Results 51 to 60 of about 957,049 (196)
Profiling the turbulent atmosphere and novel correction techniques for imaging and photometry in astronomy [PDF]
, 2010 The turbulent atmosphere has two detrimental effects in astronomy. The phase aberration induced by the turbulence broaden the point spread function (PSF) and limits the resolution for imaging.
OSBORN, JAMES
core
Inverse modeling of European CH4 emissions: sensitivity to the observational network [PDF]
, 2009 Inverse modeling is widely employed to provide “top-down” emission estimates using atmospheric measurements. Here, we analyze the dependence of derived CH4 emissions on the sampling frequency and density of the observational surface network, using the ...
Bergamaschi, P. +9 more
core +2 more sources
BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence [PDF]
, 2009 Free-space optical communications (FSO) propagated over a clear atmosphere suffers from irradiance fluctuation caused by small but random atmospheric temperature fluctuations.
Ghassemlooy, Zabih +3 more
core +1 more source
Atmospheric monitoring for the H.E.S.S. experiment using a single scattering lidar [PDF]
, 2009 The High Energy Stereoscopic System (H.E.S.S.) is an array of 4 telescopes located in Namibia, which use the imaging atmospheric Cherenkov technique (IACT) to study astrophysical emission of gamma radiation in the energy window from 100 GeV to 50 TeV ...
Rulten, Cameron Boyd
core
Experimental Characterisation and Modelling of Atmospheric Fog and Turbulence in FSO [PDF]
, 2013 Free space optical (FSO) communication uses visible or infrared (IR) wavelengths to broadcast high-speed data wirelessly through the atmospheric channel.
Ijaz, Muhammad
core
Retrieval of Solar Shortwave Irradiance from All-Sky Camera Images
Remote SensingThe present work proposes a new model based on a convolutional neural network (CNN) to retrieve solar shortwave (SW) irradiance via the estimation of the cloud modification factor (CMF) from daytime sky images captured by all-sky cameras; this model is ...
Daniel González-Fernández +16 more
doaj +1 more source
Photonics, 2023 Based on the extended Huygens–Fresnel principle and infinitely long phase screen, the scintillation index and the aperture averaging effect of partially coherent beams in computational ghost imaging (CGI) with a finite bucket detector through atmospheric
Hanling Deng +6 more
doaj +1 more source
Laboratory experiments in atmospheric optics
Applied Optics, 1998 Old and new laboratory experiments on atmospheric optics with a focus on mirages, rainbows, and halos are presented. Some qualitative demonstrations serve primarily didactical purposes, e.g., by proving the existence of curved light rays in media with a gradient of the index of refraction, by directly visualizing the minimum-deviation curve for rainbow
M, Vollmer, R, Tammer
openaire +3 more sources
Micro-Deformable Mirror: a low cost technology for cryogenic active and adaptive optics [PDF]
, 1999 Electrostatically operated bi-directional deflecting silicon membranes can be created using bulk micromachining techniques. The 19-channel Micro-Deformable Mirror, potential candidate for space Active and Adaptive Optics, was built by OKO Technologies ...
Bonicel, Sebastien Louis
core
Atmosphere, 2019 Through the observation of ground-based LIDAR and satellite sensors, the weather conditions of continuous foggy-hazy alternations in the Huainan region from 26 December 2016 to 5 January 2017 were analyzed and observed.
Songlin Fu +6 more
doaj +1 more source