Variation Law of Mineral Emissivity Spectra with Mineral Granularity and Emission Angle Based on Hapke Model
YAN Bo-kun
CHEN Wei-tao
WANG Run-sheng
YANG Su-ming
SUN Wei-dong
CHEN Jian-ming
Abstract：One of basic issues in thermal infrared remote sensing geology is the variation law of mineral emissivity spectra with mineral granularity and emission angle, and the law is required when several kinds of ground information are retrieved such as temperature, emissivity and mineral. However, the law is still unknown because it is difficult to measure the mineral emissivity spectra in the laboratory. In this experiment, emissivity spectra of quartz, muscovite and anorthite are calculated using Hapke radiative transfer model, and the calculation results are compared with measured spectra. Finally, the variation law of mineral emissivity spectra with granularity and emission angle is summarized, and the problem of Hapke emissivity model is analyzed. Research results show that, Hapke radiative transfer model could be used to simulate minerals emissivity spectral and variation, and some fine spectral features are different from measured spectral probably owing to Hapke model hypothesis in which multiscattering radiation is isotropic. The variation of spectral with granularity is complicated and the variation law is different to different minerals. The common law is that, with the increase of granularity, reststrahlen features strengthen, reststrahlen features and wavelength change, and Christensen features remain stable. With increase of emission angle, emssivity becomes low-er, reststrahlen and transparency features become more obvious, and the whole spectral feature and wavelength of some features such as transparency, reststrahlen and Christensen features keep stable.
Keywords：emissivityi mineralinfrared spectroscopy.
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 946-954 )