Results 51 to 60 of about 3,276,689 (342)
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 +6 more
doaj +1 more source
On-sky wide field adaptive optics correction using multiple laser guide stars at the MMT [PDF]
, 2008 We describe results from the first astronomical adaptive optics system to use multiple laser guide stars, located at the 6.5-m MMT telescope in Arizona. Its initial operational mode, ground-layer adaptive optics (GLAO), provides uniform stellar wavefront
Baranec +40 more
core +2 more sources
Adaptive optics with an infrared pyramid wavefront sensor at Keck
Journal of Astronomical Telescopes Instruments and Systems, 2020 . The study of cold or obscured, red astrophysical sources can significantly benefit from adaptive optics (AO) systems employing infrared (IR) wavefront sensors.
C. Bond +20 more
semanticscholar +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 +6 more
doaj +1 more source
Delhi Journal of Ophthalmology, 2015 Physicists and ophthalmologists, since time immemorial have aggressively tried to break new ground in trying to get a good look at the retina and its myriad pathologies. Although fundus photography, optical coherence tomography and fundus fluorescein angiography have largely been very successful in imaging the retina and give a clear understanding of ...
Apoorva Ayachit +6 more
openaire +3 more sources
Origin of cell contrast in offset aperture adaptive optics ophthalmoscopy.
Optics Letters, 2020 Offset aperture and split detector imaging are variants of adaptive optics scanning ophthalmoscopy recently introduced to improve the image contrast of retinal cells.
Andres Guevara-Torres +2 more
semanticscholar +1 more source
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 +4 more
doaj +1 more source
The Durham adaptive optics real-time controller: Capability and ELT suitability [PDF]
, 2012 The Durham adaptive optics real-time controller is a generic, high performance real-time control system for astronomical adaptive optics systems. It has recently had new features added as well as performance improvements, and here we give details of these, as well as ways in which optimisations can be made for specific adaptive optics systems and ...
arxiv +1 more source
Optics Express, 2020 We theoretically investigate the effectiveness of adaptive optics correction for Gaussian beams affected by oceanic turbulence. Action of an idealized adaptive optics system is modeled as a perfect removal of a certain number of Zernike modes from the ...
I. Toselli, S. Gladysz
semanticscholar +1 more source
Optimization of Iterative Control Algorithms for High-Resolution Adaptive Optics Systems
IEEE Photonics JournalAs 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 +7 more
doaj +1 more source