Quantitative analysis in diffuse reflectance spectrometry: A modified Kubelka-Munk equation

Abstract The behaviour of the Kubelka-Munk equation with particle size is analysed by using mono-disperse polystyrene particles. Based on the experimental results a model is proposed to explain the diffuse reflectance spectra of powdered samples in a quantitative manner. The new model explains quantitatively the behaviour of the diffuse reflectance spectra of mono-disperse polystyrene particles in KBr. Furthermore, the results show that the model can be used to explain the diffuse reflectance spectra of mixtures of mono-disperse polystyrene spheres in KBr and of a coal sample mixture containing a distribution of particle sizes and KBr. It appears that the proposed model can be used for dilute samples in a quantitative manner.

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