The Influences of Water and Oxygen Contents on Length of Atmospheric Pressure Plasma Jets in Ar/H2O and Ar/O2 Mixtures

Images are taken to study the influence of applied voltage and O
₂
or H
₂
O vapor content on discharge evolution and jet length of atmospheric pressure plasma jet in Ar/O
₂
and Ar/H
₂
O mixtures. Three discharge modes of corona, dielectric barrier discharge, and jet with the increase of applied voltage are identified, and the breakdown voltage and jet generated voltage are different for O
₂
and H
₂
O adding. The jet length decreases with the increase of O
₂
and H
₂
O content, and this may be due to their quenching effect on excitation and ionization particles.