On the applicability of Kirchoff's law and the principle of heat balance in thermal infrared remote sensing:A non-isothermal system  

作　　者：ZHANG Renhua LI Zhaoliang SUN Xiaomin ZHU Zhilin WANG Weimin 

机构地区：[1]Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Science China Earth Sciences》2005年第1期53-64,共12页中国科学（地球科学英文版）

基　　金：This work was supported by the National Basic Research Project(Grant No.2000077900);the Key Project of the National Natural Science Foundation of China(Grant Nos.49890330 and 40371089);the Knowledge Innovation Project of Ins titute of Geographical Sciences;Natural Resources Research,Chinese Academy of Sciences(Grant Nos.CXIOG-C00-05-02 and CXIOG-E01-01-04).

摘　　要：This paper proposes a basic equation of thermal radiation interaction between surface objects on the basis of the principle of heat balance in the interface. The solution of this equation takes account of the contribution of sensible heat flux and latent heat flux more completely, compared with traditional solution for surface cooling and heating processes. By the aid of the experimental data conducted in the Xiaotangshan experimental site, Beijing, both the non-applicability of Kirchoff's law and the measurability of surface emissivity in a non-isothermal system have been highlighted. Two methods called ventilation and time-delay compensations have been proposed to reduce the error induced by change of surface temperatures of non-isothermal objects during the measurement of emissivity. Based on the solution of the basic equation, this paper has analyzed and pointed out the misunderstanding in comprehension and application of Kirchoff's law published in literature.This paper proposes a basic equation of thermal radiation interaction between surface objects on the basis of the principle of heat balance in the interface. The solution of this equation takes account of the contribution of sensible heat flux and latent heat flux more completely, compared with traditional solution for surface cooling and heating processes. By the aid of the experimental data conducted in the Xiaotangshan experimental site, Beijing, both the non-applicability of Kirchoff's law and the measurability of surface emissivity in a non-isothermal system have been highlighted. Two methods called ventilation and time-delay compensations have been proposed to reduce the error induced by change of surface temperatures of non-isothermal objects during the measurement of emissivity. Based on the solution of the basic equation, this paper has analyzed and pointed out the misunderstanding in comprehension and application of Kirchoff's law published in literature.

关 键 词：APPLICABILITY of Kirchoff's law  heat balance  NON-ISOTHERMAL system. 

分 类 号：O414.1[理学—理论物理]