Results 1 to 10 of about 714 (189)

Piston Error Measurement for Segmented Telescopes Based on a Hybrid Artificial Neural Network [PDF]

Sensors, 2023
To address the difficulty and complexity of detecting piston errors for segmented telescopes, this paper proposes a new piston error measurement method based on a hybrid artificial neural network.
Dan Yue, Pengcheng Song, Chongshuai Wang, Yahui Chuai   +3 more
doaj   +2 more sources

Research on Micro-Vibration Analysis of Segmented Telescope Based on Opto-Mechanical Integration [PDF]

Sensors
Aiming at the inherent nature and complexity of the influence of in-orbit micro-vibration in the imaging quality of segmented telescopes, a dynamic full-link opto-mechanical integration analysis method is proposed.
Kangmin Wen, Lingjie Wang, Xuefeng Zeng, Yang Liu, Wenyan Li, Lianqiang Wang, Wei Sha, Di Zhou   +7 more
doaj   +2 more sources

Piston Error Automatic Correction for Segmented Mirrors via Deep Reinforcement Learning [PDF]

Sensors
The 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
doaj   +2 more sources

Kinematically engaged yoke system for segmented lens-based space telescope integration and testing

Journal of the European Optical Society-Rapid Publications, 2023
One of the most profound and philosophically captivating foci of modern astronomy is the study of Earth-like exoplanets in the search for life in the Universe.
Esparza Marcos, Choi Heejoo, Brar Nicholas, Wang Zichan, Kim Youngsik, Fellows Chuck, Bog Mingab, Kim Gunhee, Yi Allen, Milster Tom D., Apai Dániel, Kim Daewook   +11 more
doaj   +1 more source

Recent results from prototypes of the Fluorescence detector Array of Single-pixel Telescopes (FAST) in both hemispheres [PDF]

EPJ Web of Conferences, 2023
The origin and nature of ultrahigh-energy cosmic rays (UHECRs) are of uppermost importance in astroparticle physics. Motivated by the need for an unprecedented aperture for further advancements, the Fluorescence detector Array of Single-pixel Telescopes (
Fujii Toshihiro, Albury Justin, Bradfield Fraser, Bellido Jose A., Chytka Ladislav, Farmer John, Hamal Petr, Horvath Pavel, Hrabovsky Miroslav, Iwasaki Hiromu, Jilek Vlastimil, Kmec Jakub, Kvita Jiri, Malacari Max, Mandat Dusan, Mastrodicasa Massimo, Matthews John N., Michal Stanislav, Nagasawa Hiromu, Namba Hiroki, Ni Xiaochen, Nozka Libor, Oka Tomohiko, Palatka Miroslav, Pech Miroslav, Privitera Paolo, Schovanek Petr, Salamida Francesco, Smida Radomir, Svozilikova Zuzana, Thomas Stan B., Taketa Akimichi, Terauchi Kenta, Travnicek Petr, Vacula Martin   +34 more
doaj   +1 more source

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, Daichi Uchida, Masaru Kino, Mikio Kurita, Katsuhiko Yamada   +4 more
doaj   +1 more source

Piston Error Measurement for Segmented Telescopes with an Artificial Neural Network

Sensors, 2021
A piston error detection method is proposed based on the broadband intensity distribution on the image plane using a back-propagation (BP) artificial neural network.
Dan Yue, Yihao He, Yushuang Li
doaj   +1 more source

Large Piston Error Detection Method Based on the Multiwavelength Phase Shift Interference and Dynamic Adjustment Strategy

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, Zihao Yin, Youlong Ke, Yinnian Liu   +3 more
doaj   +1 more source

Advances in optical engineering for future telescopes

Opto-Electronic Advances, 2021
Significant optical engineering advances at the University of Arizona are being made for design, fabrication, and construction of next generation astronomical telescopes. This summary review paper focuses on the technological advances in three key areas.
Daewook Kim, Heejoo Choi, Trenton Brendel, Henry Quach, Marcos Esparza, Hyukmo Kang, Yi-Ting Feng, Jaren N. Ashcraft, Xiaolong Ke, Tianyi Wang, Ewan S. Douglas   +10 more
doaj   +1 more source

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, Fei Yang, Fuguo Wang, Baowei Lu   +3 more
doaj   +1 more source