Design and Parameter Identification for a Positioning Platform with a Large Stroke and High Precision for Segmented Mirrors [PDF]
Micromachines, 2023 An active optical system with three segmented mirrors was proposed to verify the co-focus and co-phase progress. In this system, a kind of large-stroke and high-precision parallel positioning platform was specially developed to help support the mirrors ...
Zihao Yin +6 more
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Piston Error Automatic Correction for Segmented Mirrors via Deep Reinforcement Learning [PDF]
SensorsThe segmented mirror co-phase error identification technique based on supervised learning methods has the advantages of simple application conditions, no dependence on custom sensors, a fast calculation speed, and low computing power requirements ...
Dequan Li, Dong Wang, Dejie Yan
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Design and Error Analysis of an Optical Measurement System for the Wavefront of Large-Aperture Segmented Mirror [PDF]
SensorsTo better meet the wavefront measurement requirements for large-aperture segmented mirrors after in-orbit deployment, this paper designs a measurement system based on an optical camera and targets.
Yukun He +5 more
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Large sparse aperture telescope wavefront sensing and control via pretrained neural network with attention module [PDF]
Scientific ReportsThe ability to detect pistons with high accuracy over a wide range is paramount to the co-phasing of sparse aperture optical systems. This paper proposes a global piston error modulation method for sparse aperture mirrors based on convolutional neural ...
Yuchen Li +3 more
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Investigation into the Co-Phase Detection Methodology for Segmented Plane Mirrors Utilizing Grazing Incidence Interferometry [PDF]
SensorsSegmented plane mirrors constitute a crucial component in the self-aligned detection process for large-aperture space optical imaging systems. Surface shape errors inherent in segmented plane mirrors primarily manifest as tilt errors and piston errors ...
Rengcong Liu, Jiang Guo, Yibo Li
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Design considerations for a highly segmented mirror [PDF]
Applied Optics, 2003 Design issues for a 30-m highly segmented mirror are explored, with emphasis on parametric models of simple, inexpensive segments. A mirror with many small segments offers cost savings through quantity production and permits high-order active and adaptive wave-front corrections.
Padin, Stephen
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In-plane effects on segmented-mirror control [PDF]
Applied Optics, 2012 Extremely large optical telescopes are being designed with primary mirrors composed of hundreds of segments. The "out-of-plane" piston, tip, and tilt degrees of freedom of each segment are actively controlled using feedback from relative height measurements between neighboring segments.
MacMynowski, Douglas G. +4 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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Active Optics and Aberration Correction Technology for Sparse Aperture Segmented Mirrors
Applied Sciences, 2023 Active optics and aberration correction techniques for sparse aperture segmented mirrors are studied. A finite element model of the sparse aperture segmented mirror was established, and a multi-aperture aberration polynomial was derived. According to the
Benlei Zhang +3 more
doaj +1 more source
Polarimetric characterization of segmented mirrors
Applied Optics, 2022 We study the impact of the loss of axial symmetry around the optical axis on the polarimetric properties of a telescope with a segmented primary mirror when each segment is present in a different aging stage. The different oxidation stage of each segment as it is substituted in time leads to nonnegligible cross-talk terms.
Pastor Yabar, A. +3 more
openaire +3 more sources