科研之友
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摘要
The scattering and absorptive characteristics of the cenosphere to monochromatic light were studied by Monte Carlo ray tracing method. The reflection, refraction and absorption model of the cenosphere were built by geometrical optical approximation under specular and diffuse reflection assumptions. Validation of the model was made by comparing absorptive data from ray tracing model and that from Mie theory, and results show that when kappa < 0.01 and chi > 80, the difference between these two models is no more than 5%. The influences of the size parameter chi and optical constants m on the radiation characteristics were studied and discussed, and the scattering phase function of the cenosphere under both reflection models were calculated and plotted. The radiation characteristics of the cenosphere are related to the reflection model at the interface. Under specular reflection model, the scattering of the cenosphere is preferentially forward, while the proportion of backward scattering under diffuse reflection model is much larger. Under specular reflection, the scattering albedo rises monotonically with the increase of n. And as the particle becomes larger, the peak of the internal volumetric absorption gradually moves from inner part of the medium to outer layer. Under diffuse reflection model, the scattering albedo changes non-monotonically with the variation of n and the distribution of the volumetric internal absorption is non-monotonic with the minimum value locating in the middle part of the medium.
- 出版日期2012-7
- 单位北京大学
