Relations Among Kubelka-Munk Coefficients and Absorption and Scattering Coefficients of Powders.

摘要

The use of the Kubelka-Munk (KM) theory to predict absorption and scattering coefficents of powders from values of diffuse reflectance of an incident radiation beam is shown to lead to errors of 20% or less, for realistic model powders. The use of a conventional plausible relation to predict imaginary refractive index from absorption coefficient is found to produce errors of the order of 200%. Methods for correcting these errors are discussed. A new radiative transfer equation is derived and analyzed for applications to close-packed strongly absorbing or strongly reflecting media. For such media, the new equation predicts reflectances and transmittances which are significantly different from those predicted by the standard transfer equations. (Author)