Research on the Influence of Fog on Laser Transmission Based on Monte Carlo Method

摘要

When the laser is transmitted in the fog, due to the scattering and absorption of the droplets, the laser energy will continue to decay, weakening the effectiveness of the laser system. In this paper, a Monte Carlo method is established to study and analyze the attenuation characteristics of laser transmission in fog. Studies have shown that as the propagation distance increases, the number of photons reaching the receiving plane decreases approximately linearly. As the visibility increases, the number of photons reaching the receiving plane slowly decreases at first, and then increases approximately linearly. As the initial root mean square (RMS) radius increases, the number of photons reaching the receiving plane does not change at first, and then increases slowly. For the photon time distribution at the receiving plane, the relationship between the photon peak time and the propagation distance is linear. In addition, studies have shown that the photon spatial distribution basically presents a Gaussian distribution. Comparing the calculation results with MODTRAN online calculation results, the relevant conclusions are basically consistent.