ElAr :: Перегляд за автором "Frolova, T. I."

Перегляд за автором "Frolova, T. I."

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A High-Power Source of Optical Radiation with Microwave Excitation
(2019) Frolova, T. I.; Churyumov, G. I.; Denisov, O. G.; Wang, N.; Qiu, J.
For more than 50 years, interest to the microwave heating technology has not weakened. In addition to the traditional areas of its application, which described in detail in [1], recently there has been an expansion of technological possibilities for the use of microwave energy associated with the impact of electromagnetic waves of the microwave range on various materials (sintering of metal and ceramic powders) and media, including plasma [2]. One such new direction is the creation of high-power and environmentally friendly sources of optical radiation on the basis of an electrodeless sulfur lamp with microwave excitation [2, 3]. The purpose of this paper is to the further development of the theory and practice of microwave excitation by the electrodeless sulfur lamps, improvement the energy efficiency during energy conversion into the optical radiation and widening the application of new light sources in real practice. The results of the computer modeling of conversion process of the microwave energy into optical radiation energy are presented. The simulation results are compared with experimental data. It is shown that additional use of the solar panels for the reverse conversion of the optical radiation into DC energy with follow-up its using in the circuits of secondary power supply allows improving the energy efficiency of the light source.
Advanced design of re-entrant beam distributed-emission crossed-field tubes
(IEEE, 2000) Frolova, T. I.; Churyumov, G. I.; Gritsunov, A. V.; Terehin, S. N.
The computed and measured results for re-entrant beam, distributed emission, crossed-field tubes are presented. The computer modelling is carried out by a particle-in-cell method (PIC method) in quasi-periodic, single-mode and non-relativistic approximations. The PIC method provides an accurate means to accomplish the computer modelling of classical continuous-wave magnetron generators including the low-voltage magnetron as well as the millimeter wave magnetron. The 3D self-consistent mathematical model of the non-traditional magnetron generator (combined magnetron) is considered.
Analysis of electron-wave interaction in cathode driven crossed-field amplifiers by coupled-mode method
(1998) Frolova, T. I.; Churyumov, G. I.
In present paper the processes of electron-wave interaction in the cathode driven crossed-field amplifiers are studied. These tubes have a higher gain due to the use of the weakly coupled delay lines placed on the anode and negative electrode (cathode). As a result the r.f. signal of same frequency is applied to the input of a cathode delay line (or to the inputs of the anode and cathode delay lines) and after an amplification the signal is coming to the output of the anode delay line (the mode of cathode excitation)
Change of the emission spectrum of sulfur lamp when changing the properties of the electromagnetic field
(ХНУРЭ, 2011) Machekhin, Yu. P.; Frolova, T. I.; Shunkova, I. A.
The paper is devoted to researching the behavior of the emission spectrum of an electrodeless sulfur lamp when the parameters of the microwave field pumping a system are being changed. Some cases of changes in the magnitude and spatial position of the microwave field antinode are studied. The obtained results make it possible to control the output radiation of the lamp when parameters of the microwave field are changing and monitor the pumping energy on the basis of the emitted spectrum of the sulfur lamp.
“Chapter 5. Microwave Energy and Light Energy Transformation: Methods, Schemes and Designs”
(InTech, 2018) Frolova, T. I.; Churyumov, G. I.
Nowadays, electrodeless sulfur lamps with microwave excitation (ESLME) are finding ever-widening application in energy-efficiency lighting systems. A reason of increased interest to these lamps is due to high values of their parameters including a high light flux (120-145 klm), a light intensity (~ 9000 cd), a high value of light output (80-110 lm/W), color rendition coefficient (Ra ~ 90), as well as an application of environmentally friendly materials (argon and sulfur). This chapter presents a novel approach of creating an energy-efficiency lighting source on the basis of the ESLME. For an electrodynamic structure of the lighting system, one can propose to use an optically transparent (mesh) waveguide instead of a microwave cavity. It is shown that the use of proximity of the spectra of optical radiation generated by the sulfur lamp and solar radiation allows more efficiently (in comparison with other light sources) their application as the simulators of sunlight for testing photoelectric converters and solar cells. For extending application of the lighting systems on the basis of the sulfur lamp and further increasing an energy efficiency of these systems, their integration with other electron devices (for example, solar cells) is proposed.
Combined Solar Simulator for Testing Photovoltaic Devices
(2019) Frolova, T. I.; Churyumov, G. I.; Vlasyuk, V. M.; Kostylyov, V. P.
