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Atmospheric pressure plasma acoustic moment analysis
Law, Victor J.; O'Neill, Feidhlim T.; Dowling, Denis P.
Low-order moment around the mean (mean, standard deviation and skewness) analysis of the time evolving specific acoustic intensity of an air atmospheric pressure plasma jet is performed as a function of nozzle-to-surface gap (0.5 to 7 cm), drive frequency (19, 22, and 25 kHz) and air flow rate (35.7 to 76.6 l/m). The probability distribution of each time-series dataset exhibits deterministic correlations with contrasting entropy process regions afterglow (blown arc process (gap = 0.5 cm and 1740 ±100 K); and gap = 1 to 7 cm and 300 to 400 K)). The results indicate that the heated air is channeled along the surface and has a preferred backscatter an ular. In addition the blown arc process exhibits a skewness of +0.055 and the afterglow has skewness values from -0.05 to -0.4. These results illustrate how acoustic information can be used to differentiate plasma-surface entropy states.
Keyword(s): Acoustic noise; Atmospheric plasma jet; Acoustic intensity
Publication Date:
2011
Type: Conference item
Peer-Reviewed: No
Language(s): English
Institution: University College Dublin
Funder(s): Science Foundation Ireland
Publisher(s): American Institute of Physics
Related Link(s): http://dx.doi.org/10.1063/1.3637773
First Indexed: 2013-10-22 05:39:29 Last Updated: 2018-04-14 06:24:06