草原枯萎植物的热红外偏振特性研究

为了探究草原枯萎植物的热红外偏振特性，根据热红外偏振的探测机理，利用热红外辐射计对草原枯萎植物样品进行室内测量，发现其热红外偏振辐射亮度、亮温都有随探测角的增大而增大、随方位角和偏振态的增大先增大后减小的趋势，需要特别说明的是虎尾草在180°方位角的亮温是先减小后增大，实验所反映的热红外偏振特性与物质的粗糙程度、探测方向、物质的内部结构及其发射能力有关，该研究为定量研究奠定了基础。

Study on the Thermal Infrared Polarization Characteristics of the Grassland Withered Plants

With the development of remote sensing technology,it is important to study on the thermal infrared polarization characteristics of the land surface objects.In order to explore the thermal infrared polarization characteristics of the grassland withered plants,the samples of the grassland withered plants were measured indoor according to the thermal infrared polarized detection mechanism,using thermal infrared radiometer.The results showed that the thermal infrared polarized radiance and brightness temperature have increased with the viewing angle and have increased first and then decreased with the azimuth and polarized state.Chloris virgata’s brightness temperature decreased first and then increased at 180° azimuth,which is an exceptional case.These reflect that the thermal infrared polarization characteristics are related to the materials’ roughness,the detecting direction,the internal structure and its emission ability,and this research laid the foundation for other quantitative studies.