Results 61 to 70 of about 2,024,523 (345)
Wavefront sensors for adaptive optical systems [PDF]
Measurement Science Review, 2008 Possibilities of constructing a wavefront sensor for the adaptive system in the Big Solar Vacuum Telescope are considered. A modified correlation tracker (MCT) is proposed. The sensor is tested by measuring the displacement of the image of the solar granulation pattern in the first and second foci of the telescope under clear vision conditions.
O. N. Emaleev +4 more
openaire +4 more sources
A new low-cost, compact, auto-phoropter for refractive assessment in developing countries
Scientific Reports, 2017 Using a phoropter to measure the refractive error is one of the most commonly used methods by ophthalmologists and optometrists. Here, we demonstrate design and fabrication of a portable automatic phoropter with no need for patient’s feedback. The system
Babak Amirsolaimani +4 more
doaj +1 more source
Visible and Near-infrared Laboratory Demonstration of a Simplified Pyramid Wavefront Sensor [PDF]
Publications of the Astronomical Society of the Pacific, 2019 Wavefront sensing and control are important for enabling one of the key advantages of using large apertures, namely higher angular resolution. Pyramid wavefront sensors are becoming commonplace in new instrument designs owing to their superior ...
J. Lozi +6 more
semanticscholar +1 more source
Photonics, 2023 Atmospheric turbulence causes refractive index fluctuations, which in turn introduce extra distortions to the wavefront of the propagated radiation. It ultimately degrades telescope resolution (in imaging applications) and reduces radiation power density
Ilya Galaktionov +4 more
doaj +1 more source
Demonstrating predictive wavefront control with the Keck II near-infrared pyramid wavefront sensor [PDF]
Optical Engineering + Applications, 2019 The success of ground-based instruments for high contrast exoplanet imaging depends on the degree to which adaptive optics (AO) systems can mitigate atmospheric turbulence.
R. Jensen-Clem +7 more
semanticscholar +1 more source
An Optical Wavefront Sensor Based on a Double Layer Microlens Array
Sensors, 2011 In order to determine light aberrations, Shack-Hartmann optical wavefront sensors make use of microlens arrays (MLA) to divide the incident light into small parts and focus them onto image planes.
Hsiang-Chun Wei +3 more
doaj +1 more source
Wavefront Reconstruction of Shack-Hartmann with Under-Sampling of Sub-Apertures
Photonics, 2023 Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
Jian Huang +3 more
doaj +1 more source
Review on methods for wavefront reconstruction from pyramid wavefront sensor data
, 2020 . Pyramid wavefront sensors are planned to be a part of many instruments that are currently under development for the extremely large telescopes (ELT).
I. Shatokhina +2 more
semanticscholar +1 more source
X-ray wavefront characterization with two-dimensional wavefront sensors: shearing interferometers and Hartmann wavefront sensors [PDF]
SPIE Proceedings, 2012 Phase reconstructions from a two-dimensional shearing inter- ferometer, based on two orthogonal phase gratings in a single plane, and a Hartmann sensor are compared. Design alternatives for both wavefront sensors are given, and simulated performance of both the two-dimen- sional x-ray shearing interferometer and Hartmann wavefront sensor are presented ...
openaire +4 more sources
Design and Applications of Multi‐Frequency Programmable Metamaterials for Adaptive Stealth
Advanced Functional Materials, EarlyView.This article provides a comprehensive overview of metamaterials, including their fundamental principles, properties, synthesis techniques, and applications in stealth, as well as their challenges and future prospects. It covers topics that are more advanced than those typically discussed in existing review articles, while still being closely connected ...
Jonathan Tersur Orasugh +4 more
wiley +1 more source