Accession Number : AD0772843

Title :   Laser Scintillation Properties in the Marine Boundary Layer.

Descriptive Note : Master's thesis,


Personal Author(s) : Schroeder,Arthur Frederick , Jr

Report Date : DEC 1973

Pagination or Media Count : 85

Abstract : Intensity scintillation was studied for a He-Ne (6328A) laser beam propagating over a 4.05 kilometer horizontal path in the marine boundary layer. The results fall in three areas. (1) The covariance of the logarithm of the laser beam amplitude increases significantly with decreasing detector aperture diameter for apertures less than the first Fresnel zone size. This effect appears to be dependent on the magnitude of the refractive index structure constant, (C sub N). (2) The dependence of CN on (height) to the (-4/3) power for unstable meteorological conditions was verified using the laser beam in determining (C sub N). (3) Frequency anaoysis performed on scintillation data indicates that the increase of power in higher frequencies is more dependent on the wind velocity perpendicular to the propagation path than on detector aperture diameter for apertures smaller than the first Fresnel zone size. (Author)

Descriptors :   *Light transmission, *Marine atmospheres, Laser beams, Helium neon lasers, Scintillation, Turbulent boundary layer, Theses

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE