The electrical, optical and energetic efficiency characteristics of an asymmetrical surface dielectric barrier discharge (DBD) in atmospheric air have been investigated experimentally. Voltages in the range of 18-29 kV and 18-22 kHz frequencies were applied to the DBD system, producing filamentous and diffuse discharges on the surface of a glass dielectric. These discharges reached peak currents up to 4 mA. In terms of energetic efficiency, the system obtained minimum power 5 W required to produce plasma diffuse regime. The best conditions in the system were found for the distance between electrodes 0.8 mm.Keywords: Dielectric barrier discharge; Plasma applications; Plasma devices; Atmospheric plasma. ReSumoAs características elétricas, ópticas e de eficiência energética de uma descarga de barreira dielétrica (DBD) com eletrodos assimétricos em ar atmosférico foram investigadas experimentalmente. As tensões na faixa de 18-29 kV e frequência de 18-22 kHz foram aplicadas ao sistema DBD, produzindo descargas filamentosas e difusas na superfície de um dielétrico de vidro. Essas descargas atingiram correntes de pico até 4 mA.Em termos de eficiência energética, o sistema obteve potência mínima de 5 W necessária para produzir um regime difuso de plasma. As melhores condições do sistema foram encontradas para a distância entre eletrodos de 0,8 mm Palavras-chave: Descarga de barreira dielétrica; Aplicações de plasma; Dispositivo de plasma; Plasma em pressão atmosférica.
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