&lt;title&gt;Image quality assessment of sparse-aperture designs with decreasing fill factors&lt;/title&gt;

Fiete, Robert D.; Mooney, James A.; Tantalo, Theodore A.; Calus, Jason R.

doi:10.1117/12.405805

Cited by 5 publications

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“…The mid-band regions of its MTF are below than that of single aperture system. Because of this problem, new criterions [6] were developed, such as the efficiency factor and quality factor.…”

Section: Otf Criterionmentioning

confidence: 99%

Image evaluation for optical synthetic aperture imaging system

et al. 2005

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In this paper, the theory of optical synthetic aperture imaging system is described, with emphasis on the image evaluation by the Point Spread Function (PSF) and Optical Transfer Function (OTF). The optical synthetic aperture imaging technique achieves higher resolution at the cost of decreasing of Modulation Transfer Function (MTF) in near mid-band regions, and of increasing the sidelobes of the PSF. The image evaluation methods for optical synthetic aperture imaging system are given, such as two-point resolution criterion and MTF. The disadvantage of evaluation methods is analyzed by Rayleigh criterion, Sparrow criterion and threshold criterion. The conclusion is that the imaging quality of synthetic aperture system is no better than that of the single sub-aperture system when the sidelobe is 0.5 times of the central lobe of the PSF. Finally，we propose new evaluation criterions, such as the efficiency factor and quality factor, which are directly linked to MTF.

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Section: Otf Criterionmentioning

confidence: 99%

Image evaluation for optical synthetic aperture imaging system

et al. 2005

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Diffraction-limited performance and aberration tolerance of a sparse optical synthetic aperture imaging system with four sub-apertures

Wang

Rao

Jiang

2008

Journal of Modern Optics

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Concepts for a Large‐Aperture, High Dynamic Range Telescope

Kuhn¹,

Moretto²,

Racine³

et al. 2001

PUBL ASTRON SOC PAC

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This paper summarizes concept studies for a large telescope capable of wide-field imaging and of the highest possible dynamic range for photometry and angular resolution.Point-spread functions (PSFs) and scattered light levels at large offsets are computed and compared for four telescopes of the same light-gathering power but with different pupil functions:1. a reference monolithic mirror telescope with a 17.4 m primary, 2. a segmented mirror telescope (SMT) with a hexagonally segmented primary, 3. a hexagonal off-axis telescope (HOT) with a distributed aperture made of m unobstructed circular 6 # 6.5 mirrors that are identical off-axis sections of a parent 20 m mirror, and 4. a square off-axis telescope (SOT) whose aperture is made of m off-axis mirrors. 4 # 8The characteristics of the PSFs are examined in the diffraction-and seeing-limited regimes, assuming (1) perfect mirror figure and (2) realistic figure errors (edge defects). The implications of field rotation with an altitude-azimuth mounting are discussed in each case. The implementation of adaptive optics (AO) and the properties of AO-compensated PSFs having a Strehl ratio of 0.5, and of coronagraphic imaging, are also discussed for the four configurations. It is shown that, in the seeing-limited regime and as intuitively expected, the optical performance of all four telescopes is comparable. With higher order adaptive optics and for coronagraphic observations, the SOT and HOT are superior to the SMT. This distinction becomes larger with relaxed constraints on mirror edge-polishing requirements. A full optical design is presented for the novel HOT configuration, and optical fabrication issues are briefly addressed. Finally, science programs and possible instrumentation layouts with the HOT are briefly explored for different modes of operation. It appears that the natural "optical bench" configuration of the HOT can provide a remarkably versatile and convenient environment for instrument deployment.

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<title>Image quality assessment of sparse-aperture designs with decreasing fill factors</title>

Cited by 5 publications

References 0 publications

Image evaluation for optical synthetic aperture imaging system

Image evaluation for optical synthetic aperture imaging system

Diffraction-limited performance and aberration tolerance of a sparse optical synthetic aperture imaging system with four sub-apertures

Concepts for a Large‐Aperture, High Dynamic Range Telescope

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