Variation Law of Mineral Emissivity Spectra with Mineral Granularity and Emission Angle Based on Hapke Model
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摘要: 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.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 lower, 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.
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Key words:
- emissivity /
- mineral /
- infrared spectroscopy
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图 1 石英发射光谱特征(据Melissa and Christensen, 1996修改)
Fig. 1. Emissivity features of quartz
图 2 石英计算光谱与ASU光谱库中实测光谱的对比
Fig. 2. Comparison of calculated quartz emissivity and ASU emissivity
图 4 白云母计算光谱与ASU光谱库中实测光谱对比
Fig. 4. Comparison of calculated muscovite emissivity and ASU emissivity
图 5 计算的不同粒度白云母的发射光谱
Fig. 5. Calculated muscovite emissivity of different granularities
图 6 钙长石计算光谱与ASU光谱库中实测光谱对比
Fig. 6. Comparison of calculated anorthite emissivity and ASU spectral emissivity
图 7 计算的不同粒度钙长石的发射光谱
Fig. 7. Calculated anorthite emissivity of different granularities
表 1 石英的分散度参数
Table 1. Dispersion parameters of quartz
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