红外与毫米波学报2012，Vol.31Issue(6)：528-535,8.DOI:10.3724/SP.J.1010.2012.00528
一种顾及表面间多次散射的热辐射方向性模型
A directional thermal radiance model for multiple scattering over surfaces
摘要
Abstract
The multiple scattering effect between heterogeneous non-isothermal surfaces is described rigorously using the configuration factor in engineering thermophysics. Based on the results a directional thermal radiance model is built, and the numerical calculation of the model is discussed. The model is integrated with the gap probability model and applied to a row structure to simulate the change of Directional Brightness Temperature (DBT). The results show that the modeled DBT agrees well with the observed DBT, especially under the condition that the gap probability is very low. It is also shows that the DBT is aggrandized because of the multiple scattering effects, whereas the change of DBT tend to average out. The temperature difference, spatial distribution, emissivity of the components can all lead to the change of DBT. That is to say, the higher of the temperature difference, the craggier of the surface and the lower of the emissivity, the more exquisite DBT changes along with the viewing zenith. The model developed in this paper can explain " hot spot effect" of thermal radiance, and it is confirmed that the existence of " hot spot" is mainly related to the spatial distribution of components'temperature. This model can be used for the study of directional effect on emissivity, the LST retrieval over urban areas and the adjacency effect of thermal remote sensing pixels.关键词
热辐射方向性/多次散射/角系数/行结构/热点效应Key words
directional thermal radiance/multiple scattering/configuration factor/row structure, hot spot effect分类
信息技术与安全科学引用本文复制引用
赵利民,顾行发,余涛,万玮,张伦,谢燕华..一种顾及表面间多次散射的热辐射方向性模型[J].红外与毫米波学报,2012,31(6):528-535,8.基金项目
"十二五"民用航天技术预先研项目 （）
"十一五"民用航天技术预先研项目 （）
科技部国际科技合作计划项目(2010DFA21880) （2010DFA21880）
