Time-resolved characterization of a free plasma jet formed off the surface of a piezoelectric crystal
- Authors
- Yang, Jinyu; Im, Seong-Kyun; Go, David B.
- Issue Date
- 4월-2020
- Publisher
- IOP PUBLISHING LTD
- Keywords
- piezoelectric transformer; free plasma jet; streamer corona; plasma afterglow
- Citation
- PLASMA SOURCES SCIENCE & TECHNOLOGY, v.29, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- PLASMA SOURCES SCIENCE & TECHNOLOGY
- Volume
- 29
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56767
- DOI
- 10.1088/1361-6595/ab7987
- ISSN
- 0963-0252
- Abstract
- When a piezoelectric transformer (PT) is actuated by a low input voltage (similar to 10 V), electromechanical coupling leads to a very high (similar to 10(3) V) surface potential at the distal end that can ionize the surrounding gas and lead to a plasma jet emanating from the surface. PTs are attractive for non-equilibrium plasma generation because of their simple operation, low required input voltage, and low power consumption. In this work, the time-resolved characteristics of the free surface plasma jet generated by a PT operating in open air have been investigated. The temporal evolution of the PT-driven plasma was visualized by using an intensified CCD camera and plasma formation was correlated with the current behavior of the plasma jet. Notably, the plasma formation is a discrete process, appearing at a relatively fixed phase of the sinusoidal input, and the strongest plasma jet appears at the end of the positive half-cycle. Simultaneous measurements of the current show that the discharge current response is consistent with the chaotic mode for a plasma jet and appears statistically about a 1 mu s earlier than plasma jet light emission, which indicates that there is a strong afterglow. With a low input voltage required for operation, these types of PT-driven plasma jets could have wide utility in emerging plasma applications beyond the laboratory, such as in healthcare and water treatment.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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