Emittance And Reflectance Spectroscopy PDF Download

"The remote characterization of intimately mixed and layered media is a complicated and yet critical aspect of understanding the natural and human activities that induce the mixing and layering of surface media. The study of this environment is aided by two Hapke models that attempt to address these challenges in the context of reflectance spectroscopy. The Hapke mixing model predicts the spectra of intimate mixtures based upon end member spectra and known geophysical parameters but has not been evaluated over a wide range of non-powder mixtures which are common in littoral environments. The Hapke model for the diffusive reflectance of layered media can be used to predict the physical thickness of the radialith, but has undergone limited validation. Laboratory experiments characterized the spectra of mixtures composed of silica, olivine and calcium carbonate mineral sands of varying grain sizes and mass fractions. The reflectance and emissivity of sample mixtures and their component end members were measured. The measured mixture spectra and model predicted mixture spectra were compared. Prior experiments have shown the Hapke mixing model to predict reflectance spectra for fine grain (