Journal
JOURNAL OF MODERN OPTICS
Volume 67, Issue 11, Pages 974-991Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2020.1801872
Keywords
Radiative transfer; four-flux model; light scattering; simulated annealing; collimated reflection; collimated transmission
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Four-flux radiative transfer models have been extensively used to describe reflectance and transmittance (R&T) spectra of light scattering and absorbing (S&A) media. Solutions to the differential equations corresponding to the collimated fluxes are obtained by subsequent application of boundary conditions. Explicit expressions for the collimated R&T of light are reported, when considering a light S&A medium contained between two glass slides, an experimental arrangement which is appropriate for liquid suspensions and viscous matrices containing solid particles. A spectral simulated annealing method is applied to retrieve, from measured R&T spectra of collimated light under normal incident radiation, the scattering and absorption coefficients of the composite medium. First, the accuracy of the method is established by applying it to synthetic collimated R&T data. Secondly, we apply the method to experimental data and use it to determine the S&A coefficients of a layer of TiO(2)particles dispersed in a PVP/water matrix.
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