"Reflectance spectroscopy measures the light reflected by the
sample surface, which contains a specular component and a
diffuse component. Specular reflectance, described by Fresnel’s
law, contains little information about composition; consequently,
its contribution to measurements is minimized by
adjusting the detector’s position relative to the sample. On the
other hand, diffuse reflectance, which is described by the
Kubelka–Munk theory,36 is the basis for measurements by this
technique."
(Critical Review
Near-infrared spectroscopy in the pharmaceutical
industry
M. Blanco*, J. Coello, H. Iturriaga, S. Maspoch and C. de la Pezuela
Analyst, August 1998, Vol. 123 (135R–150R))
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