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Puro A.E.,Institute of Informatics and Computer Machines
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2014

Optical polarization tomography of the tokamak plasma magnetic field is considered in the context accepted for large magnetic fields. Two models of the interaction between the magnetic field and radiation are studied: (1) the Faraday rotation (FR) of the polarization plane is imposed on birefringence caused by the toroidal component and (2) the Cotton-Mouton effect (CME) is imposed on the FR. Previously, these problems were solved with allowance for only one of the optical effects. New integrals caused by the amplification of the magnetic field are added to ray integrals used earlier. The retrieval of the magnetic field is based on the vector Radon transform (VRT) of imaginary absorption. Formulas of the inverse VRT are derived using generalized conditions from R. Novikov on the Radon transform with absorption. © 2014 Pleiades Publishing, Ltd. Source


Puro A.E.,Institute of Informatics and Computer Machines
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2014

A method for determining residual stresses in elongated transparent blanks of hexagonal single crystals the optical axis of which is directed along the crystal is proposed. It is assumed that the residual deformation tensor is of thermal character and is characterized by a fictitious temperature. Characteristic parameters of polarized light have been measured by the tomographic method in the plane orthogonal to the single crystal axis. © Pleiades Publishing, Ltd., 2014. Source


Puro A.E.,Institute of Informatics and Computer Machines | Karov D.D.,Saint Petersburg State Polytechnic University
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2014

Algorithms for determining residual stresses in glass round waveguides by the method of integrated photoelasticity are considered. It is assumed that the residual deformation tensor is of thermal character and is characterized by fictitious temperature varying over the sample. The reconstruction is based on measuring characteristic parameters of polarized light and is carried out by the tomographic method in the plane orthogonal to the waveguide axis. © 2014, Pleiades Publishing, Ltd. Source


Puro A.E.,Institute of Informatics and Computer Machines
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2013

As initial data, optical polarization tomography of tensor and vector fields uses ray integrals the values of which are determined from polarization measurements. Most algorithms of integrated photoelasticity are based on the linear approximation of the solution of the birefringence equations. In this work, the approximation of smooth rotation of quasi-principal axes of the polarization tensor is proposed for use in approximating values of ray integrals. © 2013 Pleiades Publishing, Ltd. Source


Puro A.E.,Institute of Informatics and Computer Machines | Karov D.D.,Saint Petersburg State Polytechnic University
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2015

A way to determine residual stresses in cylindrical trigonal single crystals the optical axis of which is directed along the crystal axis is proposed. It is assumed that the residual deformation tensor is of thermal character and is characterized by fictive temperature. The measurements are performed in the middle part of a single crystal the length of which is much larger than its diameter; therefore, the stresses in this part do not vary along the single crystal axis. The reconstruction of stresses is based on determining characteristic parameters of polarized light by use of the tomographic method in the plane orthogonal to the single crystal axis. © 2015, Pleiades Publishing, Ltd. Source

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