Non-thermal Atmospheric Pressure Plasma Jet Operated in Krypton and Argon: Visual Characterisation of Discharge using High-speed Camera
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| Year of publication | 2014 |
| Type | Conference abstract |
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| Description | Plasma filament instabilities have been visualised using high-speed (HS) camera (REDLAKE MotionXtra HG-100K, repetition rate of 10 000 frames per second) in a radio-frequency (RF) capillary nonthermal atmospheric pressure plasma jet (ntAPPJ [1, 2]). Only the RF power (27.12 MHz, 14-90 W) and the gas flow have been varied; the outer capillary of the ntAPPJ has been fed with argon (flow rate between 600-1200 sccm), or with krypton (flow rate of 50-600 sccm). HS images are compared with long-exposure photographs of the active plasma zone (exposure time 6 ms, Panasonic Lumix FZ 100). This study reveals the wide variety of filamentary discharge structures present and describes the occurrence of striations, which occur mostly during transitions between stable modes (see mode diagram for krypton). Image processing has been used to unveil the complex behaviour of contracted filaments, both in time and space; particularly splitting of the laments. Moreover, other observed phenomena are highlighted, especially moving striations and bifurcations. |
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