Vol. 7, issue 05, article # 5

Patrushev G. Ya. Time characteristics of the intensity and flux fluctuations of a spherical wave reflected from specular objects in the turbulent atmosphere. // Atmospheric and oceanic optics. 1994. V. 7. No. 05. P. 321-324.    PDF
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Abstract:

This paper deals with an analysis of time structure of the fluctuations of the intensity and flux of a spherical wave reflected from a specular disc of large diameter and from a spatial array of closely packed ground–based corner–cube reflectors for strong intensity fluctuations. Based on the experimental data, it is shown that temporal variations in the intensity and flux of radiation caused by variations in the average and fluctuation components of the wind velocity on a path can be accounted for by introducing an effective drift velocity of the optical inhomogeneities across the propagation path. In the case of reflection from a specular disc the interval of time correlation of the fluctuations is proportional to the square root of D, where D is the diameter of a receiving aperture, while the position of the spectral power density maximum is inversely proportional to this guantity. In the case of reflection from an array of corner–cube reflectors, the temporal spectra of the intensity fluctuations are less sensitive to the intensity of turbulence on the path, and their high–frequency portion is more pronounced as compared to that in the case of reflection from a specular disc.