Results 41 to 50 of about 5,505 (209)
Results from the GMT Ground-Layer Experiment at the Magellan Telescopes [PDF]
, 2006 We present results from our two year study of ground-layer turbulence as seen through the 6.5-meter Magellan Telescopes at Las Campanas Observatory. The experiment consists of multiple, moderate resolution, Shack-Hartmann wavefront sensors deployed over ...
Athey, A. +3 more
core +3 more sources
Detection of phase singularities with a Shack-Hartmann wavefront sensor
, 2006 While adaptive optical systems are able to remove moderate wavefront distortions in scintillated optical beams, phase singularities that appear in strongly scintillated beams can severely degrade the performance of such an adaptive optical system ...
Aksenov +19 more
core +1 more source
Compressive Wavefront Sensing with Weak Values [PDF]
, 2014 We demonstrate a wavefront sensor based on the compressive sensing, single-pixel camera. Using a high-resolution spatial light modulator (SLM) as a variable waveplate, we weakly couple an optical field's transverse-position and polarization degrees of ...
Howell, John C. +2 more
core +3 more sources
, 2018 We present a multi-conjugate adaptive optics (MCAO) system simulator bench, HeNOS (Herzberg NFIRAOS Optical Simulator). HeNOS is developed to validate the performance of the MCAO system for the Thirty Meter Telescope, as well as to demonstrate techniques
Andersen, David +7 more
core +1 more source
Ground-layer wavefront reconstruction from multiple natural guide stars [PDF]
, 2007 Observational tests of ground layer wavefront recovery have been made in open loop using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona.
Athey A. +17 more
core +3 more sources
Accuracy of Shack-Hartmann wavefront sensor using a coherent wound fibre image bundle
, 2018 Shack-Hartmann wavefront sensors using wound fibre bundles are desired for multi-object adaptive optical systems to provide large multiplex positioned by Starbugs.
Goodwin, Michael +2 more
core +1 more source
Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device
Micromachines, 2019 The Hartmann⁻Shack wavefront sensor is widely used to measure aberrations in both astronomy and ophthalmology. Yet, the dynamic range of the sensor is limited by cross-talk between adjacent lenslets.
Alessandra Carmichael Martins +1 more
doaj +1 more source
Frontiers in Astronomy and Space Sciences, 2021 The Deformable Mirror Demonstration Mission (DeMi) is a technology demonstration CubeSat to test a 140 actuator micro-electromechanical system (MEMS) deformable mirror in low-Earth orbit.
Ewan S. Douglas +12 more
doaj +1 more source
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
International Journal of Energy Research, Volume 2026, Issue 1, 2026.The investigation focuses on the natural convection of magnetohydrodynamic (MHD) double‐diffusive nanoencapsulated phase change material (NEPCM) in an annulus composed of square and concentric horizontal circular cylinders. The right, upper, and bottom walls of the outer square cylinder are cooled, while the inner circular cylinder is heated. The NEPCM
Md. Mahadul Islam +5 more
wiley +1 more source