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Date of Publication:2017-01-01

Journal:中国科学 物理学 力学 天文学

Volume:47

Issue:3

Page Number:035202

ISSN No.:1674-7275

Abstract:DC glow discharges were achieved in nitrogen, argon and helium with a
   specially structured quartz tube fitted by two planar electrodes, to
   study the formation and evolution of positive column striations. By
   changing the discharge conditions such as discharge current and gas
   pressure, the striation spatial structure varied obviously and evolved
   gradually. In the paper, the gas pressure, gas flow velocity and
   discharge current were altered deliberately to study evolution of the
   striations. The luminance photos of striations were recorded by a
   scientific camera and then the luminance intensity distribution of
   striations was figured out by using self-developed image processing
   scheme to show the striation structure. The resulted striation structure
   shows perfect spatial periodicity. The striation wavelength is constant
   with constant discharge, although the luminance peaks of striations
   attenuate from cathode to anode. In view of discharge in nitrogen, the
   structure characteristics of striations (striation wavelength and
   attenuation coefficient) were investigated quantitatively by scanning
   discharge current, pressure and gas flow velocity. The results told us
   that striation wavelength risen linearly with the logarithm of the
   discharge current while it varied slightly with pressure and was hardly
   related with gas flow velocity.

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