Results 11 to 20 of about 70,563 (294)
Mirrors with regular hexagonal segments [PDF]
Applied Optics, 2003 The point-spread function and emissivity are calculated for a mirror made from regular hexagonal segments of just a few different sizes. A mirror of this type has many similar segments, which is an advantage for manufacturing, and for an approximately f/1 mirror with > or = 1000 segments and > or = 4 sizes of regular hexagons the increase in ...
Dario, Amodei, Stephen, Padin
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A Novel Axial Foldable Mechanism for a Segmented Primary Mirror of Space Telescope [PDF]
Journal of Astronomy and Space Sciences, 2015 Future space missions will have larger telescopes in order to look deeper into space while improvising on spatial resolution. The primary mirrors for these telescopes will be so large that using a monolithic mirror will be nearly impossible because of ...
Dignesh Thesiya +2 more
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Design of freeform mirrors using the concentric rings method
Heliyon, 2023 Through the methodology of optical surface design based on concentric rings, this paper proposes the design of freeform mirrors, initially by employing segmented rings, each of them with different spherical radii of curvature, and then by employing ...
Jorge González-García +2 more
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Digital Holographic Positioning Sensor for a Small Deployable Space Telescope
Applied Sciences, 2022 We propose a system and a technique to measure misalignments of individual optical elements in a deployable telescope for a small satellite, and we demonstrate its application for a 2230 mm F10.3 Ritchey–Chretien type telescope.
Eduard R. Muslimov +5 more
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Applied Sciences, 2020 Due to fabrication difficulties, separately-polished segmented mirrors cannot meet the co-phasing surface shape error requirements in the segmented telescope system.
Songhang Wu +4 more
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Structure of distributed control system in Seimei telescope
SICE Journal of Control, Measurement, and System Integration, 2021 A segmented mirror control system is indispensable for operating an astronomical telescope which is equipped with a segmented primary mirror. In this study, we focus on the distributed control system (DCS) proposed for Seimei telescope.
Ichiro Jikuya +4 more
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Coarse Phasing Detection Using Multiwavelength Wavefront
Photonics, 2023 Presently, the segmented mirror is the mainstream development direction of large-aperture telescopes. The key problem affecting the performance of segmented mirror telescopes concerns the co-phase of the segments. The segments’ co-phase includes the fine
Rongjie Qin, Zihao Yin, Yinnian Liu
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An Image-Based Alignment Errors Correction Method for Segmented Fresnel Primary Mirror
IEEE Photonics Journal, 2020 The alignment errors correction of segmented Fresnel primary mirror in multiple imaging scenes is simulated. Based on the linear relationship between five kinds of alignment errors and modulation transfer function metric or image frequency domain metric,
Licheng Zhu +5 more
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A Tip–Tilt and Piston Detection Approach for Segmented Telescopes
Photonics, 2020 Accurate segmented mirror wavefront sensing and control is essential for next-generation large aperture telescope system design. In this paper, a direct tip–tilt and piston error detection technique based on model-based phase retrieval with multiple ...
Shun Qin, Wai Kin Chan
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An Annulus-Sector Segmented Primary Mirror
IEEE Photonics Journal, 2017 Ultrahigh resolution optical imaging with large aperture is increasingly desired in space-based remote sensing and imaging system, but it is usually limited by volume and mass constraints of launch vehicle due to size and weight of the imaging system. In
X. X. Wei, X. J. Wan, B. Yang
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