紫外光大气辐射传输特性研究

张海良; 贾红辉; 张学骜; 王晓峰; 常胜利

doi:doi:10.3788/cjl200936s2.0108

中国激光, 2009, 36 (s2): 108, 网络出版: 2009-12-30

紫外光大气辐射传输特性研究

Research of the Ultraviolet Radiation Transfer in the Atmosphere

论文大纲

张海良 ^*贾红辉张学骜王晓峰常胜利

作者单位

国防科技大学理学院,湖南长沙 410073

散射紫外光大气辐射劈裂法离散坐标 scattering ultraviolet atmosphere radiation splitting method discrete ordinate

摘要

采用网格划分法对含多次散射项的紫外辐射传输方程的求解方法进行了研究。在空间上进行网格划分,网格节点在空间的辐射强度用相应的权值离散到有限的方向Ω上,根据给定的发射源参数以及初始条件和边界条件,采用劈裂法进行高效率、高精度的求解。在每一时间步长内,分别计算源项和传输项的贡献。通过Laplace变换分别求解偏微分方程的解析解来求出每一步的贡献,然后求出下一时刻的值。将用网格划分法求解的结果与Monte-Carlo方法计算的结果进行对比:用前者所花的时间要比通过后者计算所花的时间短,前者计算最大误差为6.9%。

Abstract

The solution method of ultraviolet propagation function involved multiple scattering through grid generation is investigated. Through curring up many spatial grids in space,the radiant intensity in each spatial grid is discreted in a direction Ω using relative weight factor. According to a given emission source specification as well as the boundary condition and the initial condition,it can be resolved with high efficiency and precision through splitting method. The contributions of source-term and propagation term are calculated seperately in each period of time. By Laplace conversion,the analytical solution of partial differential equations are solred separately;the each step′s contributions can be obtained;then the value of next moment can be solved. Compared the results with that using Monte-Carlo calculation method,it saves more time by using grid generation to solve the function of ultraviolet radiation propagation,and its largest computing error is 6.9%.

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张海良, 贾红辉, 张学骜, 王晓峰, 常胜利. 紫外光大气辐射传输特性研究[J]. 中国激光, 2009, 36(s2): 108. Zhang Hailiang, Jia Honghui, Zhang Xue′ao, Wang Xiaofeng, Chang Shengli. Research of the Ultraviolet Radiation Transfer in the Atmosphere[J]. Chinese Journal of Lasers, 2009, 36(s2): 108.

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