Results 11 to 20 of about 7,316 (282)
Decoupled Object-Independent Image Features for Fine Phasing of Segmented Mirrors Using Deep Learning [PDF]
Remote Sensing, 2022 A segmented primary mirror is very important for extra-large astronomical telescopes, in order to detect the phase error between segmented mirrors. Traditional iterative algorithms are hard to detect co−phasing aberrations in real time due to the long ...
Yirui Wang +4 more
doaj +2 more sources
Design Analysis of a Passive Buffer System for Space-Assembled Segmented Mirrors [PDF]
Applied Sciences, 2019 This paper presents a passive buffer system of connection mechanism for space-assembled segmented mirrors. The purpose of assembling telescope in space is to overcome the limits of launch volume and mass to support ever increasing aperture sizes.
Xupeng Li +4 more
doaj +2 more sources
Towards Piston Fine Tuning of Segmented Mirrors through Reinforcement Learning [PDF]
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
doaj +2 more sources
Large lightweight segmented mirrors for adaptive optics [PDF]
, 2008 This paper examines the possibility of constructing deformable mirrors for adaptive optics with a large number of degrees of freedom, by assembling segmented silicon mirrors with bimorph piezoelectric actuation.
Villon, Pierre F. +7 more
core +3 more sources
Photonics, 2022 As the loading space in rockets and mirror fabrication technology is limited, optical systems in space cannot have large optical apertures. However, the successful launch and excellent performance of the James Webb Telescope indicate that segmented ...
Rongjie Qin +3 more
doaj +1 more source
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
doaj +1 more source
A Novel Tandem Differential Edge Sensor Layout for Segmented Mirror Telescopes
Sensors, 2023 The performance of an active control system, crucial for the co-phase maintenance of segmented mirrors, is closely related to the spatial layout of sensors and actuators.
Yinlong Huo +5 more
doaj +1 more source
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
openaire +3 more sources
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
An Efficient Correction Algorithm for Eliminating Image Misalignment Effects on Co-Phasing Measurement Accuracy for Segmented Active Optics Systems. [PDF]
PLoS ONE, 2016 The misalignment between recorded in-focus and out-of-focus images using the Phase Diversity (PD) algorithm leads to a dramatic decline in wavefront detection accuracy and image recovery quality for segmented active optics systems.
Dan Yue +3 more
doaj +1 more source