Apodization in numerical holography
作者:
D. B. Kramer,
D. K. Anand,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1974)
卷期:
Volume 56,
issue 5
页码: 1545-1550
ISSN:0001-4966
年代: 1974
DOI:10.1121/1.1903477
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Apodization, a process in which the energy in a diffraction pattern is redistributed among the main lobes and the side lobes, has proved its usefulness in optical imaging systems and in linear sonar arrays. It can also make the numerical reconstruction of holograms more adaptable to varying requirements. To demonstrate, the hologram of a rectangular slot is first reconstructed numerically in the conventional manner. It is then reconstructed after apodizing the diffraction pattern contained in the hologram. One type of apodization led to a reconstructed image that accentuated the discontinuity at the edge of the slot. Another type gave an image with a concentration of energy at the center of the object, thus minimizing interference from nearby objects. It is expected that the method can be extended to other objects by expressing them as summations of rectangular slots.
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