Diagnostics of Air Purification Plasma Device by Spatially Resolved Emission Spectroscopy

Wanxia Zhao, Zeyad T. Alwahabi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A non-thermal plasma, air purification device (PlasmaShield®, MD250, Keswick, SA, Australia), was investigated using spatially resolved optical emission spectroscopy. The emission spectra were measured with two spatial dimensions to analyze and identify the transition lines of excited NO–γ (A2Σ–X2Π), N2 (C3Π–B3Π), and N2+ (B2Σ–X2Σ) systems. The N2 emission band at 337 and 316 nm were used to determine the spatially resolved vibrational temperature of N2 molecules, (Formula presented.). It was found that the average N2 vibrational temperatures in the x and y directions are almost the same. Two key operating parameters, supplied power and air flow, influence the N2 vibrational temperature. The results demonstrate that applying higher supplied power increases the vibrational temperature, while changes in air flow velocity do not affect the vibrational temperature values. The phenomenological plasma temperature (PPT) was also estimated from the N2 vibrational temperature. It was observed that PlasmaShield® generates excited N2 and NO only within a narrow region around the discharge electrode tip (with peak intensity below 100 µm from the tip). The study also shows no presence of excited OH*, O*, and other radicals.

Original languageEnglish (US)
Pages (from-to)206-220
Number of pages15
Issue number2
StatePublished - Jun 2022

Bibliographical note

Publisher Copyright:
© 2022 by the authors.


  • non-thermal plasma
  • spatially resolved spectroscopy
  • vibrational temperature

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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