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Tilted illumination in-line holographic velocimetry: Improvements in the axial spatial resolution
Optics and Lasers in Engineering ( IF 4.6 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.optlaseng.2020.106280
Julia Lobera , Virginia Palero , Eva Roche , Marina Gómez Climente , Ana M. López Torres , Nieves Andrés , M. Pilar Arroyo

Abstract Two are the main limitations of in-line holography: the twin image problem and the poor spatial resolution in the optical axis direction. The twin image problem can be solved with the introduction of an imaging lens and a knife-edge aperture located at its focal plane. In this work, a theoretical analysis of the axial resolution with and without aperture is provided from the perspective of the Optical Diffraction Tomography. Theoretical analysis and controlled experiments with the different recording options, demonstrate that a small tilt of the illumination beam, together with a centered rectangular aperture, is a key parameter as it improves the spatial resolution along the optical axis during the location and tracking of a particle field.

中文翻译:

倾斜照明在线全息测速:轴向空间分辨率的改进

摘要 在线全息术的主要局限性有两个:孪生图像问题和光轴方向的空间分辨率差。双像问题可以通过引入成像镜头和位于其焦平面的刀口光圈来解决。在这项工作中,从光学衍射断层扫描的角度提供了有和没有孔径的轴向分辨率的理论分析。具有不同记录选项的理论分析和受控实验表明,照明光束的小倾斜以及居中的矩形孔径是一个关键参数,因为它可以在定位和跟踪粒子期间提高沿光轴的空间分辨率场地。
更新日期:2020-11-01
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