Buscar
Mostrando ítems 1-10 de 558
Temporal correlations imaging fixed targets through turbulence
(Optical Society of America, 2016-06)
We study the temporal correlations from dynamic imaging through turbulence using incoherent light from fixed highcontrast targets. We conduct our experiment in controlled laboratory conditions using several values of the ...
Estimation of C2n based on scintillation of fixed targets imaged through atmospheric turbulence
(Optical Society Of America, 2015-12)
We define a pixel-based scintillation index for dynamic incoherent imaging of fixed high-contrast targets through atmospheric turbulence. We propose a simple setup to study this parameter varying the C2n constant in ...
Evaluation of effective eddy diffusive coefficients using radar observations of turbulence in the stratosphere
(American Geophysical Union, 1984-03)
Radar observations show that thin persistent layers of turbulence occur sporadically in the troposphere and stratosphere. Two probabilistic approaches are used to show that the vertical eddy diffusivity due to such layers ...
The effect of buildings on atmospheric turbulence in open spaces in Western Sao Paulo State, Brazil
(Univ Politecnica Valencia, 2018-01-01)
This paper seeks to identify a pattern of air turbulence that reflects the effect of buildings on air turbulence characteristics measured in open spaces in Western Sao Paulo State, Brazil. Atmospheric turbulence was estimated ...
Multifractality and the effect of turbulence on the chaotic dynamics of a He-Ne laser
(Spie, 2013-09)
We propose the use of multifractal detrended fluctuation analysis (MF-DFA) to measure the influence of atmospheric turbulence on the chaotic dynamics of a HeNe laser. Fit ranges for MF-DFA are obtained with goodness of ...
Mode analysis of higher-order transverse-mode correlation beams in a turbulent atmosphere
(Universidade Federal de Minas GeraisBrasilICX - DEPARTAMENTO DE FÍSICAUFMG, 2017)
Adaptive low density parity check encoder for a complete free space optics/continuous variable-quantum key distribution system using commercially available off-the-shelf devices for variable throughput network considering dynamical atmospheric turbulence levels
(2018-09)
In this paper, an adaptive low density parity check (LDPC). encoder for complete Free Space Optics/Continuous Variable-Quantum Key Distribution (FSO/CV-QKD) system using a Commercially available Off-The-Shelf (COTS) device ...
Review of wave-turbulence interactions in the stable atmospheric boundary layer
(American Geophysical Union, 2015-09)
Flow in a stably stratified environment is characterized by anisotropic and intermittent turbulence and wavelike motions of varying amplitudes and periods. Understanding turbulence intermittency and wave-turbulence ...
Beam wandering statistics of twin thin laser beam propagation under generalized atmospheric conditions
(Optical Society of America, 2012-11-29)
Under the Geometrics Optics approximation is possible to estimate the covariance between the displacements of two thin beams after they have propagated through a turbulent medium. Previous works have concentrated in long ...