RADIATIVE CHARACTERIZATION OF SEMITRANSPA RENT SCATTERING MEDIA USINGA 4-FLUX MODEL

The aim of this work is the characterization of semi-transparent scatt ering media. Spectral and bidirectional devices, operating in the visi ble and infrared regions, provide transmission and reflection measurem ents. The hemispherical properties are computed by integration of BRDF and BTDF measurements. This characterization also requires a simple r adiative model, according to the experimental conditions, such as the use of lasers, collimated beams or integrating spheres. Indeed, the fo ur-flux model is enough to determine the absorption and scattering coe fficients and to approximate the phase functions, using parametrical f ittings. Results for spectralon, zircon ceramics and silicate fibrous samples are presented. These media appear to have definitely anisotrop ic phase functions.