Electron density measurements in an atmospheric pressure argon discharge by means of plasma radiation

Bing Qi; Jianjun Huang; Liang Gao; Yunming Qiu
August 2009
Physics of Plasmas;Aug2009, Vol. 16 Issue 8, p083301
Academic Journal
A method is developed for measuring the electron density in argon during atmospheric pressure dielectric barrier discharge. The oscillating electromagnetic signal is detected by an antenna at a distance from the plasma source. The electron density is then calculated from the ion oscillation frequency. The results show that the electron density in the plasma after the turnoff of the discharge channel is 2.55×1019 m-3 with an applied voltage of 2.73 kV, and it decays almost exponentially down to 1.00×1019 m-3 over 49.2 ns. The electron density is found to increase linearly with increasing voltage.


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