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准确地掌握地物的比辐射率在2π空间内的变化特征是精确地利用热红外遥感技术反演地表温度的重要前提。以不同厚度不同内部结构的渤海自然平整海冰为研究对象,利用TH3102 MR型热红外成像仪测量了自然平整海冰在不同观测天顶角下(0～80°,间隔10°)的辐射亮温,并将辐射亮温转换成辐射亮度,根据辐射亮度计算了每个测量样品相对于法向比辐射率(0°观测天顶角)的相对比辐射率。结果表明,相对比辐射率基本上随着观测天顶角的增大而减小,当观测天顶角大于50°时,相对比辐射率迅速减小。自然平整海冰的厚度和内部结构并不会影响相对比辐射率的变化特征。
Accurately grasping the variation of emissivity in 2π space is an important prerequisite for the accurate retrieval of surface temperature using thermal infrared remote sensing. Taking natural flattened sea ice of different thickness and internal structure in the Bohai Sea as the research object, the radiation of natural flat sea ice under different observation zenith angles (0 ~ 80 °, 10 ° intervals) was measured by TH3102 MR thermal infrared imager Temperature, and converting the radiant brightness temperature into radiance, the relative emissivity of each measurement sample relative to the normal emissivity (0 ° zenith angle of observation) was calculated from the radiance. The results show that the relative emissivity basically decreases with the increase of the zenith angle. When the zenith angle is greater than 50 °, the relative emissivity rapidly decreases. Natural formation of sea ice thickness and internal structure does not affect the relative emissivity characteristics.