The paper discusses a combined solar simulator, consisting of an electrodeless sulfur lamp with microwave excitation and a halogen lamp. It is shown that the emission spectrum of such a design of the combined solar simulator is closest to the spectral distribution of solar radiation in the wavelength range of 400 ... 1100 nm and has an increased service life compared to the solar simulator based on a xenon arc lamp. The spectral irradiance data of the solar simulator based on ASTM E927-10 in the wavelength range of 400 ... 700 nm have been measured. An excellent correspondence has been found between the observed results and existing spectral distribution of sunlight in the visible optical range at the level of AM 1.5G in according to standard ASTM G173-03.
Computer modelling of the electron-wave interaction in combined magnetron
(IEEE, 2000) Frolova, T. I.; Churyumov, G. I.; Sergeev, G. I.
The classical magnetron generators are the most-used among the crossed-field tubes. Having high efficiency, low operating voltages as well as low weight, volume and cost the magnetrons are competitive tubes in the aggregate of the given parameters. Upgrading of requirements to the output parameters of the classical magnetrons as well as complication of their operating modes allowed the researchers to design new types of the magnetrons: coaxial and inverted coaxial magnetrons. These tubes have a different constructional features, but the similar mechanism of an electron-wave interaction. The basis of such a mechanism is the interaction a re-entrant electron beam with an electromagnetic field of the resonant delay line (traditional classical crossed-field systems). On the other hand there are electron-wave systems which feature the interaction of two re-entrant electronic beams with the electromagnetic field of a resonant delay line (non-traditional systems). Among the tubes of this type are the combined magnetron. In this paper the theoretical and experimental investigation results of the physical processes in the combined magnetron are discussed.
Effective Application of Plasma Lighting Facility Based on Electrodeless Sulfur Lamp for Electrical Regeneration
(45th IEEE International Conference on Plasma Science (ICOPS 2018), 2018) Frolova, T. I.
Today, due to the intensive depletion of fossil resources on Earth, there is a need to use renewable energy sources. The most interesting is the photoelectric conversion of solar energy into electrical energy. Although the Sun is the largest source of energy on Earth and supplies 99.98% of the total energy of our planet, however, the intensity and spectral distribution of its radiation depends on geographical location, climatic, weather, and seasonal conditions, etc. Therefore, in the process of our life, artificial light sources are often used. Modern light sources must satisfy a number of parameters, combining high luminous efficiency and efficiency of generated radiation (a wide range of spectral distribution and color rendering), durability and environmental friendliness with low cost and variety of applications fields.
Electrodeless sulfur lamp on the basis of microwave excitation: estimation of spectral effectiveness of radiation for bio-objects
(Applied Radio Electronics: Sci. Journ, 2018) Frolova, T. I.
The paper considers a lighting system based on an electrodeless sulfur lamp with microwave excitation for bioobjects. As a result of the intensive development of new technologies in the field of lighting equipment (LED, HID lamps, and others) it is necessary to replace outdated lighting for a more energy-efficient one, by using new modern lamps of artificial radiation for biological objects (human, animals and plants). The parameters of optical radiation sources for different biological objects are different (for humans and some animals they are based on the sensitivity of the eye (photonic response curve), for plants – it is the photon flux density of photosynthetically active radiation (PAR) from 400 to 700 nm). High-pressure sodium lamps (HPSL) and metal halide lamps (MHL) are the most common among the artificial light sources used in greenhouses. However, at present, the most effective and promising are lighting systems based on LED lamps and the electrodeless sulfur lamp with microwave excitation. The latter is environmentally friendly (it does not contain mercury), with a high efficiency of PAR (72%) and durable (above 60,000 hrs.) Analysis of the spectral efficiency of radiation showed that the electrodeless sulfur lamp with microwave excitation has a high photosynthetic photon flux density (PPFD) (1440 μmol·s-1·m-2) in an optical range of 400-700 nm.
Electrodeless sulfur lamp on the basis of microwave excitation: estimation of spectral effectiveness of radiation for bio-objectsм
(ХНУРЭ, 2018) Frolova, T. I.
The paper considers a lighting system based on an electrodeless sulfur lamp with microwave excitation for bio-objects. As a result of the intensive development of new technologies in the field of lighting equipment (LED, HID lamps, and others) it is necessary to replace outdated lighting for a more energy-efficient one, by using new modern lamps of artificial radiation for biological objects (human, animals and plants). The parameters of optical radiation sources for different biological objects are different (for humans and some animals they are based on the sensitivity of the eye (photonic response curve), for plants – it is the photon flux density of photosynthetically active radiation (PAR) from 400 to 700 nm). High-pressure sodium lamps (HPSL) and metal halide lamps (MHL) are the most common among the artificial light sources used in greenhouses. However, at present, the most effective and promising are lighting systems based on LED lamps and the electrodeless sulfur lamp with microwave excitation. The latter is environmentally friendly (it does not contain mercury), with a high efficiency of PAR (72%) and durable (above 60,000 hrs.) Analysis of the spectral efficiency of radiation showed that the electrodeless sulfur lamp with microwave excitation has a high photosynthetic photon flux density (PPFD) (1440 μmol·s-1·m-2) in an optical range of 400-700 nm.
