Технологія і техніка друкарства (Oct 2022)
Digital Algorithms Polarization-Holographic 3D Layered Mapping of Microscopic Images of Polymere Films in Polygraphic Production
Abstract
Scientific work presents systematized data of original experimental research of diagnostic efficiency of multiparametric (using polarizing mathematical fourth order — Stokes vector) layer-by-layer three-dimensional laser Stokes-polarimetric coordinate digital mapping of a series of microscopic polarization-filtered images of coordinate distributions of random values of parameters of azimuth (the plane angle of oscillation of the laser electric intensity vector) and ellipticity (eccentricity of the laser coherent electric intensity vector trajectory) of a set of optically anisotropic diffuse samples, in which multiple interaction of laser radiation and optical inhomogeneities takes place. Analytical description of the Stokes polarimetry method using digital holographic reconstruction of layer-by-layer distributions of fields of complex amplitudes of the object field of laser radiation by means of discrete phase scanning and the inverse Fourier transform algorithm is given. The optically inhomogeneous with partial depolarization layers of optically anisotropic polyethylene films of two types — high density (control group 1) and low density (research group 2) — have been used as experimental objects. Sets of coordinate distributions of azimuth and ellipticity of polarization in a series of digital microscopic images of polyethylene films of both groups have been obtained. Statistical analysis has been used as an analytical tool in the data processing. It is based on computation of a set of 1stand 4th order statistical moments that characterize polarization maps of polarization azimuth and ellipticity. A set of diagnostic relationships between the mean, variance, skewness and kurtosis which characterize the algorithmically reconstructed maps of azimuth and polarization distributions microscopic images of polymer films.
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