Abstract
The characterization of electrical power distribution in an atmospheric pressure plasma jet operated at six different frequencies is investigated by measurement of input power and voltage-charge plots for the core plasma and the plasma in the effluent. The frequency change is further characterized by measuring the temperature in the effluent at different positions and input power levels. The power input into the core plasma is limited to about 1 W for a wide range of frequencies while the total input power and thus the power input into the effluent increases continuously with frequency.
Highlights
The characterization of electrical power distribution in an atmospheric pressure plasma jet operated at six different frequencies is investigated by measurement of input power and voltage-charge plots for the core plasma and the plasma in the effluent
Cold atmospheric pressure plasma jets cover a wide range of potential applications, e.g., plasma medicine, where these devices offer a high potential for therapeutic use [1]
The pictures of the “effluent” in Figure 2a were acquired for five different plasma power values from 1.7 W to 2.6 W according to equation (3)
Summary
Cold atmospheric pressure plasma jets cover a wide range of potential applications, e.g., plasma medicine, where these devices offer a high potential for therapeutic use [1]. While the basic research on biological effects in this field is well established, the physics of the plasma sources itself must be well understood in order to explain the treatment effects and to address safety issues [2,3]. In the case of plasma jets, the “effluent” that interacts with the surface is not identical with the “core” plasma in the ignition zone. A discharge is formed between the electrodes and afterward emitted with a high electric field in form of a bullet into the surrounding air and onto the target [5,6,7,8]. One important value for the comparison of different plasma sources is the input power [9,10,11,12,13]
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