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Proceedings Paper

Double Annular Aperture Type Catadioptric System
Author(s): Kyung Hee Hong; Seung Yu Rah
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Paper Abstract

Previous researches(1)(2)disclosed two aperture modulation effects - a spatial frequency filtering effect and an aberration campansation effect. The spatial frequency filtering effect was found when aperture modulation was used with an aberration free system, and aberration compansation effect when aperture modulation was used with the large aberrations. The filtering effect was found by computing theoretical MTF, and compansation effect by computing the MTF from design data. Another important discovery was that the MTF could be improved by proper aperture modulation(3)(4). This discovery was made by measuring the MTF of a binocular objective experimentally. In this work, a double annular aperture type catadioptric system (DAA), which would have those two modulation effects, was designed to be sure the possibility of its practical use. The DAA system is composed of an outer annular aperture type catadioptric system and an inner small circular full aperture type refracting system. The ray aberration and MTF were compared those of a full aperture type refracting system and an annular aperture type catadioptric system. In this comparison, the effective f-number and the focal lengths of the three systems were the same.

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967400
Show Author Affiliations
Kyung Hee Hong, Korea Military Academy (Korea)
Seung Yu Rah, Korea Advanced Institute of Science and Technology (Korea)


Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age

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