Atmospheric-Pressure Plasma

Atmospheric-pressure plasma (normal pressure plasma) is plasma in which the pressure approximately matches that of the surrounding atmosphere – the so-called normal pressure. Atmospheric-pressure plasmas have prominent technical significance because in contrast with low-pressure plasma or high-pressure plasma no reaction vessel is needed to ensure the maintenance of a pressure level differing from atmospheric pressure. Accordingly, depending on the principle of generation, these plasmas can be employed directly in the production line. The need for cost-intensive chambers for producing a partial vacuum as used in low-pressure plasma technology is eliminated. Various forms of excitation are distinguished:

  • AC (alternating current) excitation
  • DC (direct current) and low-frequency excitation
  • Excitation by means of radio waves
  • Microwave excitation

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