A Quantitative Evaluation of Neutron Penumbral Imaging with a Toroidal-Segment Aperture

Yen-Wei CHEN  Zensho NAKAO  Ikuo NAKAMURA  

IEICE TRANSACTIONS on Electronics   Vol.E80-C   No.2   pp.346-351
Publication Date: 1997/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
penumbral imaging,  neutron image,  toroidal aperture,  point spread function isoplanatic,  non-isoplanaticity,  field of view,  spatial resolution,  

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A quantitative study is made on performance of neutron penumbral imaging with a toroidal-segment aperture, and it focused on isoplanaticity of aperture point spread function and effect of the non-isoplanaticity on the reconstructed images. The results show that the aperture point spread function is satisfactorily isoplanatic for a small field of view, while for a large field of view the point spread function is not satisfactorily isoplanatic resulting in some distortion in the reconstructed image and reduction of resolution.