Absolute OH density measurements in the effluent of a cold atmospheric-pressure Ar-H2O RF plasma jet in air

Tiny Verreycken, Rob Mensink, Ruud Van Der Horst, Nader Sadeghi, Peter J. Bruggeman

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Absolute OH densities are obtained in a radio-frequency-driven Ar-H 2O atmospheric-pressure plasma jet by laser-induced fluorescence (LIF), calibrated by Rayleigh scattering and by UV broadband absorption. The measurements are carried out in ambient air and the effect of air entrainment into the Ar jet is measured by analyzing the time-resolved fluorescence signals. The OH densities are obtained for different water vapor concentrations admixed to the Ar and as a function of the axial distance from the nozzle. A sensitivity analysis to deduce the accuracy of the model-calculated OH density from the LIF measurement is reported. It is found that the UV absorption and the LIF results correspond within experimental accuracy close to the nozzle and deviate in the far effluent. The possible reasons are discussed. The OH densities found in the plasma jet are in the range (0.1-2.5) × 1021 m-3 depending on the water concentration and plasma conditions.

Original languageEnglish (US)
Article number055014
JournalPlasma Science and Technology
Volume22
Issue number5
DOIs
StatePublished - Oct 2013

Fingerprint

Dive into the research topics of 'Absolute OH density measurements in the effluent of a cold atmospheric-pressure Ar-H<sub>2</sub>O RF plasma jet in air'. Together they form a unique fingerprint.

Cite this