1 May 1994 Image-processing analysis of discharge phenomena under nonuniform electric field in vacuum
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Proceedings Volume 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum; (1994) https://doi.org/10.1117/12.174537
Event: XVI International Symposium on Discharges and Electrical Insulation in Vacuum, 1994, Moscow-St. Petersburg, Russian Federation
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.
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H. Okubo, H. Okubo, M. Fujimori, M. Fujimori, Shingo Yuasa, Shingo Yuasa, N. Hayakawa, N. Hayakawa, Masayuki Hikita, Masayuki Hikita, } "Image-processing analysis of discharge phenomena under nonuniform electric field in vacuum", Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); doi: 10.1117/12.174537; https://doi.org/10.1117/12.174537
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