Browsing Приборы и методы измерений by Title

Now showing items 51-70 of 483

    • Er,Yb:Ca3RE2(BO3)4 (RE=Y, Gd) – Novel 1.5 μm Laser Crystals 

      Gorbachenya, K. N.; Deineka, R. V.; Kisel, V. E.; Yasukevich, A. S.; Shekhovtsov, A. N.; Kosmyna, M. B.; Kuleshov, N. V. (БНТУ, 2019)
      The search for new crystalline host materials for the usage in lasers emitting in the eye-safe spectral range of 1.5–1.6 μm is an important task. The aim of this work was to study the growth technique, spectroscopic properties and laser characteristics of new active media – crystals Er3+,Yb3+:Ca3RE2(BO3)4 (RE=Y, Gd). Calcium-yttrium Er3+,Yb3+:Ca3Y2(BO3)4 (CYB) and calcium-gadolinium ...
      2019-03-15

    • Evaluation of Nonuniformity of Elastic Properties of Sheets Made from Closed-Сell Polyolefin Foams by Acoustic Method 

      Bogdan, O. P.; Zlobin, D. V.; Muraveva, O. V.; Molin, S. M.; Platunov, A. V. (БНТУ, 2021)
      The widespread use of polyolefin foams in strategically important industries is due to their high thermal, sound and vibration insulation properties. The aim of the work was to evaluate the non-uniformity of elastic properties over the area of sheets of polyolefin foams of various types using the acoustic non-contact shadow amplitude method of testing and confirmation by the ...
      2021-03-18

    • Evaluation of the Magnet Breakaway Force Measurement Accuracy of the NT-800 Sensors for Early Detection of Defects of Their Manufacturing 

      Kutsepau, A.; Kren, A.; Hnutsenka, Y. (БНТУ, 2021)
      Сontrol of mechanical stresses formed with the deposition of nickel coatings plays an important role in the diagnosis of coatings’ technical condition. Large internal stresses can lead to cracking or flaking of coatings which is completely unacceptable for critical parts and assembly units used, for example, in space technology for which reliability is of paramount importance. ...
      2021-10-18

    • Evaluation of the Magnet Breakaway Force Measurement Accuracy of the NT-800 Sensors for Early Detection of Defects of Their Manufacturing 

      Kutsepau, A.; Kren, A.; Hnutsenka, Y. (БНТУ, 2021)
      Сontrol of mechanical stresses formed with the deposition of nickel coatings plays an important role in the diagnosis of coatings’ technical condition. Large internal stresses can lead to cracking or flaking of coatings which is completely unacceptable for critical parts and assembly units used, for example, in space technology for which reliability is of paramount importance. ...
      2021-10-15

    • Expanding of Excimer Laser Photoablation’s Functionality in Ophthalmology 

      Alekseev, V. A.; Kostin, V. G.; Usoltseva, A. V.; Usoltsev, V. P.; Yuran, S. I. (БНТУ, 2021)
      One of the significant weaknesses of excimer laser-based vision correction devices is the difficulty of achieving a required change in the refractive properties of the cornea to sharply focus the image on the retina with distance from the working area (ablation zone) center to the periphery due to a change in the laser beam incidence angle. The study is aimed at improving the ...
      2021-10-14

    • Experimental Installation for Determination of Attenuation Coefficient of Permanent Magnetic Field by Protective Materials 

      Fedosyuk, V. M. (БНТУ, 2021)
      The permanent magnetic field in addition to electromagnetic radiation has a significant effect on performance of devices. This is particularly true for highly sensitive precision measuring equipment, such as, for example, magnetometers or photomultiplier tubes. In this regard a new high-performance materials for protection against permanent fields and electromagnetic radiation ...
      2021-03-18

    • Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals 

      Skazochkin, A. V.; Bondarenko, G. G.; Zukowski, P. (БНТУ, 2020)
      One of the important characteristics of the surface properties of metal parts subjected to friction is hardness. Hardness measurements are important for determining the operational characteristics of parts and monitoring the technological regimes of surface modification. However, hardness measurements of thin modified layers made by different methods can lead to differences in ...
      2020-09-18

    • Features of Аpplication of a Сombined Аpproach to the Еvaluation of the Мeasurement Results Uncertainty 

      Serenkov, P. S.; Hurevich, V. L.; Тоlochko, Т. К. (БНТУ, 2020)
      The article exposes description of features of the combined approach application to the evaluation of measurement results uncertainty. The aim of this work is the justification and development of new science-driven approaches to achieve maximum efficacy of measurements on the criteria "accuracy/costs" at the stated level of confidence. It provides theoretical base for correctness ...
      2020-03-17

    • Frequency Domain Diagnostics of Transformer Insulation 

      Gutten, M.; Sebok, M.; Korenciak, D.; Brncal, P.; Kubis, M.; Zukowski, P.; Koltunowicz, T. N. (БНТУ, 2019)
      The first part of paper deals with the base information about diagnostics of power transformers. In this part are presented differently insulating methods, for example method of recovery voltage method, method of polarization and depolarization currents and chromatographic analysis. The second part of paper deals use of method of frequency domain spectroscopy for oil power ...
      2020-01-08

    • Gamma-spectrometer for water areas and bottom sediments radiation monitoring 

      Zhukouski, A.; Anshakou, A.; Biryla, A.; Chyrykala, U.; Kanavalau, Y.; Nichyparchuk, A.; Savitski, A.; Khrutchinsky, A.; Kutsen, S. (БНТУ, 2016)
      In order to solve the problem of continuous or periodic monitoring of water areas affected by radioactive contamination in the result of scheduled emissions in nuclear power plants or in the result of emergency situations in nuclear fuel cycle plants we need to develop measurement instruments with advanced mathematics and program support to assess the level of radioactive ...
      2016-12-12

    • High Power Diode-Pumped Erbium Laser Emitting at Near 1.5 μm 

      Gorbachenya, K. N.; Kisel, V. E.; Yasukevich, A. S.; Koporulina, E. V.; Volkova, E. A.; Maltsev, V. V.; Leonyuk, N. I.; Kuleshov, N. V. (БНТУ, 2021)
      Solid-state lasers emitting in the 1.5–1.6 μm spectral range are very promising for eye-safe laser range finding, ophthalmology, fiber-optic communication systems, and optical location. The aim of this work is the investigation of spectrosposcopic and laser properties of gain medium based on borate crystal for abovementioned lasers. Spectroscopic and laser properties of ...
      2021-07-06

    • High Power SESAM Mode-Locked Laser Based on Yb3+:YAlO3 Bulk Crystal 

      Rudenkov, A.; Kisel, V.; Yasukevich, A.; Hovhannesyan, K.; Petrosyan, A.; Kuleshov, N. (БНТУ, 2020)
      Yttrium aluminium perovskite YAlO3 (YAP) crystal, doped with rare-earth ions, has been extensively studied as a diode-pumped laser host material. The wide interest to rare-earth ions doped YAP crystals is explained by its good thermal and mechanical properties, high natural birefringence, widely used Czochralski growth method. The aim of this work was to study the Yb3+:YAlO3 ...
      2020-09-18

    • High-efficiency infrared receiver 

      Esman, A. K.; Kostenko, V. I.; Mukhurov, N. I.; Zykov, G. L.; Potachits, V. A. (БНТУ, 2016)
      Исследования и разработки последних лет показывают перспективность использования высокоэффективных твердотельных приемников электромагнитного излучения на основе низкобарьерных диодов Шоттки. Особенно активно развивается подход к конструированию приемников на основе δ-легированных низкобарьерных диодов Шоттки с балочными выводами без смещения, так как для неохлаждаемых приемников ...
      2016-09-11

    • High-Frequency Capacitor with Working Substance "Insulator–Undoped Silicon–Insulator" 

