反射式成像面凹面圓柱型複合全像術;Reflection image-plane alcove cylindrical multiplex holography

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题名:	反射式成像面凹面圓柱型複合全像術;Reflection image-plane alcove cylindrical multiplex holography
作者:	雷鎮遠;Chen-yuan Lei
贡献者:	光電科學研究所
关键词:	複合全像術;圓柱型全像術;反射式全像術;multiplex holography;cylindrical holography;Reflection holography
日期:	2009-06-30
上传时间:	2009-09-22 10:36:11 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	傳統型複合全像片的重建影像是透過許多小全像片所重建的部份影像組合而成，因而產生許多影像像差以及柵欄效應。用成像面形式來製作能夠減少傳統型全像片中的像差與柵欄效應，由於輸入影像所用的LCTV是平面，為了同時達到成像面與凹面圓柱這兩個條件，我們的實驗架構採用四步驟法：首先使用「擴展垂直視角之反射式圓盤型複合全像術」在光學系統中加入毛玻璃的方法來增加反射式全像片的垂直視角，接著，用重複曝光的方式將二維影像拍攝在第二號母片上，再利用變換第二號母片之重建光角度使繞射光彎折成所需的角度，接著，經過多一次翻拍以消除錯誤影像的干擾，最後將所有的二維影像資訊用「聚焦線段中心」位於全像圓柱軸心上的圓柱發散波為參考波，一次翻拍到子片上製作成反射式全像片。此圓柱波在全像片彎折之後，可以視為全像圓柱軸心上的點光源。　　本論文利用繞射理論推算繞射光的方向，藉由電腦模擬計算來分析四個步驟的實驗架構，討論各種參數對重建影像的影響，並探討改良的方法。Conventional multiplex holograms are composed of a series of long-thin individual holograms, resulting in so-called picket-fence effect and aberration on the 3-D image. The image-plane technique in hologram formation alleviates this aberration and picket-fence effect on the reconstructed image. In order to make the image-plane cylinder-type multiplex holograms possible, we adopt the “four-step experimental setup”. In the first step for master hologram fabrication, a diffuser is added into the optical system to increase the vertical viewing window. Then, all the 2D images retrieved from the master hologram are sequentially recorded onto the second master hologram using multiple-exposure procedure. Next, we adopt a collimated wave as the reconstruction reference beam to control the direction of the image wavefront from the second master hologram. In the fourth step, all the 2Dimages are recorded on the transfer hologram using a cylindrical reference wave. After bending the transfer hologram into a cylinder, the source line of cylindrical reference wave for hologram recording is compressed into a point on the axis of our cylindrical hologram. A white-light bulb can then be used as the illuminating light source for image reconstruction. In this thesis, diffraction theory and computer simulation are used to calculate the direction of diffraction beam and to obtain the parameters needed for our experimental setup. The characteristics of the reconstructed 3D images and the methods to improve the quality of images are also discussed.
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