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Proceedings Paper

High-speed imaging system for observation of discharge phenomena
Author(s): R. Tanabe; H. Kusano; Y. Ito
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Paper Abstract

A thin metal electrode tip instantly changes its shape into a sphere or a needlelike shape in a single electrical discharge of high current. These changes occur within several hundred microseconds. To observe these high-speed phenomena in a single discharge, an imaging system using a high-speed video camera and a high repetition rate pulse laser was constructed. A nanosecond laser, the wavelength of which was 532 nm, was used as the illuminating source of a newly developed high-speed video camera, HPV-1. The time resolution of our system was determined by the laser pulse width and was about 80 nanoseconds. The system can take one hundred pictures at 16- or 64-microsecond intervals in a single discharge event. A band-pass filter at 532 nm was placed in front of the camera to block the emission of the discharge arc at other wavelengths. Therefore, clear images of the electrode were recorded even during the discharge. If the laser was not used, only images of plasma during discharge and thermal radiation from the electrode after discharge were observed. These results demonstrate that the combination of a high repetition rate and a short pulse laser with a high speed video camera provides a unique and powerful method for high speed imaging.

Paper Details

Date Published: 10 February 2009
PDF: 9 pages
Proc. SPIE 7126, 28th International Congress on High-Speed Imaging and Photonics, 71260M (10 February 2009); doi: 10.1117/12.822050
Show Author Affiliations
R. Tanabe, Nagaoka Univ. of Technology (Japan)
H. Kusano, Shimadzu Corp. (Japan)
Y. Ito, Nagaoka Univ. of Technology (Japan)

Published in SPIE Proceedings Vol. 7126:
28th International Congress on High-Speed Imaging and Photonics
Harald Kleine; Martha Patricia Butron Guillen, Editor(s)

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