Advanced Concept for Air Data System using EBF and Lidar

We describe here two innovative in-flight measurement techniques for onboard operation on atmospheric re-entry demonstrator vehicles like EXPERT or pre-X actually in study in Europe. The first one is the Electron Beam Fluorescence (EBF) technique which aims at characterising shock layer chemistry through measurements of density, rotational and vibrational temperatures of N2 and NO in low density hypersonic flows. These data are of great importance for the validation of the modelling tools commonly used for aerothermodynamics simulations, since they include a variety of thermo-chemical models yet to be fully validated with relevant flight data. The second measurement technique is a short range Rayleigh Lidar for measurements of upstream total density which is a primary variable in many aerodynamic key features like forces or heat flux.