Cohen class time-frequency mapping in the analysis of the non-stationary parameters of a wave gaussian beam at the atmospheric path output

T. I. Arsenyan; E. A. Babanin; A. V. Blank; R. F. Stryungis; N. A. Suhareva

doi:10.1117/12.2504659

13 December 2018 Cohen class time-frequency mapping in the analysis of the non-stationary parameters of a wave gaussian beam at the atmospheric path output

T. I. Arsenyan, E. A. Babanin, A. V. Blank, R. F. Stryungis, N. A. Suhareva

Author Affiliations +

Proceedings Volume 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 108332Q (2018) https://doi.org/10.1117/12.2504659
Event: XXIV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2018, Tomsk, Russian Federation

Abstract

The experimental results of the time-frequency maps structure research are presented. The maps were received on the basis of Cohen class square mapping, particularly, using Wigner-Ville pseudo-distribution. Quasi synchronous monitoring of the atmospheric channel conditions and of a beam intensity spatial distribution is realized by means of the high-speed cameras of computer vision. The cameras record dynamics of a profile intensity distribution of a single-mode collimated signal beam at the receiving plane and that of the reflected sounding multimode beam. At an input of the long distance atmospheric path there comes the generalized Gaussian signal beam with the defined Rayleigh length and wavefront curvature. At the path output the spatial moments of the beam from the zero to the fourth orders are registered. The spatial moments allow to describe in details beam distortions along the propagation path with the temporary resolution not less than 1 ms.

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T. I. Arsenyan, E. A. Babanin, A. V. Blank, R. F. Stryungis, and N. A. Suhareva "Cohen class time-frequency mapping in the analysis of the non-stationary parameters of a wave gaussian beam at the atmospheric path output", Proc. SPIE 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 108332Q (13 December 2018); https://doi.org/10.1117/12.2504659

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KEYWORDS

Time-frequency analysis

Signal processing

Atmospheric propagation

Gaussian beams

Associative arrays

Refractive index

Beam propagation method

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