Computer Optics

181-186

Authors: R.V. Skidanov, S.V. Ganchevskaya

We proposed an algorithm for calculating the DOE forming vortex beams with a preset distribution of minima and maxima. We reviewed several versions of this algorithm. We presented the calculation of some configurations of traps to capture transparent and non-transparent micro-objects.

211-217

Authors: S.V. Karpeev, S.N. Khonina, S.I. Kharitonov

A dispersive element in the form of the diffraction grating on a convex mirror surface is investigated. The groove profile of the grating is measured and the intensity distribution between the diffraction orders is calculated as a function of wavelength for the visible spectrum. Optomechanical elements for the required alignments of the spectrometer elements are designed and fabricated. Adjustment of a prototype optical scheme is implemented and point images for three monochromatic incident wavelengths are obtained. The energy distribution between the diffraction orders and the intensity maxima positions are in agreement with the simulation results.

370-375

Authors: P.A. Semenov, S.D. Pol’skikh

Phase-locking system based on the Gerchberg-Saxton algorithm is discussed. A global optimization strategy for retrieving phase information is proposed. The system reduction block-structure method is considered. The system is simulated numerically for different configurations of phased channels.

420-428

Authors: O.V. Mandrikova, E.A. Zhizhikina

This paper describes a method developed by the authors for estimating the state of the geomagnetic field. The method is based on the combination of wavelet transform with radial basis neural networks. The method includes decomposing of recorded geomagnetic field variations on different scale components, estimating their disturbance degree and forming conclusion about the state of the field. For approbation of the method, we used geomagnetic data from the “Paratunka” station (Paratunka, Kamchatka region, data registration is carried out by IKIR FEB RAS). The analysis of the spectral-temporal characteristics of geomagnetic field variations during periods of moderate and strong magnetic storms was performed. Weak perturbations were detected in the geomagnetic field before the storms. Obtained results confirmed the effectiveness of the proposed method.

529-535

Authors: G.I. Greisukh, E.G. Ezhov, S.V. Kazin, S.A. Stepanov

The chromatic correction of the optical systems consisting of the elements manufactured by compression molding, are investigated. The discovered advantages are demonstrated.

592-599

Authors: R.V. Eruslanov, M.N. Orehova, V.N. Dubrovin

This article presents the method of solving the problem of segmentation of the retroperitoneal space organs from the tomographic images; the method bases on the level set function. The method of image pre-processing is based on the nonlinear anisotropic diffusion filter which smooths the image while maintaining the edges between the segments. The segmentation algorithm of tomographic image based on the level set function are synthesized.

635-643

Authors: I.M. Sizova

A method for the approximation of encircled energy in a definite solid angle in the Fraunhofer zone by the simulation of optical transfer function derivative is proposed. The selection of free model parameters allow one to obtain true expansion of encircled energy in the origin of the angle coordinate and at infinity, and good approximation in intermediate domain.

728-737

Authors: A.Kh. Sultanov, I.L. Vinogradova, I.K. Meshkov, A.V. Andrianova, G.I. Abdrakhmanova, A.A. Ishmiyarov, L.Z. Yantilina

It’s proposed to connect radio antenna array in Radio-over-Fiber light guide line through the special optical device, which provides splitting the optical signals in accordance with defined frequency bandwidths. The field calculation inside the device working body is done.