Navegando por Assunto "Eletricidade atmosférica"

Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Análise de sensores de descargas atmosféricas: protótipo de um detector de raios com estimativa de densidade de raios para região amazônica utilizando PSoC
(Universidade Federal do Pará, 2014-02-24) LEAL, Adônis Ferreira Raiol; ROCHA, Brigida Ramati Pereira da; http://lattes.cnpq.br/9943372249006341
This work proposes the design of a prototype for detect lightning, which will, count the number of lightning detected, calculate the density of lightning to the area of operation of the sensor and to estimate the peak of the variation of the electric field for the instant occurrence of discharge. A study of atmospheric electricity, types of lightning, emission of electromagnetic waves during the occurrence of the lightning , types of electromagnetic sensors and lightning detection networks gave subsidy to the design of the prototype . The prototype consists of two antennas, one loop antenna and a flat plate antenna , and electronic circuits , these electronic circuits are implemented mostly in PSoC device ( Programmable System -on - Chip ) , which is a relatively new technology that works with analog and digital signals and also has a CPU to perform the processing of these signals . The validation of the data obtained and estimated coverage area of the sensor, were based on data from STARNET network (sferics Timing And Ranging NETwork). The prototype was designed to be low cost, have a simple and straightforward interface and can be installed in the Amazon region.
Acesso aberto (Open Access)
Elementos de sensores de eletricidade atmosférica
(Universidade Federal do Pará, 2010-05-18) PEREIRA, Carlos Simões; ROCHA, Brigida Ramati Pereira da; http://lattes.cnpq.br/9943372249006341
The electromagnetic environment surrounding the planet Earth has a fundamental role in the preservation and development of the living creature, and perhaps the last frontier of human knowledge to be dominated completely, before we ventured to the space outside in search of new opportunity outside. This environment is only now being tamed and best known, and this endeavor has as lynch pin the use of appropriate sensors that can detect and quantify these electrical effects, to serve as a basis for the generation of theories, to explain the underlying phenomena, including in this, the sensors of atmospheric electricity. This work intends to make a comprehensive analysis of these sensor’s systems of atmospheric electricity in use today, evaluating their models of operation, its limitations and its intelligence, and producing a summarized basic specifications for development of better sensors and setting standards for metric types of the variables to be measured, to cope with the currents and future demands in this field of knowledge. Additionally, the processes involved in the calibration of these sensors will be addressed with a review of computational model based on the method of moments (MoM) and other that my be used for evaluation of electromagnetic fields emitted by remote charges patterns and electrical currents, which serve to support and basis for these calibrations.
Acesso aberto (Open Access)
Planejamento de sistemas de proteção contra descargas atmosféricas para unidades habitacionais de baixa renda
(Universidade Federal do Pará, 2014-02-24) SANTOS, Diego Guimarães dos; ROCHA, Brigida Ramati Pereira da; http://lattes.cnpq.br/9943372249006341
This research have the purpose to realize a study about the lightning occurrence profile over the municipalities of Belém, Ananindeua and Marituba, in the period of 1991 to 2011 with the objective to establish the lightning occurrence profile in these municipalities, as well as identify what kind of factors need to be observed and/or identified with the finality to realize an appropriate planning of protection systems against lightning in low income housing builded by the acceleration program of development from the federal government, more precisely in Taboquinha housing, located on the district of Cruzeiro in Icoaraci. After the realization of the comparative analysis with lightning occurrence data proceeding from the lightning detection network STARNET, lightning occurrence data from LIS sensor installed on board of the TRMM satellite, as well as lightning data acquired by the Brazilian Association of Technical Standards NBR 5419, it was possible to conclude that the Taboquinha housing need an appropriate protection system against lightning due to sinister occurrence records involving direct incidence of atmospheric discharges, as well as your secondary effects. In the end of this research will be presented some discussion topics related with some conclusions about the lightning occurrence profile in the present region presented by the NBR 5419 standard, because this incoherent conclusion may harm the public patrimony, as well as the common citizen and their construction.
Acesso aberto (Open Access)
Um simulador para avaliação da influência das características locais das descargas atmosféricas nuvem-solo em sistemas de detecção indireta
(Universidade Federal do Pará, 2017-01-10) SHINKAI, Ricardo de Andrade; ROCHA, Brigida Ramati Pereira da; http://lattes.cnpq.br/9943372249006341
The monitoring of the phenomenon of atmospheric discharges has been fundamental to prevent incidents in the infrastructure of companies that operate in large areas, such as energy, telecommunications and information technology. In addition, it provides data for the planning of lightning protection systems, thus avoiding further damage to life on Earth, and more recently providing information for weather warning systems such as short-term storm forecasting. Therefore, it is no longer a matter of choice, but rather the need to install and maintain systems that supervise these events on a local, regional and even national scale. Among the possible types, the Lightning Location Systems are the ones that provide more accurate information in the mentioned scales, because they work with the perception of the electromagnetic impulse generated by the lightning. This signal has the property of propagating at medium and long distances in certain frequency bands, maintaining good the information quality of the phenomenon that originated it. However, the phenomenological characteristic of the lightning is intrinsic to the monitored area, making fundamental the understanding of these specificities to better benefit the mentioned systems. This work presents a computational tool to simulate the influence of local characteristics on the propagation of electromagnetic waves caused by cloud-to-ground lightning. The methodology was used to simulate the propagation of these waves through the MATLAB® program, using as model of return current in the discharge channel the model of engineering type the Transmission Line (TL) to represent the electric phenomenon generated by thelightning.