Results 11 to 20 of about 714 (189)
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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Fiber-Connected Wavefront-Sensing System for Large Segmented Space Telescopes
IEEE Photonics Journal, 2023 A metrology system capable of cofocusing and cophasing is essential to ensure the performance of large segmented space telescopes, similar to that of monolithic telescopes, as well as to image the faintest galaxies.
Qi-Chang An +6 more
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Single-wavelength coarse phasing in segmented telescopes [PDF]
Applied Optics, 2015 Space observations of fainter and more distant astronomical objects constantly require telescope primary mirrors with larger sizes. The diameters of monolithic primary mirrors are restricted to 10 m because of manufacturing limitations. For space telescopes, the primary mirrors are limited to less than 5 m due to fairing capacity.
Simar, Juan Felipe +2 more
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Figure control for a fully segmented telescope mirror [PDF]
Applied Optics, 1982 A system is described to control the figure of a large telescope primary mirror that is composed of many individual segments. The geometry considered, employing hexagonal mirrors, allows a simple and economical control system. The system is shown to be reliable and effective in continuously maintaining the figure to the precision required for optical ...
Mast, T.S., Nelson, J.E.
openaire +3 more sources
Simulation of the optical performance of the Fluorescence detector Array of Single-pixel Telescopes [PDF]
EPJ Web of Conferences, 2019 The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a proposed large-area, next-generation experiment for the detection of ultra-high energy cosmic rays via the atmospheric fluorescence technique. The telescope’s large field-of-view (30 ×
Pech Miroslav +18 more
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Towards the experimental validation of a small Time-Projection-Chamber for the quasi-absolute measurement of the fission cross section [PDF]
EPJ Web of Conferences, 2021 To accurately measure neutron-induced fission cross sections, to characterize neutron-beam lines or to make dosimetric investigations, it is necessary to have high accuracy measurements of neutron fluence.
Chatel Carole +5 more
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In-Situ Metrology of Large Segmented Detector Based on Modified Optical Truss
IEEE Photonics Journal, 2023 To precisely map cosmic structures and capture time-domain events, future large survey telescopes will be equipped with segmented detectors that greatly expand their field of view. Segment flatness and assembly accuracy will be essential for them to make
Qichang An +6 more
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Development of a small Time-Projection-Chamber for the quasi-absolute neutron flux measurement [PDF]
EPJ Web of Conferences, 2023 Accurate actinides fission cross sections around 1 MeV are of primary importance for the safety of generation IV reactors. To have accurate measurements, the neutron flux must also be accurately estimated.
Chatel Carole +4 more
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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
doaj +1 more source
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
doaj +1 more source