同軸式全像術用於三維取像之研究

全像是目前已知唯一能用傳統光強度紀錄媒體，以2D平面式紀錄並重現光波的強度與相位，而形成3D成像之技術。所以，全像成像的技術將是最有效率的方法來執行三維複雜物體的斷層掃描成像。傳統的全像記錄在底片上，造成應用上的不便性。近年來，結合數位偵測器的數位全像顯微3D成像相關技術與應用如雨後春筍般迅速發展，將帶來許多干涉檢測之前瞻性應用。本文中，我們探討利用全像同調干涉技術，來進行三維物體的微米級橫截面成像與3D光學造影之可行性。利用我們自行設計與架設的數位同軸式全像斷層成像系統，我們成功展示三維物體光場的紀錄，再經由程式計算，可數位重現不同景深位置的影像，達到斷層掃描的目的，橫向解析度可達約35μm。應用相同的系統，我們也探討展示全像共軛畸變復原成像的研究。

關鍵字

全像術；數位全像紀錄；繞射；三維成像；二維偵測器陣列

並列摘要

In physics, the hologram is the only known flat 2D recording media that can retrieve 3D object with depth clue. Thus, it will be very useful for reducing the time-consuming to obtain the tomographic structure of a 3D object by using holographic imaging. The conventional holograms are fixed in optical films, so they can't be manipulated, rendering them useless for interactive technical purposes. Replacing the film with the high resolution charge coupled device (CCD), holographic recording and reconstruction could be realized by digital technique. It then brings a great number of important and practical applications. In this paper, we demonstrate a digital holographic coherent tomographic system using a He-Ne laser. The wave fields from the resolution chart images located at different depths can be recorded by a CCD simultaneously and numerically reconstructed by computer program. The lateral resolution of the reconstructed image can reach to 35μ m. We also demonstrate 3D holographic imaging through a thin turbid medium.

並列關鍵字

Holography ； digital recording ； diffraction ； 3D imaging ； CCD camera

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