Experimental Study of the Radiative Characteristics of Shock-Heated Air in the Ultraviolet and Visible Spectral Regions

Abstract The results of measuring the integral and temporal spectral characteristics of shock-heated air are presented. The experiments were carried out in a modified double-diaphragm shock tube DDST-M at the Institute of Mechanics of Moscow State University in the range of shock wave velocities from 7.5 to 11.4 km/s at a pressure ahead of the shock wave front p0 = 0.25 Torr. The range of radiation wavelengths λ = 190–670 nm, corresponding to the ultraviolet and visible spectral regions, in which the main contribution to the radiation is made by molecular bands, has been studied. The analysis of the obtained time-integrated radiation spectrograms is carried out. The features of the time oscillograms for the most typical molecular lines of the spectrum are underlined. The data of measurements are compared with the experimental data of other authors.