FILTERED RAYLEIGH AND RELIEF IMAGING OF VELOCITY, TEMPERATURE, AND DENSITY IN HYPERSONIC FLOWS FOR THE STUDY OF BOUNDARY lAYERS, SHOCK STRUCTURES, MIXING PHENOMENA, AND THE ACQUISITION OF IN-FLIGHT AIR DATA

We describe here several new techniques which have potential for quantitative diagnostics in hypersonic flow fields. In particular, RELIEF flow tagging of oxygen and Rayleigh scattering are examined. Both have been implemented in a 200 mm x 200 mm high Reynolds number flow facility at Mach 3 and show great promise of being extended into the hypersonic range. Filtered Rayleigh Scattering is an especially attractive approach to hypersonic measurement in both ground-test facilities and on in-flight vehicles.