Double Annular Aperture Type Catadioptric System

Kyung Hee Hong; Seung Yu Rah

doi:10.1117/12.967400

1 January 1987 Double Annular Aperture Type Catadioptric System

Kyung Hee Hong, Seung Yu Rah

Proceedings Volume 0813, Optics and the Information Age; (1987) https://doi.org/10.1117/12.967400
Event: 14th Congress of the International Commission for Optics, 1987, Quebec, Canada

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.

Citation Download Citation

Kyung Hee Hong and Seung Yu Rah "Double Annular Aperture Type Catadioptric System", Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); https://doi.org/10.1117/12.967400

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KEYWORDS

Modulation transfer functions

Combined lens-mirror systems

Modulation

Spatial frequencies

Diffraction

Spatial filters

Physics

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