Study of atmospheric pressure plasma jet parameters generated by DC voltage driven cold plasma source

In this work, plasma and discharge parameters of a DC voltage driven cold plasma source were measured. The device exhibits a plasma jet with a length of 3 cm and a pulsation frequency of about 2.75 kHz. The peak current of each pulse was about 1.1 mA, and the duration was about 5 μs. The repetition rate could be increased by raising the DC voltage level. By utilizing the microwave scattering system, electron density in the plasma was measured to be about ∼1011 cm−3. Vibrational and rotational temperatures of atmospheric pressure plasma jets were also measured by optical emission spectroscopy. The vibrational temperature was measured to be 2850 K and rotational temperature to be 300 K at the applied voltage of 5 kV. No strong dependence of the temperatures was found with the DC voltage level.