Microwave Heating of Low-Temperature Plasma and Its Application
(IntechOpen, 2021) Frolova, T. I.; Churyumov, G. I.; Odarenko, E. N.; Gerasimov, V.; Buts, V.
In this chapter, the results of theoretical and experimental studies of the interaction of an electromagnetic field with a plasma (fundamental interaction of the wave-particle type) both in the regime of standing waves (in the case of a resonator) and in the case of traveling waves in a waveguide are presented. The results of computer modeling the distribution of a regular electromagnetic field for various designs of electrodynamic structures are considered. The most attractive designs of electrodynamic structures for practical application are determined. A brief review and analysis of some mechanisms of stochastic plasma heating are given as well as the conditions for the formation of dynamic chaos in such structures are determined. Comparison analysis of microwave plasma heating in a regular electromagnetic field (in a regime with dynamical chaos) with plasma heating by random fields is considered. It is shown, that stochastic heating of plasma is much more efficient in comparison with other mechanisms of plasma heating (including fundamental interaction of the wave-wave type). The results obtained in this work can be used to increase the efficiency of plasma heating as well as to develop promising new sources of electromagnetic radiation in the microwave and optical ranges.
Simulation of a non-linear interaction in the combined magnetron
(IEEE, 2000) Frolova, T. I.; Churyumov, G. I.
In the last few years the development of efficient crossed-field tubes has been connected with the creation of new non-traditional designs. In this paper a mathematical model of a new combined magnetron and the features of its operation modes are discussed.
Solar Simulator for Photovoltaic Devices Based on the Electrodeless Sulfur Lamp
(2018) Frolova, T. I.; Frolov, A.
At the present time, there has been an active growth in the use of solar energy, which is the most affordable renewable energy source for us. In this regard, there is a need for testing of photovoltaic cells and solar panels used to collect solar energy. In laboratory conditions, when testing photovoltaic panels, it is necessary to use solar simulators, which have very close parameters to solar radiation. The most important components of solar imitators are artificial light sources. Within this work, the reference spectral distribution of sunlight in the visible optical range at the level of AM 1.5G was shown, as defined in ASTM Gl73-03. The goal of this work is to determine the output characteristics (spectral match and spatial non-uniformity of irradiance) of the solar simulator based on ASTM E927-10 standard in the interval of 400 nm - 700 nm. As a light source of the solar simulator, a powerful electrodeless sulfur lamp with microwave excitation is used which has a continuous quasi-solar spectrum of optical radiation with a maximum at 510 nm and is very close to the solar spectrum in the visible range.
The Advanced Designs of Magnetrons with Improvement Output Characteristics
(2016) Churyumov, G. I.; Gerasimov, V.; Frolova, T. I.; Gritsunov, A. V.; Ekezli, A.
This paper presents the experimental and theoretical investigations of the two constructions of the magnetrons: the low-voltage X and Ku ranges magnetrons with two RF outputs of energy and the cold secondary emission cathode magnetron with ancillary side cold cathode. It is shown that the electronic frequency tuning in the magnetrons with two RF output can be obtained in the range more than 200 MHz. The electronic control of the frequency tuning from pulse to pulse is performed by the microwave switch on basis the p-i-n diodes. By using the computer modeling, the features of secondary emission multiplication mechanism of the electron beam at the front and droop of anode voltage pulses are shown. The prospects for developing such magnetrons and expansion of areas of their application are discussed.
The Concept of Simulation Results Display in the Research Activities And Distance Education
(УАДО, 2002) Maksimov, I. S.; Churyumov, G. I.; Frolova, T. I.; Smol’yanov, V. V.
Математическое моделирование сложных (нелинейных) физических явлений требует применения специального программного обеспечения. Данное программное обеспечение представляет собой так называемые виртуальные лаборатории (ВЛ), которые применяются для решения как научно-исследовательских задач, так и для целей образования, в том числе дистанционного. В данной работе рассматривается концепция создания ВЛ для изучения рабочих характеристик приборов со скрещенными Полями (магнетронов) Обсуждается использование подобной ВЛ в тесной интеграции с современными Internet-технологиями для решения задач дистанционного образования

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