The Improvement Of Art Based Tomographic Algorithm And Its Simulation In The Reconstruction Of Atmospheric Distribution

In recent years,the air pollution is more and more serious.People gradually pay attention to the space-time distribution of the air and start to monitor the exhaust gas from the factory.The study of gases is very important in atmospheric monitoring.For example,the common photochemical smog,large-area acid rain,greenhouse effect and other phenomena are all caused by the over standard of some trace gases in the atmosphere,so it is very important to monitor and study the atmospheric distribution.In this paper,MAX-DOAS technology is combined with the tomographic reconstruction algorithm to reconstruct the atmospheric concentration distribution.ART algorithm is one of the main algorithms to detect the two-dimensional distribution of the reconstructed atmospheric concentration.This algorithm is simple and easy to implement,but the selection of the optimal relaxation factor of ART algorithm is not very good.In this paper,based on the traditional ART algorithm,an improved art algorithm is proposed to optimize the relaxation factor,and the improved algorithm is applied to the Shepp Logan head model and the simulation experiment of atmospheric detection.Finally,it is applied to the spatial distribution reconstruction of NO₂.In this paper,MAX-DOAS software is used to retrieve the concentration of NO₂ and formaldehyde.Aiming at the optimization of relaxation factor in ART algorithm,a scheme of CRRT based on simulated annealing principle is proposed.Then,the simulation experiment of Shepp Logan head model is carried out by CRRT algorithm.After analyzing and processing the relevant experimental results,the experimental results show that the effect of the improved reconstruction algorithm is better than that of the traditional ART algorithm.Then the improved ART algorithm and the traditional ART algorithm are used to reconstruct the two-dimensional spatial distribution of smoke plume.The two algorithms are analyzed by numerical simulation,and the reconstruction errors of the two algorithms are compared.The results show that the reconstruction error of the improved art algorithm is smaller than that of the traditional ART algorithm.The reconstruction effect is better than the traditional ART algorithm.Finally,the concentration of NO₂ detected by MAX-DOAS is combined with CRRT algorithm to reconstruct the distribution.Experiments show that CRRT algorithm can achieve good reconstruction results.