Experimental Study of the Attenuation Effect of a Laser in a Foggy Environment in an FSO System

Abstract

When a laser is transmitted in a foggy environment, the droplets floating in the air will attenuate the laser transmission. Based on Mie scattering theory, the Monte Carlo method and five common empirical models are used to analyze the transmission of a laser in a foggy environment. The transmission characteristics of the laser in a real foggy environment are measured. The atmospheric transmittance is compared with the predicted model results. The results show that the total energy attenuation of the droplet particles is approximately twice the attenuation of the scattering cross-section, and the laser attenuation in the advection fog is greater than that in the radiation fog under the same conditions. By comparing and analyzing the measured transmittance data in foggy weather and the values from the empirical prediction model, it is found that when the laser is transmitted in a foggy environment, each laser link has a corresponding empirical prediction model.