Application of Kubelka-Munk theory of diffuse reflectance to geologic problems - The role of scattering

Physics – Optics

Scientific paper

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Absorptivity, Diffuse Radiation, Geometrical Optics, Light Scattering, Photogeology, Planetary Surfaces, Reflectance, Monochromatic Radiation, Near Infrared Radiation, Normal Density Functions, Particle Size Distribution

Scientific paper

An understanding of the reflectance spectra of scattering media is vital for the appropriate interpretation of the reflectance spectra of planetary surfaces. When the absorption coefficient (k) and the mean size of the scattering centers are small, the Kubelka-Munk (K-M) theory of diffuse reflectance is valid. Since small values of k are characteristic of a wide variety of geologically important materials over a significant range of wavelength, the K-M theory should be applicable to appropriate portions of the reflectance spectra of these media if the dimensions of the scattering centers are sufficiently small. To test the utility of the K-M theory, a comparison is conducted of a set of theoretically generated spectra with a set of independently measured experimental spectra. The similarities found in the behavior of the two sets of spectra demonstrate the applicability of the K-M theory to the understanding of physical phenomena. Aspects of wavelength-dependent scattering are investigated.

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