Radiative characteristics of shock-heated air in the visible and infrared regions of the spectrum

Abstract

The integral and temporal spectral characteristics of shock-heated air in the shock wave velocity range from 7.35 to 10.4 km/s at a pressure p0 = 0.25 Torr before the shock wave front were measured. The experiments were carried out on the DDST-M shock apparatus of the Moscow State University Institute of Mechanics. The radiation wavelength range  = 600-1100 nm, corresponding to the visible and near-infrared spectral regions, in which the main contribution to the radiation is provided by atomic nitrogen and oxygen lines, was investigated. The analysis of the obtained integral in time spectrograms of radiation is performed. The peculiarities of time oscillograms for the most typical atomic lines of the spectrum are highlighted. The measurement data are compared with experimental data of other authors.