Plasma Chemistry and Plasma Processing

, Volume 30, Issue 5, pp 537–552

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

  • C. E. Nwankire
  • V. J. Law
  • A. Nindrayog
  • B. Twomey
  • K. Niemi
  • V. Milosavljević
  • W. G. Graham
  • D. P. Dowling
Original Paper

DOI: 10.1007/s11090-010-9236-5

Cite this article as:
Nwankire, C.E., Law, V.J., Nindrayog, A. et al. Plasma Chem Plasma Process (2010) 30: 537. doi:10.1007/s11090-010-9236-5

Abstract

Plasma diagnostics of atmospheric plasmas is a key tool in helping to understand processing performance issues. This paper presents an electrical, optical and thermographic imaging study of the PlasmaStream atmospheric plasma jet system. The system was found to exhibit three operating modes; one constricted/localized plasma and two extended volume plasmas. At low power and helium flows the plasma is localized at the electrodes and has the electrical properties of a corona/filamentary discharge with electrical chaotic temporal structure. With increasing discharge power and helium flow the plasma expands into the volume of the tube, becoming regular and homogeneous in appearance. Emission spectra show evidence of atomic oxygen, nitric oxide and the hydroxyl radical production. Plasma activated gas temperature deduced from the rotational temperature of nitrogen molecules was found to be of order of 400 K: whereas thermographic imaging of the quartz tube yielded surface temperatures between 319 and 347 K.

Keywords

Plasma jetDiagnosticsPlasma diagnosticsOptical emissionInfrared thermographyCorona

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • C. E. Nwankire
    • 1
  • V. J. Law
    • 2
  • A. Nindrayog
    • 3
  • B. Twomey
    • 1
  • K. Niemi
    • 3
  • V. Milosavljević
    • 2
    • 4
  • W. G. Graham
    • 3
  • D. P. Dowling
    • 1
  1. 1.School of Mechanical and Materials EngineeringUniversity College DublinBelfield, Dublin 4Ireland
  2. 2.National Centre for Plasma Science and TechnologyDublin City UniversityGlasnevin, Dublin 9Ireland
  3. 3.Centre for Plasma Physics, Department of Physics and AstronomyQueen’s University BelfastBelfastNorthern Ireland
  4. 4.Faculty of PhysicsUniversity of BelgradeBelgradeSerbia