1. Spectral determination of a two-parametric phase function for polydispersive scattering liquids
- Author
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Tobias Lindbergh, Marcus Larsson, Tomas Strömberg, and Ingemar Fredriksson
- Subjects
Optics ,Materials science ,business.industry ,Scattering ,Mie scattering ,Monte Carlo method ,Calibration ,Diffuse reflection ,business ,Atomic and Molecular Physics, and Optics ,Collimated light ,Light scattering ,Spectral line - Abstract
A method for determining a two-parametric Gegenbauer-kernel phase function that accurately describes the diffuse reflectance from a polydispersive scattering media at small source-detector separations (0.23 to 1.2 mm), is presented. The method involves spectral collimated transmission measurements, spatially resolved spectral diffuse reflectance (SRDR) measurements, and inverse Monte Carlo technique. Both absolute calibration (using a monodispersive polystyrene microsphere suspension) and relative calibration (eliminating differences between fibers) of SRDR spectra yielded comparable results. When applied to water dilutions of milk, simulated and measured spectra deviated less than 6.5% and 2.5% for the absolute and relative calibration case, respectively, even for the closest fiber separation. Corresponding values for milk including ink as an absorber, were 13.4% and 7.3%.
- Published
- 2009