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1

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

100%

Nassar H., Czernichowski A.

Acta Physica Polonica A

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1993

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vol. 84

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issue 2

215-228

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.

2

Temperature Measurements in Non-Equilibrium "Ferroelectric" Plasma

61%

Pawelec E., Simek M., Nassar H., Czernichowski A., Musioł K., Dittrichova L.

Acta Physica Polonica A

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1996

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vol. 89

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issue 4

503-507

EN

Using spectroscopic measurements vibrational and rotational temperatures were determined in the "ferroelectric" plasma source for different gas mixtures. It was shown that in this time-periodical, atmospheric pressure non-equilibrium discharge, both plasma temperatures differ strongly, and that the vibrational temperature is much higher (≈ 3 kK) than the rotational one (< 1 kK).

3

Spectral and Electrical Diagnostics of Gliding Arc

52%

Czernichowski A., Nassar H., Ranaivosoloarimanana A., Fridman A., Simek M., Musiol K., Pawelec E., Dittrichova L.

Acta Physica Polonica A

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1996

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vol. 89

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issue 5-6

595-603

EN

Using spectroscopic and electric measurements, vibrational and rotational molecular gas temperatures as well as free electron temperature and concentration were determined in different regions of a time-periodical type, atmospheric pressure non-equilibrium low current gliding arc. It was shown that this discharge includes an initial quasi-equilibrium zone, with the quasi-equilibrium temperature of 4 to 6 kK, and the non-equilibrium zone with the electron temperature about 10 kK, the vibrational temperature about 3 kK, rotational and translational temperatures from 1 to 1.5 kK. The transition between two mentioned zones coincides with the phenomenon of the arc "length explosion" already observed in moderate-current gliding arc.

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3 Acta Physica Polonica A

2 1996

1 1993

3 Czernichowski A.

3 Nassar H.

2 Dittrichova L.

2 Pawelec E.

2 Simek M.

1 Fridman A.

1 Musiol K.

1 Musioł K.

1 Ranaivosoloarimanana A.

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

Temperature Measurements in Non-Equilibrium "Ferroelectric" Plasma

Spectral and Electrical Diagnostics of Gliding Arc