High resolution spectroscopic observations of the Stardust SRC entry

Michael Winter , Institut fuer Raumfahrtsysteme (IRS), Universitaet Stuttgart, Germany
At the Institute of Space Systems atmospheric reentries are under investigation in different plasma wind tunnels at specific enthalpies up to 140MJ/kg and stagnation pressures between 10Pa and 200hPa. Various plasma diagnostic methods are in use of which the optical methods such as LIF, Fabry-Perot interferometry and emission spectroscopy are of particular interest. In parallel, the reentry flow around a space craft is simulated by CFD computation. For the Stardust observation, a grating spectrometer coupled to a telescope by fibre optics is proposed. An EMCCD camera in full vertical binning mode with a repetition rate of up to 400 Hz is used for detection. With a 1200 l/mm grating, a spectral range from 325 nm to 450 nm with a HWFM of 0.5 nm is achieved without slit. With a slit, the HWFM can be reduced on the cost of intensity. Alternatively, gratings with 600 l/mm, 1800 l/mm and 3600 l/mm are available.