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- Title
Determination of the Electron Density in an Argon Plasma Jet Using Absolute Measurements of Continuum Radiation.
- Authors
Taghizadeh, Leila; van der Mullen, Joost; Nikiforov, Anton; Leys, Christophe
- Abstract
We present a method to determine the electron density, ne, of an argon plasma jet using the continuum radiation. The radiation measurements are calibrated with a standard tungsten filament lamp. Due to the filamentary nature of these plasmas, it is not possible to use the spectral radiance W m−2 nm−1 sr−1 as the radiometric quantity. Instead we work with the spectral irradiance W m−2 nm−1. As the ionization degree is low, the continuum radiation is predominantly generated by interactions of electron with atoms; the influence of electron-ion interactions can be neglected. The method provides ne values of about 7 × 1019 m−3 in the active zone for an argon plasma created by a sinusoidal peak to peak voltage of 10 kV. Comparison with the ne values determined via the current density shows a fair agreement; this comparison can only be done for the region between the electrodes. In the afterglow region, where the current-density method cannot be applied, we can still use the continuum radiation to determine ne. It is observed that ne decreases in the afterglow direction down to 2 × 1017 m−3.
- Subjects
ELECTRON density; ARGON plasmas; RADIATION; ELECTRON distribution; PLASMA gases; TUNGSTEN lamps
- Publication
Plasma Processes & Polymers, 2015, Vol 12, Issue 8, p799
- ISSN
1612-8850
- Publication type
Article
- DOI
10.1002/ppap.201400203