Revealing of major factors in the directional thermal radiation of ground objects - A new way for improving the precision of directional radiant temperature measuring and data analysis

This paper is devoted to eliminating the noise from the measuring of direct ional thermal radiation for ground objects. Specifically, we think that the noise is mainly due to the variance of components in the field of view of the sensor with the view angle changing and to the heat balance change on t he ground during the period of measurement. The authors present two new obs ervation methods named as "constant area method by thermal camera" and "con current method by dual sensors" respectively. The experiments show that the data obtained by these methods abide by some regularly directional distrib ution, which is totally different from the data from the former methods. Th e analysis of the major factors in the directionality of thermal radiation is also made in the paper.