Home > Search Results: "Symposium on Physics of Switching Arc - FSO 2007 /17./"
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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
3D diagnostika koherentních struktur ve volném proudu plazmatu
 Hlína, Jan ; Sekerešová, Zuzana ; Šonský, Jiří
Optical radiation of a thermal plasma jet was recorded by a fast - shutter CCD camera through an optical system providing two perpendicular and simultaneous views of the jet. The measuring system yielded series of plasma jet images containing 8 pictures with exposure times 400 ns and intervals 7 us. The evaluation of the records was based on reconstructing the distribution of plasma optical radiation in planes perpendicular to the plasma jet axis by the inverse Radon transform. A repetitive application of this transform along the axis of the jet yielded the complete 3D distribution of the optical emission in the plasma jet. The differences between the resulting 3D matrices representing the optical intensities derived from adjacent pictures in the recorded series was used for the identification of coherent structures as regions characterized by the temporal increase or decrease of the optical emission.
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Aplikace waveletové analýzy a Fournierovy transformace pro zkoumání časoprostorové dynamiky termického plazmatu
 Gruber, Jan
Electric arc plasma generated by the plasma torch (plasmatron) was analyzed. Electric arc and resulting plasma jet were observed from four directions in two parallel planes perpendicular to the jet axis and arc current and voltage were also recorded synchronously. The record lengths and time resolution were sufficient for the application of the FFT yielding a detailed view of the oscillation phenomena in the plasma flow and for comparison with oscillations of voltage and current. Significant oscillations were identified and their planar distributions examined. Wavelet analysis was used for temporal dynamics investigation yielding information about structures dynamics. Different types of structures were identified and their mutual influence is described.
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