Mesure de la Temperature Basees sur l'Observation du Premier Systéme Negatif de l'Azote

• Authors: H. Nassar , A. Czernichowski

Title variants

EN

Temperature Measurements Based on the First Negative Spectrum of Nitrogen

• Languages of publication: FR EN

Abstracts

EN

Noisy, non-resolved emission spectra of the (0,0) 391.4 nm N_{2}^{+} molecular band are employed for the rotational (and in some case vibrational) temperature evaluation in different sources in the range of 320-7900 K when the apparatus function of the recording system is unknown. The following sources are examined: an ovoid-shaped transferred arc at atmospheric pressure, a low-pressure transferred arc, a high-voltage high-pressure electric discharge, a low-pressure radio-frequency discharge, and an atmospheric pressure laminar plasma jet. The described method is based on a normalization of the experimental spectrum with respect to the (0,0) band-head amplitude followed by a point-to-point comparison of the real spectrum with respect to a computer simulated spectrum using the best-square fit criterion. This criterion is found as the good one: the relative error on temperature evaluation had the same order of magnitude as the noise-to-signal ratio, even if the last one was relatively high. It was also found that the rotational and vibrational temperatures in the radio-frequency discharge are very different, which indicates an out of thermodynamic equilibrium characteristic of such a discharge. The proposed method of temperature evaluation is shown as quite precise and simple to use for even the non-spectroscopists.

Keywords

EN

33.10.-n; 33.20.-t; 07.20.Ka; 78.40.-q

Discipline

• 07.20.Ka: High-temperature instrumentation; pyrometers
• 78.40.-q: Absorption and reflection spectra: visible and ultraviolet(for infrared spectra, see 78.30.-j; for optical spectra of superconductors, see 74.25.nd; for time resolved reflection spectroscopy, see 78.47.jg; for multiphoton absorption, see 79.20.Ws in impact phenomena)
• 33.20.-t: Molecular spectra(see also 78.47.J- Ultrafast spectroscopy (<1>

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1993
• Volume: 84
• Issue: 2
• Pages: 215-228

Dates

published

1993-08

received

1992-08-15

(unknown)

1993-05-18

Contributors

author

H. Nassar

• Groupe de Recherches sur l'Energétique des Milieux Ionisés, Université d'Orléans, BP 6759, 45067 Orléans cedex 2, France

author

A. Czernichowski

• Groupe de Recherches sur l'Energétique des Milieux Ionisés, Université d'Orléans, BP 6759, 45067 Orléans cedex 2, France

Identifiers

DOI

10.12693/APhysPolA.84.215