Browsing Приборы и методы измерений by Title
Now showing items 48-67 of 490
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Digital Spectral Analysis by means of the Method of Averag Modified Periodograms Using Binary-Sign Stochastic Quantization of Signals
(БНТУ, 2021)The method of averaging modified periodograms is one of the main methods for estimating the power spectral density (PSD). The aim of this work was the development of mathematical and algorithmic support, which can increase the computational efficiency of signals digital spectral analysis by this method. The solution to this problem is based on the use of binary-sign stochastic ...2021-10-15 -
Digital Spectral Analysis by means of the Method of Averag Modified Periodograms Using Binary-Sign Stochastic Quantization of Signals
(БНТУ, 2021)The method of averaging modified periodograms is one of the main methods for estimating the power spectral density (PSD). The aim of this work was the development of mathematical and algorithmic support, which can increase the computational efficiency of signals digital spectral analysis by this method. The solution to this problem is based on the use of binary-sign stochastic ...2021-10-18 -
Dislocation avalanches and strain bursts in the boards of radio-engineering equipment
(БНТУ, 2013)The aim of this work is to investigate the influence of vibrations on the material of the board. For that purpose a cascade of navigation devices boards was installed on the vibrational stand. Experiments were performed in the 0,5–10 Hz vibrational diapason range; 0–3 V voltage range; 0 – +45 °C allowed temperature range. Amplitude method was applied to determine the coordinates ...2013-12-02 -
Dual Wavelength Chirped Pulse Regenerative Amplifier Based on Yb3+:LuAlO3 Crystal for Terahertz Applications
(БНТУ, 2020)Compact diode-pumped chirped pulse regenerative amplifier systems with pulse repetition rate of hundreds kilohertz based on Yb3+-doped crystals are of practical importance for wide range of applications such as materials processing, medicine, scientific research, etc. The aim of this work was to study the Yb3+:LuAlO3 crystal based dual wavelength chirped pulse regenerative ...2020-03-16 -
Dynamic Features of Spectra of Single and Quasi-Periodic Measuring Signals
(БНТУ, 2022)Solving the problems of spectral processing of single and quasi-periodic signals in measurement and diagnostic systems is directly related to their isolation against the background of external interference or noise. The purpose of this work was to study single and quasi-periodic signals, i. e. signals limited in time, presented as separate components; development of a mathematical ...2022-07-06 -
Er,Yb:Ca3RE2(BO3)4 (RE=Y, Gd) – Novel 1.5 μm Laser Crystals
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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"
(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
(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
