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Proceedings Paper

Image-processing analysis of discharge phenomena under nonuniform electric field in vacuum
Author(s): H. Okubo; M. Fujimori; Shingo Yuasa; N. Hayakawa; Masayuki Hikita
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Paper Abstract

We observed the discharge type under non-uniform field in vacuum for air and He gas. In order to quantitatively discuss the change of the discharge type, we introduced an image processing method. In the first place, we newly proposed 4 shape parameters to characterize the discharge pattern: the area SH, the flatness rate H/V, the location G of the center of gravity for the luminous area, and the length L of the positive column. The analysis with the image processing for air revealed that SH, H/V and G continuously increased as the pressure decreased. Consequently, the discharge type in air was successfully classified into 3 regions with two boundary pressures 200 and 2000 Pa over the pressure range from 1.3 X 104 Pa. We also analyzed the discharge type in He gas in the same way. We newly introduced another parameter: effective current density Je which was defined as a ratio of the discharge current to the luminous area viewed from the vertical direction. Je proved to be independent of the discharge current Id, so that we suggested the possibility that Je can be a universal parameter to classify the discharge type for non-uniform electric field in vacuum.

Paper Details

Date Published: 1 May 1994
PDF: 6 pages
Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994);
Show Author Affiliations
H. Okubo, Nagoya Univ. (Japan)
M. Fujimori, Nagoya Univ. (Japan)
Shingo Yuasa, Nagoya Univ. (Japan)
N. Hayakawa, Nagoya Univ. (Japan)
Masayuki Hikita, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 2259:
XVI International Symposium on Discharges and Electrical Insulation in Vacuum
Gennady A. Mesyats, Editor(s)

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