Results 241 to 250 of about 10,202,208 (291)

Optical propagation through non-Kolmogorov turbulence

Science China Information Sciences, 2012
In this paper, the effects of the generalized exponent, the height and the zenith angle on the log-amplitude variance in the weak fluctuation are investigated. The theoretical results indicate that for the downlink, the log-amplitude variance of the Kolmogorov model is always smaller than that of the three-layer model, while for the uplink, there is a ...
Hua Tang, BaoLin Ou
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Non-Kolmogorov Turbulence: Does it matter?

OSA Imaging and Applied Optics Congress 2021 (3D, COSI, DH, ISA, pcAOP), 2021
We investigate the impact of non-Kolmogorov turbulence on a propagating beam by examining the resulting Rytov variance, Fried parameter, isoplanatic angle and beam radius with particular consideration of the generalized structure function parameter.
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Zernike expansions for non-Kolmogorov turbulence

Journal of the Optical Society of America A, 1996
We investigate the expression of non-Kolmogorov turbulence in terms of Zernike polynomials. Increasing the power-law exponent of the three-dimensional phase power spectrum from 2 to 4 results in a higher proportion of wave-front energy being contained in the tilt components.
Boreman, Glenn D., Dainty, Christopher
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Phase Screen Generation for Non-Kolmogorov Turbulence

Imaging and Applied Optics Congress 2022 (3D, AOA, COSI, ISA, pcAOP), 2022
Measurements of atmospheric turbulence frequently show non-Kolmogorov statistics. This paper explores two methods of numerical phase screen generation for such turbulence. The results show that both methods are accurate, but one runs 285 times faster.
Jason Salmanowitz, Noah R. Van Zandt
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Non-Kolmogorov turbulence

Imaging and Applied Optics 2017 (3D, AIO, COSI, IS, MATH, pcAOP), 2017
Occasionally, non-Kolmogorov turbulence plays an important role for optical propagation in the turbulent atmosphere. Here, we discuss two major causes of non-Kolmogorov turbulence: Batchelor scaling in the viscous-convective range, and anisotropy.
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Violation of Bell’s Inequality and non-Kolmogorovness

AIP Conference Proceedings, 2009
In this paper we would like to stress that, besides two commonly discussed conditions inducing violation of Bell’s inequality—nonlocality and death of realism—there is the third condition having the same consequence. This is the condition of probabilistic incompatibility (PI) of random variables—impossibility to realize them on a single probability ...
Andrei Khrennikov, Luigi Accardi, Guillaume Adenier, Christopher Fuchs, Gregg Jaeger, Andrei Yu. Khrennikov, Jan-Åke Larsson, Stig Stenholm   +7 more
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Measurement of a Non-Kolmogorov Structure Function

Adaptive Optics, 1996
The structure function of atmospheric phase fluctuations is defined as follows: A generalised model for the structure function of phase is: ℛ 0 is related to the size of the long-exposure image formed by a large-aperture telescope, while γ ß is a parameter which depends on ß and on the precise definition of ℛ 0 The ...
Tom Nicholls, Nicholas J. Wooder, Christopher Dainty   +2 more
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Differential piston phase variance in non-Kolmogorov atmospheres

Journal of the Optical Society of America A, 2017
We derive a generalized expression for the differential piston phase variance in non-Kolmogorov turbulence. Specifically, our result applies in the case where index of refraction is described by a power-law medium with an exponent between 0 and 1. Kolmogorov assumptions of homogeneity and isotropy are maintained.
Jeremy P, Bos, V S, Rao Gudimetla, Jason D, Schmidt   +2 more
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Dual non-Kolmogorov cascades in a von Kármán flow

EPL (Europhysics Letters), 2012
The experimental spatial power spectrum of the velocity fluctuations in a von Karman flow is measured, in a wide range of Reynolds numbers, 102 105.
Herbert, E., Daviaud, F., Dubrulle, Bérengère, Nazarenko, S., Naso, Aurore   +4 more
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Equivalence of structure constants in non-Kolmogorov and Kolmogorov spectra

Optics Letters, 2011
We find the equivalence of the structure constants in non-Kolmogorov and Kolmogorov spectra in a turbulent atmosphere. As the reference point, the spherical wave scintillation index in a non-Kolmogorov medium is used. Relations of the structure constants are found to be functions of the power law of the turbulence spectrum and the Fresnel zone. It will
Yahya, Baykal, Hamza, Gerçekcioğlu
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