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Imaging performance of annular apertures. II - Line spread functionsLine images formed by aberration-free optical systems with annular apertures are investigated in the whole range of central obstruction ratios. Annular apertures form lines images with central and side line groups. The number of lines in each line group is given by the ratio of the outer diameter of the annular aperture divided by the width of the annulus. The theoretical energy fraction of 0.889 in the central line of the image formed by an unobstructed aperture increases for centrally obstructed apertures to 0.932 for the central line group. Energy fractions for the central and side line groups are practically constant for all obstruction ratios and for each line group. The illumination of rectangular secondary apertures of various length/width ratios by apertures of various obstruction ratios is discussed.
Document ID
19780046754
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tschunko, H. F. A.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1978
Publication Information
Publication: Applied Optics
Volume: 17
Subject Category
Optics
Accession Number
78A30663
Distribution Limits
Public
Copyright
Other

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