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Applied Optics

Applied Optics


  • Vol. 24, Iss. 3 — Feb. 1, 1985
  • pp: 388–395

Reflectivity of natural and powdered minerals at CO2 laser wavelengths

John E. Eberhardt, John G. Haub, and Arthur W. Pryor  »View Author Affiliations

Applied Optics, Vol. 24, Issue 3, pp. 388-395 (1985)

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The diffuse reflectance and depolarization properties of natural and powdered minerals were examined at 128 CO2 laser wavelengths. Powder reflectivity was classified into three regimes: (1) surface (reststrahlen); (2) low intermediate; and (3) bulk (Kubelka-Munk) remission from subsurface grains. Data are presented on NaCl, Al2O3, MgO, BaCO3, CaCO3, BaSO4, feldspar (NaAlSi3O8), and apatite [Ca5F(PO4)3]. Reduction of feldspar rocks to 210-μm grain size had little effect on their reflectance spectra. Kubelka-Munk-type behavior seems unlikely to dominate the reflectance spectra of natural surfaces. Albedos were measured for NaCl, sulfur, gold-plated sandpaper, graphite, and sandblasted aluminum.

© 1985 Optical Society of America

Original Manuscript: August 1, 1984
Published: February 1, 1985

John E. Eberhardt, John G. Haub, and Arthur W. Pryor, "Reflectivity of natural and powdered minerals at CO2 laser wavelengths," Appl. Opt. 24, 388-395 (1985)

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  1. J. E. Eberhardt, A. A. Green, J. G. Haub, R. J. P. Lyon, A. W. Pryor, “Mid-Infrared Active and Passive Remote Sensing Systems and their Application to Geology and Mineral Exploration,” presented at International Geoscience and Remote Sensing Symposium, San Francisco, 31 Aug.–2 Sept., 1983.
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  18. Ref. 16, p. 437, Fig. 18.
  19. Ref. 16, p. 369, Figs. 16.1 and 16.2.
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