Study of Atmosphereic Penetration Factors for Near Infrared Laser Beam Performing as a Carrier Data in Free Space Rainy Atmospheric Conditions

Abstract

In this research, a calculation of optical pass length of connecting system using laser in the location of the research is done depending on the correction of Passman and Larmore. Then, the changing of spectrum passing coefficients (atmosphere penetration) for absorption as a function of the thickness of condensed water, the changing of spectrum passing coefficients for scattering as a function of sight extent, the changing of scattering factor for the rainy weather as a function of the rainfall rate, and the changing of penetration at rainy weather as a function of the rainfall rate were studied. Finally, the changing of the whole atmospheric penetration as a function of the rainfall rate was studied. The outcomes have shown the importance of both condensed water as a factor with a main effect on the atmosphere attenuation which is resulted from absorption and the aerosol and rain as factors with an effect on the laser beam attenuation according to the scattering concept.