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Prof. Dmitry Kiesewetter
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Academic Career Length
17Years (2010-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
DKDmitry Kiesewetter
Dmitry KiesewetterSKSergey Krivosheev
Sergey KrivosheevSMSergey Magazinov
Sergey MagazinovVMVictor Malyugin
Victor MalyuginSVSergey V. Varzhel
Sergey V. Varzhel
Nurzhigit Smailov +2
The pulsed elongation of fiber Bragg gratings is considered in order to be used to measure the displacement or deformation rate of objects. Optimal measurement modes were determined, numerical simulation of the output signal was performed during pulsed elongation or compression of the fiber grating, and the main patterns were analyzed. The results of the application of the Bragg gratings for the experimental determination of the deformation rate of materials under pulsed magnetic action are presented. Experimentally obtained and theoretical dependencies are compared. The dependencies of the change in the grating parameters—the coefficient and the half-width of the reflection spectrum with successive shortening of the grating—are given.
Journal Article
Nurzhigit SmailovSKSauletbek Koshkinbayev
Sauletbek KoshkinbayevYTYerlan Tashtay
Yerlan Tashtay
Ainur KuttybayevaRARimma Abdykadyrkyzy
Rimma AbdykadyrkyzyCSChangsen Sun
Changsen Sun +5
The results of applications of various methods for measuring the parameters of high-speed loading using a strain gauge, a fiber Bragg grating located on a metal measuring rod and an interferometer monitoring the movement of the free boundary of the end of the rod are presented. Numerical simulation confirmed the adequacy of the description of the shock-wave process according to experimental data and showed that, with the thickness of the adhesive layer fixing the fiber Bragg grating and the strain gauge on a dimensional rod up to 100 µm, the deformation parameters of the sensors correspond to the parameters of the stress–strain state of the rod. Experimentally, a good correspondence of the results of measuring the magnitude of the relative deformation at a pulse duration of 10–100 µs using sensors of various types is shown, and an estimate of the limit values of the measured values of the deformation wave parameters is given.
Journal Article
Nurzhigit SmailovSKSauletbek Koshkinbayev
Sauletbek Koshkinbayev
Aidana BazarbayAinur KuttybayevaYTYerlan Tashtay
Yerlan TashtayCSChangsen Sun
Changsen Sun +6
The work is devoted to the consideration of methods for determining the strain of objects using fiber Bragg gratings under a high-frequency vibration or pulsed mechanical action, which is difficult to perform using widespread methods and devices. The methods are based on numerical processing of the time dependence of the radiation power reflected from the fiber Bragg grating at various wavelengths, which makes it possible to measure strain parameters in a wide range of magnitude and frequencies. The efficiency of the proposed methods is demonstrated by numerical simulation. It is shown that it is possible to restore the strain dependence on time in the range or more from simultaneously measured power dependencies reflected by the fiber Bragg grating using common fiber-optic components. The case of sequential registration of reflected radiation power at different wavelengths to determine the probability density of the distribution of the strain values is also considered. The results of signal processing obtained both by numerical simulation and experimentally for the case of a linear vibration are presented. The technical problems of using the proposed methods are discussed.
Journal Article
DADmitry Arsenyev
Dmitry ArsenyevSDSimon D. Dubitsky
Simon D. DubitskyDKDmitry Kiesewetter
Dmitry KiesewetterVMVictor Malyuin
Victor MalyuinNumerical simulation of polypropylene laminated paper insulation is a serious challenge, as it must take into account the layered structure and presence of longitudinal and radial gaps in the coils of the winded tape for cables with sector-shape conductive cores. Thus far, it has been performed only with serious simplifications. We propose a technique for numerical modeling of electric parameters in this type of insulation by reducing a complex 3D problem to a simplified 2D model that takes into account the main influencing factors. The results of modeling the distribution of electric field strength and current density in insulation are presented, and the influence of the location of gaps between the edges of winded tape on the conductivity of cable insulation is estimated. Analytical expressions are obtained for estimating the electrical resistance of insulation while taking into account the parameters of the butt gap between the insulating tapes. The results of calculations, numerical modeling, and experimentally measured values of electrical resistance are compared, showing that there is a good match. The main effects affecting the properties of polypropylene laminated paper insulation are described.
18 September 2013 in Optics and Spectroscopy
Journal Article
DKDmitry Kiesewetter
Dmitry KiesewetterASA. Yu. Savina
A. Yu. Savina
VLV. M. Levin
V. M. Levin
GBG. G. Baskakov
G. G. Baskakov
The fluorescence decay constant of a fluorescent polymer optical fiber is measured by two different side illumination methods. Comparative analysis of these methods is performed. It is shown that the difference in the measured parameters is caused by different conditions of energy exchange between the core, cladding, and radiation modes of the fiber waveguide.
About Me
Dmitry Kiesewetter was born in Saint Petersburg (former Leningrad), Russia, in 1960, and graduated from Peter the Great St. Petersburg Polytechnic University (former Leningrad Polytechnic Institute) in 1983. He received a Ph.D. degree from Peter the Great St. Petersburg Polytechnic University in 1989. He has been a Professor with the electromechanical faculty since 2013 and an IEEE member since 2016. His fields of interest are electric and fiber-optic cables, numerical simulation of physical phenomena, optical measurements, electrical materials (dielectrics, polymers and conductors), and the development of radio-electronic equipment and software. He has published more than 200 scientific articles and four textbooks for students, participated in more than 75 scientific conferences, and participated in research, design and technological projects. In particular, he participated in the development of computer programs for image processing, the development and manufacture of measuring equipment for use in high-voltage technology, the creation of the new State Standard for power electrical cables with impregnated paper insulation, the creation of the set of programs for studying the operation of the SNR radio receivers, and the research of modern dielectric materials.