Abstract
Ultraviolet and mid-infrared radiations behind shock wave in Mars simulant gases are detected in order to expect the radiative heating for future Mars missions. According to the CFD calculation coupled with the radiation analysis code, SPRADIAN2, for a small-sized Martian aerocapture demonstrator, the radiation intensity from VUV wavelength region is dominant in the forebody region, while that from mid-IR wavelength region is dominant in the aftbody region. In VUV region, the absolute spectral radiances from CO 4th positive band are evaluated by the absolute intensity calibration with a Deuterium lamp from 6.0 to 7.5 km/s. By fitting these profiles with Planck curves, equilibrium temperatures are estimated. The experimental values are less than 5% lower than the simulated ones. In mid-IR wavelength region, time histories of the radiation intensity from CO2 ro-vibrational modes are measured by an InSb photovoltaic detector from 2.5 to 7.5 km/s. From the comparison of the relative values in equilibrium region, the IR radiation is highest at around 3.5 km/s and lowest at around 6 km/s.
