Abstract
Spectroscopic measurements of arc-heated plasma flow are conducted using a hollow electrode arc heated wind tunnel. The test gases are 100 % CO_2and 95% CO_2-5% N_2 mixture gases which simulate Martian atmosphere. In CO_2plasma, radiation of C_2Swan band system is predominant. Other molecular and atomic spectra are not observed except Cu spectra which are produced due to the electrode melting. In CO_2-N_2plasma, radiation of CN violet band system is predominant as well as C_2Swan band system. Other molecular and atomic spectra are not observed except Cu spectra. Analytical tools were used to determine the following line-of-sight-averaged thermodynamic properties from the calibrated spectra. The rotational and vibrational temperatures were measured by a spectroscopic method.
