Results 171 to 180 of about 31,732 (215)

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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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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Causes of non-Kolmogorov turbulence in the atmosphere

Applied Optics, 2016
In the present work, we briefly describe a model for atmospheric turbulence energy on the basis of experimental data obtained in Siberia. A series of new studies is considered and the results of our long-term experimental observations are summarized. The results of these studies form the basis for an explanation of some effects in interactions between ...
V P, Lukin, E V, Nosov, V V, Nosov, A V, Torgaev   +3 more
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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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Optical propagation in non-Kolmogorov atmospheric turbulence

SPIE Proceedings, 1995
Several observations of atmospheric turbulence statistics have been reported which do not obey Kolmogorov's power spectral density model. These observations have prompted the study of optical propagation through turbulence described by non-classical power spectra.
Bruce E. Stribling, Byron M. Welsh, Michael C. Roggemann   +2 more
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Phase compensation in non-Kolmogorov atmospheric turbulence

Optik, 2014
Abstract Zernike polynomial decompositions are used for investigating phase distortion induced by atmospheric turbulence in optical systems. Closed-form expression of the Zernike-coefficient variances is derived. The finite size of the receiver aperture is analyzed using the filter function which is also particularly effective in the theoretical ...
Hua Tang, Pengzhan Guo
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Non-Kolmogorov’s and Kolmogorov’s Solitonic Hydrodynamical Turbulence

Imaging and Applied Optics 2014, 2014
The experimental spectrums for the non-Kolmogorov’s and Kolmogorov’s turbulence are presenting as a sums of spectrums of several coherent structures. Therefore the coherent structure (soliton solution of the hydrodynamic equations) is the basic structural element of turbulence.
V.V. Nosov, P.G. Kovadlo, V.P. Lukin, E.V. Nosov, A.V. Torgaev   +4 more
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Imaging and communications through non-Kolmogorov turbulence

SPIE Proceedings, 2009
At present, system design usually assumes the Kolmogorov model of refractive index fluctuation spectra in the atmosphere. However, experimental data indicates that in the atmospheric boundary layer and at higher altitudes the turbulence can be different from Kolmogorov's type.
Norman S. Kopeika, Arkadi Zilberman, Ephim Golbraikh   +2 more
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Karhunen–Loeve functions for non-Kolmogorov turbulence

Journal of Turbulence, 2017
ABSTRACTKarhunen–Loeve functions for the case of non-Kolmogorov turbulence are calculated. The calculations are performed using the covariance matrix of Zernike coefficients which is derived in analytical form. It is shown that the Karhunen–Loeve expansion is more efficient than the Zernike one for simulations of high-order, turbulence-induced phase ...
Valeri Orlov, Valeri Voitsekhovich
openaire   +1 more source