An atmospheric neon plasma jet in air driven by pulse-wave-modulated sinusoidal high voltage

Summary form only given. Recently, an atmospheric pressure plasma jet (APPJ) has been attracting significant attentions, due to its non-thermal mechanisms and corresponding effects, especially its wide applications in biomedicine^[1]. An atmospheric neon plasma jet modulated by pulse wave generator is presented in this paper. The plasma jet device is a simple structure with a single copper electrode inserted in a quartz tube, which is placed in a syringe. The optical spectrum of the plasma plume is measured by an Ocean Optics (Maya 2000-PRO). A highspeed image intensified charge coupled device(ICCD) camera is used to take pictures of the plasma plume under different band filters. Two narrow band filters, with a center wavelength of 585nm and 640nm respectively, are used to shield other radiations in the discharge. A photo-sensor amplifier is used to observe the emissions with time of the jet device. The variations of both the plasma jet length and the excitation and emission characteristics of N2 and Ne, are investigated varied with the applied voltages, the gas flow rate, the duty ratio and the driving frequency of the modulating pulse wave generator. The experimental results showed that the intensity relations of the different types of emissions change with the applied voltages. The gas flow rate, the duty ratio and the frequency of the pulse wave generator will change the plasma plume´s shape and intensity. Compared to Ne(640nm) emission, Ne(585nm) emission is more concentrated to the area with high neon mole fraction. Neon plasma jets differ from helium and argon plasma jets in air in a way.