Polygraphic Laser Tomography System and Algorithms for Computer Digital Reconstruction of the bulk Structure of Polymeric Materials

Abstract

Our scientific article presents materials that illuminate a new experimental method of polarization tomography of the polycrystalline structure of polymer phase-inhomogeneous layers. The method is based on the formalism of the vector-parametric description of laser fields using the parameters of the Stokes vector. A polycrystalline polymer layer is associated with a matrix operator (Mueller matrix), which most fully describes the polarization manifestations of optical anisotropy. Analytical algorithms have been developed that make it possible to determine the magnitude of linear and circular birefringence and dichroism from the experimentally measured coordinate distributions of the magnitude of the elements of the Mueller matrix of methyl acrylate layers. This method is generalized using the technique of polarization interferometry, which makes it possible to record layer-by-layer distributions of fields of complex amplitudes of object laser radiation. For this purpose, the methodology of digital holographic reconstruction based on the inverse Fourier transform algorithm is used. The layer-by-layer distributions of the phase and amplitude anisotropy parameters of methyl acrylate layers obtained using discrete phase scanning are analyzed within the framework of the statistical approach, which is based on the calculation of a set of central statistical moments of the 1st–4th orders, which characterize the mean, variance, asymmetry and kurtosis of maps of the optical anisotropy of methyl acrylate. The dynamics of the change in the value of the set of central statistical moments of the 1st–4th orders, which characterize the coordinate distributions of random values of the optical anisotropy parameters of the polycrystalline structure of multi-scattering layers of methyl acrylate in various ‘phase’ sections of its volume, has been studied and theoretically analyzed.

Keywords

• laser reconstruction
• optical anisotropy
• polymers
• acrylate
• diagnostics