论文部分内容阅读
矿物红外发射光谱随粒度与发射角的变异是热红外地质遥感中的基础性问题之一,温度与发射率反演以及矿物信息提取均需要考虑发射光谱的变异.常规实验室矿物发射光谱测量技术难度较大,限制了对矿物发射光谱变异规律的深入研究.利用Hapke岩矿辐射传输模型对石英、白云母和钙长石3种矿物的发射光谱进行了模拟,将模拟结果与实测光谱进行了对比,总结了矿物发射光谱随粒度、发射角的变异规律,分析了Hapke发射率模型存在的问题.Hapke模型可较好地模拟矿物发射光谱整体谱形与主要光谱特征及其变异规律,但在某些光谱细节上与实测光谱仍有一定差异,其原因可能是模型中矿物介质中多次散射辐射为“各向同性”的假设所致;随粒度增加,吸收特征会增强,且位置可能发生漂移;随发射角增加,发射率逐渐减小,透射特征和吸收特征逐渐增强,但光谱的整体形状和透射特征、吸收特征、克里斯琴森特征的位置与形态均基本保持不变.
The variation of infrared emission spectrum with the grain size and emission angle is one of the fundamental problems in thermal infrared geo-remote sensing. The variation of emission spectrum needs to be considered in the retrieval of temperature and emissivity and the extraction of mineral information.General laboratory mineral emission spectrometry Which is more difficult to restrict the further study on the law of spectral variation of mineral emission.The emission spectra of three minerals of quartz, muscovite and anorthite are simulated by using the Hapke rock radiation model.The simulated results are compared with the measured spectra By contrast, the law of variation of emission spectrum with particle size and emission angle is summarized, and the existing problems of Hapke emissivity model are analyzed.Hapke model can well simulate the whole spectrum shape and the main spectral characteristics of mineral emission spectrum and its variation law, Some of the spectral details are still somewhat different from the measured spectra due to the assumption that the multiple scattering radiation in the model is “isotropic” in the mineral medium; as the grain size increases, the absorption characteristics increase and the position Drift may occur. With the increase of the emission angle, the emissivity gradually decreases and the transmission and absorption characteristics gradually increase. However, the overall shape of the spectrum and Transmission and absorption features, Christianson’s position and shape are basically unchanged.