Advanced

Spatially and temporally resolved electron density measurements in streamers in dielectric liquids

Barmann, P; Kröll, Stefan LU and Sunesson, A (1997) In Journal of Physics D: Applied Physics 30(5). p.856-863
Abstract
Spatially and temporally resolved spectroscopic measurements of light emitted from positive streamers in transformer oil are presented. Analyses of the measurements performed with a DC needle-plane gap yield electron densities and indications of the atomic excitation temperatures in the streamers. The hydrogen emission reveals an electron density below 10(16) cm(-3) during the main part of the streamer propagation time (80-90%). Later the light is also characterized by emission from a high-density plasma with electron densities in the range 10(18)-10(19) cm(-3). The electron density during this time increases approximately linearly with distance from the initiation point and a density factor of four higher has been measured at the streamer... (More)
Spatially and temporally resolved spectroscopic measurements of light emitted from positive streamers in transformer oil are presented. Analyses of the measurements performed with a DC needle-plane gap yield electron densities and indications of the atomic excitation temperatures in the streamers. The hydrogen emission reveals an electron density below 10(16) cm(-3) during the main part of the streamer propagation time (80-90%). Later the light is also characterized by emission from a high-density plasma with electron densities in the range 10(18)-10(19) cm(-3). The electron density during this time increases approximately linearly with distance from the initiation point and a density factor of four higher has been measured at the streamer tip than at the root. Measurements with high spectral resolution detect both high and low electron densities simultaneously. A tentative model of the interior of the streamer plasma, spatially resolved, is presented. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics D: Applied Physics
volume
30
issue
5
pages
856 - 863
publisher
IOP Publishing
external identifiers
  • Scopus:0031557358
ISSN
1361-6463
DOI
10.1088/0022-3727/30/5/018
language
English
LU publication?
yes
id
8e6d1624-0c74-4e08-aca1-ea0914c0158c (old id 2257416)
date added to LUP
2012-02-23 23:30:45
date last changed
2016-10-30 04:37:12
@misc{8e6d1624-0c74-4e08-aca1-ea0914c0158c,
  abstract     = {Spatially and temporally resolved spectroscopic measurements of light emitted from positive streamers in transformer oil are presented. Analyses of the measurements performed with a DC needle-plane gap yield electron densities and indications of the atomic excitation temperatures in the streamers. The hydrogen emission reveals an electron density below 10(16) cm(-3) during the main part of the streamer propagation time (80-90%). Later the light is also characterized by emission from a high-density plasma with electron densities in the range 10(18)-10(19) cm(-3). The electron density during this time increases approximately linearly with distance from the initiation point and a density factor of four higher has been measured at the streamer tip than at the root. Measurements with high spectral resolution detect both high and low electron densities simultaneously. A tentative model of the interior of the streamer plasma, spatially resolved, is presented.},
  author       = {Barmann, P and Kröll, Stefan and Sunesson, A},
  issn         = {1361-6463},
  language     = {eng},
  number       = {5},
  pages        = {856--863},
  publisher    = {ARRAY(0xb79d410)},
  series       = {Journal of Physics D: Applied Physics},
  title        = {Spatially and temporally resolved electron density measurements in streamers in dielectric liquids},
  url          = {http://dx.doi.org/10.1088/0022-3727/30/5/018},
  volume       = {30},
  year         = {1997},
}