Power measurement for an atmospheric pressure plasma jet at different frequencies: distribution in the core plasma and the effluent

Abstract

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.

Investigation of Power Transmission of a Helium Plasma Jet to Different Dielectric Targets Considering Operating Modes

“…While the dissipated power at the counter electrode seems to rise constantly, a saturation or limitation seems to occur at the discharge inside the capillary. Our previous investigation showed a similar saturation in the 'core' discharge in a different geometry at about 1 W [6]. In the present setup, the limit is between 130 mW and 160 mW depending on the dielectric target.…”

“…To consider power losses, the power measurement was performed also without plasma ignition P 0 by switching off the helium flow. The calculations were comparable with [6]:…”

“…In the present setup, the limit is between 130 mW and 160 mW depending on the dielectric target. One interpretation is a saturation of the charge accumulation on the dielectric capillary resembling a geometrical limitation [6]. Another reason for the limitation could be the additional induced electric field by the deposited charged that generates a second discharge channel (#3' in Figure 3).…”

“…A broad range of investigations consider the application of plasma treatment of surfaces aiming to coat, decontaminate or heal specific surfaces. However, the diagnostics of the devices were performed while operating without a target in front [5][6][7].…”

Concept for Improved Handling Ensures Effective Contactless Plasma Treatment of Patients with kINPen® MED

“…The maximum ROS density was measured directly in the visible effluent [6,31]. In this area, a violet effluent was formed around the blue argon part, whereby the effluent consisted mainly of an ionized ROS environment [32,33]. Additionally, it is well known that a low leakage current occurs at the contact area of the effluent with the starch-potassium iodide plates [34].…”