Browsing by Author "Ferouani, A. K."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    EFFECT OF DENSITY AND TEMPERATURE PROFILE OF He GAS IN INTERFEROMETER METHOD USING LASER He-Ne
    (University of Eloued جامعة الوادي, 2018-02-05) ASKRI, S.; Lemerini, M.; Ferouani, A. K.
    This work presents an optical diagnosis using interferometer method (Fig.1) using laser He-Ne. The density and the temperature are visualized by studying the interferograms of He (helium) gas medium subjected to a stationary DC (Corona Discharge) at atmospheric pressure [1-2]. The density is extracted from the phase shifting introduced by the studied medium, and the temperature is deduced from the ideal gas law. The refractive index is related to the density through the Gladstone–Dale equation [3]. The experimental set up that we have applied here is assumed to be cylindrically symmetric and the distance between electrodes, equals 10 mm. The obtained results show that the rate variation of the density increase from 10 to 45% and the temperature is varying between 300 to 500 K in all the space.
  • Thumbnail Image
    Item
    SPECTROSCOPIC DIAGNOSIS IN ELECTRONIC TEMPERATURE OF PHOTOIONISE PLASMAS
    (University of Eloued جامعة الوادي, 2009-07-01) Ferouani, A. K.; Inal, M. K.
    In this work, we are interested in the diagnostics in electronic temperature of a plasma purely photoionized, based on the intensity ration of lines emitted by ions helium-like, which have an atomic number Z relatively small. We considered the three lines corresponding to the transitions starting from the excited levels 1s2l towards the fundamental level 1s2 1S0, like appropriate lines. More precisely, the line of resonance w due to the transition 1s2p 1P1 1s2 1 S0, the line of intercombinaison (x,y) 1s2p 3 P2,1 1s2 1 S0 as well as prohibited line z due to the transition 1s2 3 S1 1s2 1 S0. These lines appear clearly in the spectra of astrophysical plasmas. As helium-like ion, we chose two, the oxygen O6+ (Z=8) and neon Ne8+ (Z=10). We carried out calculations of the ration of lines intensity G=(zxy)/w of O6+ and Ne8+ according to the electronic temperature in the range going from 105 to 107 K. We will see that, like it was shown by Gabriel and Jordan in 1969 [1], this intensity ration can be very sensitive to the temperature electronic and practically independent of the electronic density. Consequently, the ration G can be used to determine in a reliable way the electronic temperature of plasma observed