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Electron Density Measurement of DC Positive Arc Propagating Over an Ice Surface Based on \hbox {H}_{\alpha } Line

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2 Author(s)
Nekahi, A. ; Dept. of Atmos. Icing of Power Network Equip., Univ. du Quebec a Chicoutimi, Chicoutimi, QC, Canada ; Farzaneh, M.

Results of spectroscopic investigation of an arc formed over an ice surface are presented. Direct-current positive voltage is applied to a flat ice surface with a 6-cm air gap to initiate electric discharge. Time-resolved spectra are taken during the propagation of arc along the surface. From the emission spectra, the profile of hydrogen-alpha from Blamer series is used to measure the electron density of the arc column. A method based on broadening of the Hα line considering instrumentation broadening is employed. The electron densities obtained by optical emission spectroscopy show an increase from 1 to 2 × 1017 cm-3 corresponding to current increase from 200 to 700 mA. The electron density at the flashover instant is calculated to be about 2.5 × 1017 cm-3.

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Plasma Science, IEEE Transactions on  (Volume:39 ,  Issue: 4 )