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Proceedings Paper

High-speed optical studies of the long sparks in very transient stages
Author(s): Yuri V. Shcherbakov; Vitaly B. Lebedev; Vladimir A. Rakov; Grigori G. Feldman; Boris N. Gorin; Vladimir S. Syssoev; Maksim A. Karpov
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Paper Abstract

High-speed optical studies of different stages of the long sparks have been carried out at the High Voltage Research Center (HVRC), Istra, Russia, using up to three devices operated synchronously: two novel universal streak and framing cameras K004M and K008 developed by the BIFO Company and an analog image converter streak camera of FER14- type instrumented with a CCD readout system of SU04-type. Special attention was paid to the improved spatiotemporal resolution when recording the pictures of large sizes. The measurements were conducted in rod-to-plane gap of 5.5÷6 m in length under both polarities HV pulses of 2÷3 MV in altitude with waveform of 20/7500 and 100/7500 μs. Under negative polarity, an additional thin metallic rod about of 1 m in length was placed on the grounded plane to provide an origin of the positive upward leader and its reliable observation. The velocity of approaching the downward negative streamer-leader system and upward positive leader toward each other near the junction point has been found to be around 5÷10 m/μs. Some supporting exemplary pictures have been recorded to additionally clarify the phenomenology of the stepped or/and attempted leaders, which can be useful for analysis of long spark and lightning treeing and development.

Paper Details

Date Published: 29 January 2007
PDF: 9 pages
Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62795D (29 January 2007); doi: 10.1117/12.725386
Show Author Affiliations
Yuri V. Shcherbakov, All-Russian Electrotechnical Institute (Russia)
Vitaly B. Lebedev, BIFO Co. (Russia)
Vladimir A. Rakov, Univ. of Florida (United States)
Grigori G. Feldman, BIFO Co. (Russia)
Boris N. Gorin, BIFO Co. (Russia)
Vladimir S. Syssoev, All-Russian Electrotechnical Institute (Russia)
Maksim A. Karpov, BIFO Co. (Russia)


Published in SPIE Proceedings Vol. 6279:
27th International Congress on High-Speed Photography and Photonics

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