廣視野高解析度數位全像術及其最佳化系統設計之研究

Abstract

本論文主要探討廣視野的數位全像術系統所會面臨的問題與其解決方法，以達到廣視野高解析度數位全像術系統為目的。一般在廣視野的系統下，其視野範圍主要受限於光感測元件，因此本論文將使用放大倍率小於1的4f系統，來達到突破光感測元件視野範圍之限制，但記錄的光場被縮束之後會遇到像點解析度與橫向解析度不足的問題，因此以紀錄菲涅耳全像片結合升採樣技術，增加其重建平面的畫素數量，提升像點解析度。接著再使用參考球面波紀錄全像片，在重建平面上提供一項額外的放大倍率，並結合合成孔徑拓寬全像片頻譜平面的頻譜涵蓋範圍來增加橫向解析度。而提升像點解析度與橫向解析度後，可以使原本只能解析 線寬提升至 。另外橫向解析度的高低也會與視野範圍的大小有關，因此本研究會探討其最佳化數值使系統元件的效益可以被最大化，以增加未來用於應用層面的潛力。We propose a wide-field digital holographic microscopy system to enhance the field of view. In wide-field system, the field of view is limited in image sensor. So we use telescope to enhance the field of view. To resolve the low pixel resolution, we use up-sampling method in Fresnel transform to enhance the pixel resolution in reconstruction plane. Then, to enhance the lateral resolution, we use spherical reference wave to product the additional magnification in reconstruction plane. And using synthetic aperture to enhance the frequency coverage in frequency plane of the hologram. After enhancing the pixel resolution and lateral resolution, we can get the lateral resolution from becomes . And the lateral resolution is inversely proportional to the field of view, so we would find the optimum value to maximum the effect of the system, which has more potential in application in the future.