粒子譜反演算法優(yōu)化及反演誤差分析
[Abstract]:There are various sources and sizes of aerosol particles in the atmosphere, which have an important impact on ecological environment and living health. Multi-wavelength lidar can achieve high precision and wide range detection of atmospheric aerosol particle spectrum and micro-physical parameter information, but at the same time, a higher requirement for particle spectrum data inversion algorithm is put forward. In order to obtain the particle size distribution, a particle spectrum inversion algorithm is proposed in this paper. The algorithm adopts regularization theory, combines 355nm, 532nm, 1064nm extinction coefficient and backscattering coefficient to realize the particle spectrum inversion, and aims at the problem of instability of the inversion results. The optimization scheme is put forward. In this scheme, multiple sets of inversion results are averaged and the percentage interval satisfying the minimum relative error of micro-physical parameters is selected. Three typical aerosol particle spectrum distributions are simulated by using the optimized inversion algorithm. The simulation results show that the effective radius, the relative error of volume concentration is less than 10%, and the absolute error of the real part of complex refractive index is less than 鹵0.04. The virtual part error is in the range of 鹵0.005, and the inversion effect is better. On the basis of the above-mentioned optimization algorithm, the influence of the optical parameter errors of each wavelength on the inversion results is studied and analyzed. Firstly, the error of single channel is analyzed. When the same ratio of-20% / 20% error is added to the optical parameters of each channel, the inversion error of micro-physical parameters increases. 355nm, 532nm extinction coefficient error has a significant effect on the inversion results, and the error of extinction coefficient of 532nm has a significant effect on the inversion results. The backscattering coefficient is the second, and the 1064nm backscattering coefficient is the lowest. Therefore, the extinction coefficient of 355nm and 532nm should be measured accurately when inverting the parameters of microphysics. Secondly, on the basis of single channel, the influence of multi-channel error on the inversion results is analyzed. The results show that the relative error of effective radius is less than 35% when the error of 10% is introduced to different optical channels at the same time. The volume concentration varies within 30%. To some extent, these conclusions can guide the design of lidar system and evaluate the approximate range of relative error of micro-physical parameters. Finally, the optimized algorithm is used to inverse the data of the multi-wavelength lidar system in the laboratory. The experimental results show that the algorithm has a good inversion effect on the particle spectrum distribution and micro-physical parameters under different weather conditions.
【學(xué)位授予單位】:西安理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:X87;X513
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