定量相位恢复

G. Barbastathis
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引用次数: 0

摘要

准透明三维物体的内部结构成像是光学系统最具挑战性的任务之一。如果光在体积物体中以相干方式传播,则需要从不同角度收集相位投影并进行层析重建。然而,如果物体足够稀疏,高空间带宽产品相机的单次拍摄通常足以产生3D信息。对于非相干的三维源或散射体,传播场的相互强度具有足够的自由度来重建源,但受干涉测量的灵敏度(对比度)的限制。我们描述了两种互补的相位恢复方法。(1)对于相干稀疏情况,通常会导致出口瞳孔处的快速相位振荡,我们已经实现了几代数字全息成像系统,可以部署在水下成像,例如水生生物,种子颗粒或流动中的气泡。(2)对于缓慢变化的光密度剖面,我们一直在通过强度输运方程(TIE)研究相位恢复,并开发了利用(已知的)物体色散来提高对比度和消除固有扫描要求的方法。我们将给出实验结果并对这些方法进行比较讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantitative phase retrieval
Imaging the internal structure of quasi-transparent three-dimensional (3D) objects is one of the most challenging tasks for optical systems. If the light propagates coherently through the volumetric object, then collection of phase projections from different angles and tomographic reconstruction are required. However, a single shot from a high space-bandwidth-product camera is often sufficient to yield 3D information if the object is sufficiently sparse. For incoherent 3D sources or scatterers, the mutual intensity of the propagated field has sufficient degrees of freedom to reconstruct the source but it is limited by the sensitivity (contrast) of the interferometric measurement. We describe two complementary methods of phase recovery. (1) For the coherent sparse case, which typically leads to rapid phase oscillations at the exit pupil, we have implemented several generations of digital holographic imaging systems which can be deployed underwater to image, e.g. aquatic organisms, seed particles, or bubbles in a flow. (2) For slowly varying optical density profiles, we have been investigating phase recovery via the Transport of Intensity Equation (TIE) and we have developed methods to improve contrast and eliminate the inherent scanning requirement by exploiting the (known) object dispersion. We will present experimental results and discuss these methods comparatively.
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