Journal
PLASMA SOURCES SCIENCE & TECHNOLOGY
Volume 27, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6595/aab6d5
Keywords
electrical measurements; streamer; charge transfer; barrier discharge; corona; electrical current
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Funding
- MSMT of the Czech Republic [LO1411]
- Czech Science Foundation [16-09721Y]
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Electrical current measurements in corona or barrier microdischarges are a challenge as they require both high temporal resolution and a large dynamic range of the current probe used. In this article, we apply a simple self-assembled current probe and compare it to commercial ones. An analysis in the time and frequency domain is carried out. Moreover, an improved methodology is presented, enabling both temporal resolution in sub-nanosecond times and current sensitivity in the order of tens of micro-amperes. Combining this methodology with a high-tech oscilloscope and self-developed software, a unique statistical analysis of currents in volume barrier discharge driven in atmospheric-pressure air is made for over 80 consecutive periods of a 15 kHz applied voltage. We reveal the presence of repetitive sub-critical current pulses and conclude that these can be identified with the discharging of surface charge microdomains. Moreover, extremely low, long-lasting microsecond currents were detected which are caused by ion flow, and are analysed in detail. The statistical behaviour presented gives deeper insight into the discharge physics of these usually undetectable current signals.
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