Results 21 to 30 of about 21,242 (251)

Real-time turbulence profiling with a pair of laser guide star Shack–Hartmann wavefront sensors for wide-field adaptive optics systems on large to extremely large telescopes [PDF]

, 2010
Real-time turbulence profiling is necessary to tune tomographic wavefront reconstruction algorithms for wide-field adaptive optics (AO) systems on large to extremely large telescopes, and to perform a variety of image post-processing tasks involving ...
Ellerbroek, B. L., Gilles, L.
core   +1 more source

Study on Aberration Correction of Adaptive Optics Based on Convolutional Neural Network

Photonics, 2021
The existence of aberrations has always been an important limiting factor in the imaging field. Especially in optical microscopy imaging, the accumulated aberration of the optical system and the biological samples distorts the wavefront on the focal ...
Jin Li, Luwei Wang, Yong Guo, Yangrui Huang, Zhigang Yang, Wei Yan, Junle Qu   +6 more
doaj   +1 more source

Impact of CMOS Pixel and Electronic Circuitry in the Performance of a Hartmann-Shack Wavefront Sensor

Sensors, 2018
This work presents a numerical simulation of a Hartmann-Shack wavefront sensor (WFS) that assesses the impact of integrated electronic circuitry on the sensor performance, by evaluating a full detection chain encompassing wavefront sampling ...
Úrsula Vasconcelos Abecassis, Davies William de Lima Monteiro, Luciana Pedrosa Salles, Carlos Augusto de Moraes Cruz, Pablo Nunes Agra Belmonte   +4 more
doaj   +1 more source

Fast minimum variance wavefront reconstruction for extremely large telescopes [PDF]

, 2010
We present a new algorithm, FRiM (FRactal Iterative Method), aiming at the reconstruction of the optical wavefront from measurements provided by a wavefront sensor.
Béchet, Ellerbroek, Eric Thiébaut, Fried, Fried, Gendron, Gilles, Gilles, Gilles, Gilles, Herrmann, Lane, Le Louarn, Le Roux, MacMartin, Michel Tallon, Poyneer, Poyneer, Roddier, Skilling, Southwell, Tarantola, Vogel, Vogel, Wild, Yang   +25 more
core   +1 more source

Efficient Irregular Wavefront Propagation Algorithms on Hybrid CPU-GPU Machines [PDF]

, 2012
In this paper, we address the problem of efficient execution of a computation pattern, referred to here as the irregular wavefront propagation pattern (IWPP), on hybrid systems with multiple CPUs and GPUs.
Cooper, Lee, Kong, Jun, Kurc, Tahsin, Pan, Tony, Saltz, Joel, Teodoro, George   +5 more
core   +1 more source

Wavefront reconstruction by modal decomposition

Optics Express, 2012
We propose a new method to determine the wavefront of a laser beam based on modal decomposition by computer-generated holograms. The hologram is encoded with a transmission function suitable for measuring the amplitudes and phases of the modes in real-time. This yields the complete information about the optical field, from which the Poynting vector and
Christian, Schulze, Darryl, Naidoo, Daniel, Flamm, Oliver A, Schmidt, Andrew, Forbes, Michael, Duparré   +5 more
openaire   +2 more sources

Wavefront curvature sensing for the human eye [PDF]

, 2008
In this paper we present a curvature wavefront sensor for the eye. The layout proposed is novel, whilst the algorithm used has been adapted from previously published work [Roddier, F.; Roddier, C. Appl. Opt. 1991, 30, 1325–1327]. The design of the set-up
Cristiano Torti, Gupta A, Iglesias I, Luis Diaz-santana, Otten LJ, Steve Gruppetta   +5 more
core   +1 more source

Optical Wavefront Reconstruction: Theory and Numerical Methods [PDF]

SIAM Review, 2002
Summary: Optical wavefront reconstruction algorithms played a central role in the effort to identify gross manufacturing errors in NASA's Hubble Space Telescope (HST). NASA's success with reconstruction algorithms on the HST has led to an effort to develop software that can aid and in some cases replace complicated, expensive, and error-prone hardware.
Luke, D. Russell, Burke, James V., Lyon, Richard G.   +2 more
openaire   +3 more sources

Simulation Analysis of an Atmospheric Turbulence Wavefront Measurement System

Photonics
In this paper, a turbulent wavefront measurement model based on the Hartmann system structure is proposed. The maximum recognizable mode number of different lens units is discussed, and the influence of different lens array arrangements on the accuracy ...
Gangyu Wang, Laian Qin, Yang Li, Yilun Cheng, Xu Jing, Gongye Chen, Zaihong Hou   +6 more
doaj   +1 more source

Fourier transform-wavefront reconstruction for the pyramid wavefront sensor [PDF]

1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, 2010
The application of Fourier-transform reconstruction techniques to the pyramid wavefront sensor has been investigated. A preliminary study based on end-to-end simulations of an adaptive optics system with ≈40x40 subapertures and actuators shows that the performance of the Fourier-transform reconstructor (FTR) is of the same order of magnitude than the ...
Quirós-Pacheco, Fernando, Correia, Carlos, Esposito, Simone   +2 more
openaire   +2 more sources