Atmospheric-pressure plasma

The Paschen-minimum condition at atmospheric pressure can be reached at a gap spacing of considerably less than a millimeter, at which point a few hundreds of volt should be the DC voltage needed for the gas breakdown.

Dielectric barrier discharge (DBD) is one of the main ways to produce low-temperature plasmas in a non-equilibrium condition at atmospheric pressure.

[4][5] Additionally, there have been reports stating that the Atmospheric-pressure glow discharge, when powered by a low-frequency (10-100 kHz) source, needs a dielectric barrier on one side of the electrodes to ensure stable and consistent operation.

A process gas, usually oil-free compressed air flowing past this discharge section, is excited and converted to the plasma state.

The jet head determines the geometry of the beam, and is at earth potential to hold back potential-carrying parts of the plasma stream.

Manufacturers use plasma jets for, among other things, activating and cleaning plastic and metal surfaces to prepare them for adhesive bonding and painting.

[11] Depending on the required treatment performance, the plasma source is moved at a spacing of 10–40 mm and at a speed of 5–400 m/min relative to the surface of the material being treated.