Granero Luis, Micó Vicente, Zalevsky Zeev, García Javier
AIDO-Technological Institute of Optics, Color and Imaging, Nicolás Copérnico 7, 46980, Paterna, Spain.
Appl Opt. 2010 Feb 10;49(5):845-57. doi: 10.1364/AO.49.000845.
The resolving power of an imaging system in digital lensless Fourier holographic configuration is mainly limited by the numerical aperture of the experimental setup that is defined by both the restricted CCD size and the presence of a beam splitter cube in front of the CCD. We present a method capable of improving the resolution in such a system configuration based on synthetic aperture (SA) generation by using time-multiplexing tilted illumination onto the input object. Moreover, a priori knowledge about the imaged object allows customized SA shaping by the addition of elementary apertures only in the directions of interest. Experimental results are provided, showing agreement with theoretical predictions and demonstrating a resolution limit corresponding with a synthetic numerical aperture value of 0.45.
数字无透镜傅里叶全息配置成像系统的分辨能力主要受实验装置的数值孔径限制，该数值孔径由受限的电荷耦合器件（CCD）尺寸以及CCD前方分束器立方体的存在所定义。我们提出了一种方法，该方法能够通过对输入物体使用时分复用倾斜照明来生成合成孔径（SA），从而提高这种系统配置下的分辨率。此外，关于成像物体的先验知识允许仅在感兴趣的方向上通过添加基本孔径来定制SA形状。文中给出了实验结果，结果与理论预测相符，并证明了与合成数值孔径值0.45相对应的分辨率极限。
