Мicrochannel Structure Parameters in the Initial Phase of a Spark Discharge in a Tip–Plane Gap in Atmospheric-Pressure Air

2021 ◽  
Vol 47 (1) ◽  
pp. 71-74
Author(s):  
K. I. Almazova ◽  
A. A. Amirova ◽  
A. N. Belonogov ◽  
V. V. Borovkov ◽  
G. B. Ragimkhanov ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Initial Phase ◽  
Spark Discharge ◽  
Structure Parameters

scholarly journals Влияние предыонизации на микроканальную структуру искрового разряда в воздухе в промежутке острие-плоскость

2022 ◽  
Vol 92 (1) ◽  
pp. 52
Author(s):  
А.А. Тренькин ◽  
К.И. Алмазова ◽  
А.Н. Белоногов ◽  
В.В. Боровков ◽  
Е.В. Горелов ◽  
...  
Keyword(s):  
Wave Front ◽  
Electron Concentration ◽  
Atmospheric Pressure ◽  
Initial Phase ◽  
Discharge Channel ◽  
Cathode Region ◽  
Ionization Wave ◽  
Anode Region ◽  
Microstructure Formation ◽  
Micron Diameter

The initial phase of a spark discharge in the gap between the pin (cathode) and a plane 1.5 mm long in atmospheric pressure air under conditions of preliminary photoionization by an auxiliary discharge was investigated by the method of shadow photography. In the absence of preionization, the discharge from the first nanoseconds after breakdown is an aggregate of a large number of micron-diameter channels. It was found that the electron concentration resulting from preionization, estimated at 108  109 cm-3, increases the degree of uniformity of the discharge channel in the near-cathode region; however, in the near-anode region, the channel remains microstructured. Within the framework of the mechanism of microstructure formation due to the instability of the ionization wave front, a criterion for the formation of a uniform discharge is obtained and an explanation of the results obtained is presented.

scholarly journals The spectrum of fluorine (FI)

1926 ◽  
Vol 113 (764) ◽  
pp. 323-334 ◽  
Keyword(s):  
Atmospheric Pressure ◽  
Neutral Atom ◽  
Spark Discharge ◽  
Silicon Tetrafluoride ◽  
Vacuum Tube ◽  
First Order ◽  
Infra Red

The investigations of the spectrum of fluorine which had been made up to the year 1923 are summarised in Kayser’s ‘Handbuch der Spektroscopie’ (vol. 5, p. 444; vol. 7, p. 401). They include measurements of lines attributed to fluorine by various workers, but there is no attempt to classify the lines of the neutral atom, the singly ionised atom, etc. Gale and Monk, however, have since published further measures of fluorine lines, and have made the beginnings of a classification by distinguishing the lines produced in vacuum-tube discharges through fluorine gas from those obtained only from a spark discharge in the gas at atmospheric pressure: Their work has been followed up by Carragan, who has made a study of the Zeeman effects for some of the lines of the former group, and, from the rules of Landé, has deduced the existence of multiplets of the first order and suggested certain term combinations. The results here recorded are the first-fruits of an investigation of the fluorine spectrum under different conditions of excitation. Evidence of at least three successive spectra has been obtained as the exciting agency is gradually intensified. Under the gentlest stimulus the lines which appear form an isolated group in the red and infra-red region of the spectrum. They are in the main identical with the vacuum-tube lines of Gale and Monk, and have been produced simultaneously with strong bands of silicon tetrafluoride when a discharge has been passed through this gas. They have accordingly been assigned to the neutral atom of fluorine. The identification, measurement and classification of these lines form the substance of the present paper. Data concerning the spectra produced by more intense discharges will be published in due course.

scholarly journals A time-resolved imaging and electrical study on a high current atmospheric pressure spark discharge

2015 ◽  
Vol 118 (23) ◽  
pp. 233305 ◽  
Author(s):  
J. M. Palomares ◽  
A. Kohut ◽  
G. Galbács ◽  
R. Engeln ◽  
Zs. Geretovszky
Keyword(s):  
Atmospheric Pressure ◽  
Spark Discharge ◽  
High Current ◽  
Time Resolved ◽  
Time Resolved Imaging ◽  
Electrical Study

Plasma and Gas-Dynamic Near-Electrode Processes in the Initial Phase of a Microstructured Spark Discharge in Air

2020 ◽  
Vol 46 (8) ◽  
pp. 737-740 ◽  
Author(s):  
K. I. Almazova ◽  
A. N. Belonogov ◽  
V. V. Borovkov ◽  
V. S. Kurbanismailov ◽  
G. B. Ragimkhanov ◽  
...  
Keyword(s):  
Initial Phase ◽  
Spark Discharge ◽  
Electrode Processes ◽  
Gas Dynamic

The Mechanism of Spark Discharge in Air at Atmospheric Pressure. I

1940 ◽  
Vol 11 (6) ◽  
pp. 438-447 ◽  
Author(s):  
Leonard B. Loeb ◽  
John M. Meek
Keyword(s):  
Atmospheric Pressure ◽  
Spark Discharge
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