Prof. Dimitar Teodosiev Profile

Prof. Dimitar Teodosiev

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Proceedings Article | 21 September 2023 Paper

Spherical sensors with glassy carbon coatings for measurement of electric fields in near-Earth plasma on board satellites

Dimitar Teodosiev, Anna Bouzekova-Penkova, Boyko Tsyntsarski, Jordan Georgiev, Denitsa Borisova, Valentina Hristova

Proceedings Volume 12786, 1278620 (2023) https://doi.org/10.1117/12.2680612

KEYWORDS: Carbon, Satellites, Plasma, Electric fields, Spherical lenses, Sensors, Electric field sensors, Solar processes, Optical spheres, Electrodes

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The development of satellite research to study the processes in the near-Earth plasma requires improvement of the scientific equipment, measurement methods and increasing the accuracy of the obtained data. There are actual and relevant issues which worth investigation: detailed study of the energy, momentum and mass transfer processes in the critical areas of the solar wind - magnetosphere system; explore the effects of the processes taking place in the earth's crust, which cause earthquakes; the effects of magnetospheric-ionospheric plasma related to climate changes, etc. The investigation of the processes taking place in the magnetospheric-ionospheric plasma requires simultaneous multicomponent measurements of the main parameters of the space plasma, including also the electric fields, at different points of the Earth orbit, on the board of satellites. For the measurement of direct (DC) and alternating (AC) electric fields in the magnetospheric-ionospheric plasma, various methods and technologies for sensor preparation are developed and applied successfully. A method of the double probe by using an original Bulgarian technology for sealing and covering with glassy carbon of the surface of the sensitive parts of the probes, which ensures maximal accuracy of measurements of constant and alternating electric fields when working in open space, is considered. The experiments from eight satellites and one technological experiment on board the International Space Station (ISS), where these measurements were carried out, are presented. Possibilities for the application of the obtained results in the analysis of energy transfer processes in the Earth plasma and their impact on the environment are demonstrated. This work is financially supported by the Bulgarian National Science Fund under Project KP-06-N27/2 (КП-06-Н27/2), 08.12.2018.

Proceedings Article | 27 June 2019 Paper

Web-based EMF monitoring in urban environment

Lachezar Filchev, Dimitar Teodosiev, Roumen Nedkov, Denitsa Borisova, Boyan Kehayov, Ilia Iliev, Todor Tsvetkov

Proceedings Volume 11174, 111741S (2019) https://doi.org/10.1117/12.2533559

KEYWORDS: Databases, Electromagnetism, Visualization, Environmental monitoring, Data modeling, Antennas, Telecommunications, Environmental sensing, Networks, Data storage

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The development of mobile communications in the past decade imposed a real risk to human health. The ever growing technology needs and developments in the telecommunication technology are one of the environmental issues of the urban environments. One solution to accommodate the technology developments is to optimize the mobile communications network which is a topic of investigation of many scientific and technology teams. In order to optimize the network it is necessary to make regular measurements and assess the risk on human health and optimize the mobile network on the basis of software defined radio /SDR/. In European Union /EU/ and in Bulgaria are present regulations for the control of electromagnetic field /EMF/ emissions. Investigation of the EMF pollution on the territory of Sofia municipality is performed within the domain from 100 MHz to 7 GHz using standard measurement equipment, and portative field spectrometer based on SDR. The characteristics of the three spectrometers provide for a more in depth analysis of the EMF sources. The field measurements are continuous during day and nighttime. The data is stored in a personal geodatabase format (ESRI Inc., Academic license) and MySQL and stored on the FTP server of Technical University /TU/ of Sofia IT infrastructure. The data is visualized on a web-portal developed by TU team. In conclusion is analyzed the opportunities for urban developments in view of urban planning for the development of the city of Sofia in compliance with national and EU environmental legislation.

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