Results 21 to 30 of about 142,915 (284)

The Extreme Learning Machine for the Extraction of Mono-Exponential Decay Time

IEEE Photonics Journal, 2023
The mono-exponential decay has been used to describe various physical phenomena such as cavity ring-down signal, fluorescence decay, etc. In this paper, a neural network method of extreme learning machine (ELM) is adopted to efficiently extract decay ...
Xing He, Zhongzhou Tian, Haiqi Lin, Shuai Wang, Ping Yang   +4 more
doaj   +1 more source

Adaptive Optics for Astronomy

, 2012
Adaptive Optics is a prime example of how progress in observational astronomy can be driven by technological developments. At many observatories it is now considered to be part of a standard instrumentation suite, enabling ground-based telescopes to ...
Arsenault R, Beuzit J-L, Bonaccini Calia D, Davies R, Ellerbroek BL, Ellerbroek BL, Foy R, Frogel J, Gendron E, Hubin N, Jones T, Labeyrie A, Markus Kasper, Merkle F, Merline WJ, Neichel B, Richard Davies, Riffel R, Rigaut F, Rousset G, Tyson RK, Wild V, Wizinowich P   +22 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

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

Opto-Electronic Advances, 2023
Integrating deformable mirrors within the optical train of an adaptive telescope was one of the major innovations in astronomical observation technology, distinguished by its high optical throughput, reduced optical surfaces, and the incorporation of the
Youming Guo, Kele Chen, Jiahui Zhou, Zhengdai Li, Wenyu Han, Xuejun Rao, Hua Bao, Jinsheng Yang, Xinlong Fan, Changhui Rao   +9 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

Fast Restoration of Aberration-Degraded Extended Object Based on Local Region Abstraction

IEEE Photonics Journal, 2018
The compensating capability of wavefront sensorless adaptive optics (WFSless AO) system for extended object images degraded by aberration is severely limited to correction speed due to largely sized images and low frame rate of camera.
Lianghua Wen, Ping Yang, Shuai Wang, Shanqui Chen, Wenjing LIU, Wei Bai, Zhiqiang Xu, Feilong Wang, Bing Xu   +8 more
doaj   +1 more source

Simulations of Adaptive Optics with a Laser Guide Star for SINFONI

, 2004
The SINFONI instrument for ESO's VLT combines integral field spectroscopy and adaptive optics (AO). We discuss detailed simulations of the adaptive optics module.
Brown, Anthony G A, Fedrigo, Enrico, van der Werf, Paul   +2 more
core   +1 more source

Robust control of a bimorph mirror for adaptive optics system [PDF]

, 2008
We apply robust control technics to an adaptive optics system including a dynamic model of the deformable mirror. The dynamic model of the mirror is a modification of the usual plate equation. We propose also a state-space approach to model the turbulent
Arzelier, Denis, Baudouin, Lucie, Guignard, Fabien, Prieur, Christophe   +3 more
core   +2 more sources

RMVAD-YOLO: A Robust Multi-View Aircraft Detection Model for Imbalanced and Similar Classes

Remote Sensing
Aircraft detection technology plays a vital role in civilian applications, with significant attention being devoted to research on related algorithms in recent years.
Keda Li, Xiangyue Zheng, Jingxin Bi, Gang Zhang, Yi Cui, Tao Lei   +5 more
doaj   +1 more source

A Real-Time Measurement System for Atmospheric Turbulence Intensity and Distribution Based on the GLAO System

Applied Sciences, 2023
Measuring the intensity and distribution of atmospheric optical turbulence at large-aperture astronomical telescope sites is crucial to optimizing turbulence correction for different layers.
Xian Ran, Lanqiang Zhang, Hua Bao, Xuejun Rao, Jinsheng Yang, Dingkang Tong, Cheng Wang, Changhui Rao   +7 more
doaj   +1 more source