Results 31 to 40 of about 1,424,437 (265)

Commissioning of ARGOS at LBT: adaptive optics procedures [PDF]

, 2015
ARGOS is the laser guide star facility of the Large Binocular Telescope (LBT). It implements a Rayleigh Laser Guide Star system that provides Ground Layer Adaptive Optics (GLAO) correction for the LUCIs, the 2 wide- field near-infrared imagers and multi ...
Deysenroth, Matthias, Gaessler, Wolfgang, Raab, Walfried, Raab, W., Organ de Xivry, G., Storm, J., Peter, D., Puglisi, Alfio, Sivitilli, A., Gemperlien, H., Gemperlein, Hans, Kulas, M., ESPOSITO, Simone, Borelli, Jose, Rabien, Sebastian, PUGLISI, Alfio Timothy, Ziegleder, Julian, Orban de Xivry, Gilles, Rahmer, G., Mazzoni, Tommaso, Sivitilli, Alex, Storm, Jesper, BONAGLIA, MARCO, Rahmer, Gustavo, Lefebvre, Michael, Peter, Diethard, Mazzoni, T., Lefebvre, M., Kulas, Martin, Ziegleder, J., BUSONI, LORENZO, Rabien, S.   +31 more
core   +1 more source

FPGA-accelerated adaptive optics wavefront control

, 2022
Paper 897802The speed of real-time adaptive optical systems is primarily restricted by the data processing hardware and computational aspects. Furthermore, the application of mirror layouts with increasing numbers of actuators reduces the bandwidth ...
Reger, Johann, Mauch, Steffen, Goy, Matthias, Appelfelder, Michael, Tünnermann, Andreas, Reinlein, Claudia, Beckert, Erik   +6 more
core   +1 more source

Optimization of Iterative Control Algorithms for High-Resolution Adaptive Optics Systems

IEEE Photonics Journal
As the number of wavefront sensor subapertures and deformable mirror actuators in adaptive optics systems increases, the computational time of the direct gradient wavefront control algorithm is excessively long, which is a major factor affecting the ...
Shenghu Liu, Wang Zhao, Shuai Wang, Kangjian Yang, Ping Yang, Hongli Guan, Han Guo, Ruifeng He   +7 more
doaj   +1 more source

Adaptive Optics Tip-Tilt Correction Based on Smith Predictor and Filter-Optimized Linear Active Disturbance Rejection Control Method

Sensors, 2023
A tip-tilt mirror (TTM) control method is designed to enhance the control bandwidth and ensure the rejection performance of the adaptive optics (AO) tip-tilt correction system.
Lingxi Kong, Kangjian Yang, Chunxuan Su, Sicheng Guo, Shuai Wang, Tao Cheng, Ping Yang   +6 more
doaj   +1 more source

Astronomical adaptive optics: a review

PhotoniX
Since the concept of adaptive optics(AO) was proposed in 1953, AO has become an indispensable technology for large aperture ground-based optical telescopes aimed at high resolution observations.
Changhui Rao, Libo Zhong, Youming Guo, Min Li, Lanqiang Zhang, Kai Wei   +5 more
doaj   +1 more source

Cross-Correlation Algorithm Based on Speeded-Up Robust Features Parallel Acceleration for Shack–Hartmann Wavefront Sensing

Photonics
A cross-correlation algorithm to obtain the sub-aperture shifts that occur is a crucial aspect of scene-based SHWS (Shack–Hartmann wavefront sensing).
Linxiong Wen, Xiaohan Mei, Yi Tan, Zhiyun Zhang, Fangfang Chai, Jiayao Wu, Shuai Wang, Ping Yang   +7 more
doaj   +1 more source

Centroid-Predicted Deep Neural Network in Shack-Hartmann Sensors

IEEE Photonics Journal, 2022
The Shack-Hartmann wavefront sensor produces incorrect wavefront measurements when some sub-spots are weak and missing. In this paper, a method is proposed to predict the centroids of these sub-spots for the Shack-Hartmann wavefront sensor based on the ...
Mengmeng Zhao, Wang Zhao, Shuai Wang, Ping Yang, Kangjian Yang, Haiqi Lin, Lingxi Kong   +6 more
doaj   +1 more source

Effectiveness of Resistance Intradialytic Exercise Compared to Aerobic Intradialytic Exercise for Patients With Chronic Kidney Disease: A Randomized Controlled Clinical Trial

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Patients with chronic kidney disease undergoing hemodialysis commonly experience reduced physical function, fatigue, poor sleep quality, and impaired health‐related quality of life. Intradialytic exercise has been proposed as a non‐pharmacological strategy to improve these outcomes.
Klebson da Silva Almeida, Gisela Cristiane Miyamoto, Daniel da Costa Torres, Ian Setubal Reis Chaves, Jonas do Carmo Paschoalin, Braúlio Lima Nascimento, Luciana Dias Chiavegato   +6 more
wiley   +1 more source

Image sharpening metrics and search strategies for indirect adaptive optics [PDF]

, 2000
Adaptive optics is concerned with the correction of turbulence induced aberrations and mis-alignments in optical systems. It is an expensive and complicated technology which has been developed for astronomy and defence applications.
Doble, N., Doble, Nathan
core  

Solar adaptive optics system using electromagnetic deformable mirror [PDF]

, 2009
A solar adaptive optics system has been improved by using a high-speed electromagnetic deformable mirror and adopting a modified sum-of-absolute-differences algorithm in wavefront sensing.
Noto, Yuuki, Miura, Noriaki, Baba, Naoshi, Hanaoka, Yoichiro, Ichimoto, Kiyoshi, Kato, Shuusuke, Kuwamura, Susumu, Ueno, Satoru, Takami, Hideki, Yokoyama, Fumihito, Nagata, Shin’ichi, Kitai, Reizaburou   +11 more
core   +1 more source