      Poklonski, N. A.; Anikeev, I. I.; Vyrko, S. A. (БНТУ, 2022)
      The study of the parameters of capacitors with various working substances is of interest for the design and creation of electronic elements, in particular for the development of high-frequency phase-shifting circuits. The purpose of the work is to calculate the high-frequency capacitance of a capacitor with the working substance insulator undoped silicon insulator at different ...
      2022-12-29

    • Holographic visualization of cylindrical piezoceramic transducers vibrations 

      Vasiliauskas, R.; Ragulskis, K.; Patašienė, L.; Fedaravičius, A. (БНТУ, 2013)
      The piezomaterial used in cylindrical piezoceramic transducers vibrations requiring high precision displacements indicates that accuracy depends on design and technological factors. The analyzed criteria have made possible to choose the piezomaterial for optimal mechatronic system having a maximal displacement. The experimental investigation of precision vibrosystems by means of ...
      2014-06-02

    • Improving of Surface Quality of Metal Reflector Mirrors Machined by Single Point Diamond Turning 

      Gusakov, G. A.; Sharonov, G. V. (БНТУ, 2021)
      Improving the technology of diamond turning of aluminum alloys is of great importance for expanding the application areas of metal-optical products based on aluminum in aerospace technology. The aim of this work was to study the effect of surface inhomogeneities of the initial aluminum alloy substrates on their optical and mechanical characteristics and to determine ways of ...
      2021-07-08

    • Impulsively-Laser Excitation and Propagation of Ultrasonic Waves through Nanomagnetic Fluid 

      Baev, A. R.; Mitkovets, A. I.; Asadchaya, M. V.; Mayorov, A. L. (БНТУ, 2021)
      Magnetic fluids belong to the class of nanomaterials with a high gain of light absorption, aggregative and sedimentation stability as well as controllability by external fields, which is of interest to use in the field of optoacoustics. The purpose of the work was to experimentally study the effect of the optoacoustic transformation in a magnetic fluid, depending on the concentration ...
      2021-10-18

    • Impulsively-Laser Excitation and Propagation of Ultrasonic Waves through Nanomagnetic Fluid 

      Baev, A. R.; Mitkovets, A. I.; Asadchaya, M. V.; Mayorov, A. L. (БНТУ, 2021)
      Magnetic fluids belong to the class of nanomaterials with a high gain of light absorption, aggregative and sedimentation stability as well as controllability by external fields, which is of interest to use in the field of optoacoustics. The purpose of the work was to experimentally study the effect of the optoacoustic transformation in a magnetic fluid, depending on the concentration ...
      2021-10-15

    • In-Band Pumped Continuous-Wave Lasers Based on Ho:KY(WO4)2 Crystal and Ho:KGdYbY(WO4)2 Epitaxial Layer 

      Dernovich, O. P.; Gusakova, N. V.; Kisel, V. E.; Kravtsov, A. V.; Guretsky, S. A.; Pavlyuk, A. A.; Kuleshov, N. V. (БНТУ, 2020)
      2 μm lasers are in demand for a number of practical applications, such as environmental monitoring, remote sensing, medicine, material processing, and are also used as a pump sources for optical parametric generators. Crystals of double potassium tungstates doped with ions of rare-earth elements were shown to be promising materials both for the creation of classical solid-state ...
      2020-12-18

    • Increasing of the Accuracy of Signalsʼ Time Parameters Measuring Using Double Pulse Trains 

      Isaev, A. V.; Suchodolov, U. V.; Sushko, A. S.; Sheinikau, A. A. (БНТУ, 2021)
      In modern diagnostics, much attention is paid to measuring of time parameters, as well as their change over time. The purpose of this work is to develop a method for measuring of time intervals which made it possible to increase the measurement accuracy by reducing errors associated with the instability of main parameters of the pulse signal. In the most of approaches used, the ...
      2021-12-22