Features of optical diffusion diagnostics in structure characterization of the foamed polymers
Various approaches to optical diffusion characterization of growing polymer foams as a specific version of multiple scattering random media with a high level of disorder are considered. These approaches include the diffuse reflectance and transmittance measurements, low-coherence reference-free and reference-based reflectometry, and full-field multi-speckle correlometry. The relationship between the key parameter of the optical diffusion diagnostics such as the transport mean free path of probe light propagation in foams and the structure properties of polymer foams are discussed. A probable influence on the optical inversion effect under the wet-to-dry transition in the expanding polymer foams on the diagnostic parameters is taken into account.
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