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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MID-Radio Telescope, Single Pixel Feed Packages for the Square Kilometer Array: An Overview
IEEE Journal of Microwaves, 2021 The Square Kilometre Array (SKA) project is an international effort to build the world's largest radio telescope, enabling science with unprecedented detail and survey speed.The project spans over a decade and is now at a mature stage, ready to enter the
Alice Pellegrini +12 more
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Towards Piston Fine Tuning of Segmented Mirrors through Reinforcement Learning
Applied Sciences, 2020 Unlike supervised machine learning methods, reinforcement learning allows an entity to learn how to deploy a task from experience rather than labeled data.
Dailos Guerra-Ramos +2 more
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Phasing piston error in segmented telescopes
Optics Express, 2016 To achieve a diffraction-limited imaging, the piston errors between the segments of the segmented primary mirror telescope should be reduced to λ/40 RMS. We propose a method to detect the piston error by analyzing the intensity distribution on the image plane according to the Fourier optics principle, which can capture segments with the piston errors ...
Junlun, Jiang, Weirui, Zhao
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Tip/tilt Alignment for a Fizeau Interferometer via Defocus-Based Sub-Spot Separation
IEEE Photonics Journal, 2020 It is a crucial premise for Fizeau interferometric imaging that all the optical axes of sub-apertures are well aligned. What is challenging in tip/tilt alignment of such interferometers is the superposition of all the sub-aperture spots on the ...
Wenyi Lv +8 more
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A next-generation ground array for the detection of ultrahigh-energy cosmic rays: the Fluorescence detector Array of Single-pixel Telescopes (FAST) [PDF]
EPJ Web of Conferences, 2019 The origin and nature of ultrahigh-energy cosmic rays (UHECRs) is one of the most intriguing and important mysteries in astroparticle physics. The two largest observatories currently in operation, the Telescope Array Experiment in central Utah, USA, and ...
Fujii Toshihiro +18 more
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Co-Phase Error Detection for Segmented Mirrors Based on Far-Field Information and Transfer Learning
PhotonicsThe resolution of a telescope is closely related to its aperture size; however, the aperture of a single primary mirror telescope cannot be indefinitely enlarged due to design and manufacturing constraints.
Kunkun Cheng +3 more
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Figure control for a segmented telescope mirror [PDF]
, 1979 The properties of a system to control the figure of a large telescope primary mirror that is composed of many individual segments are studied. 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 ...
Mast, T.S., Nelson, J.E.
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Wavefront Control Strategies for Large Active Thin Shell Primaries with Unimorph Actuators
Actuators, 2023 This paper presents various aspects of the wavefront control strategies for an ultra-lightweight composite reflector made of polymers for the large primary of a space telescope, and the shape control is made by a set of patterned unimorph strain ...
Kainan Wang, Yian Yu, André Preumont
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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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