Physics, Instrumentation and Sensing
Optical diagnostics in hypersonic flows and in the upper atmosphere
Convection of a plasma column induced by a pseudo-spark electron
gun in the F4 wind tunnel. Such visualization is useful
to image velocity profiles in hypersonic flows.
The DMPH/DOP research unit is deeply involved in developing and using the following instrumentation to probe hypersonic flows and the upper atmosphere :
- Temperatures and velocity measurements using Coherent Anti-Stokes Raman Scattering (CARS) and Optical Parametric Oscillator (OPO)
- Fast scanning infrared Diode Laser Absorption Spectroscopy (DLAS) for velocity, temperature and NO/CO/CO2/H2O concentrations measurements in high enthalpy wind tunnels like ONERA-F4 or DLR-HEG
- Cavity Ring Down Spectroscopy(CRDS) to probe O2 and other trace species in windtunnels and the upper atmosphere
- Pseudo-Spark or Sheet Electron guns for velocity, density and temperature measurements using electron beam fluorescence (EBF) in the visible and X-ray spectral regions
- Rayleigh LIDAR for upstream density on board reentry demonstrator vehicle
In-flight measurements on board reentry demonstrators
