beam. The observer can perceive the 3D virtue image generated inside the hologram cone during reconstruction. We use computer to simulate the holographic process and the reconstructed 3D images observed at different positions. Using this fabrication method, we success fully recorded reflection image-plane conic multiplex hologram in one step and reconstructed 3D image with smaller deformation. The disadvantage of this method is the extremely narrow vertical viewing window and the lower diffraction efficiency. Finally, we propose some improved methods and the possible future development.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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