DEVELOPMENT OF AN INTEGRATED SYSTEM FOR THE WIND TUNNEL MEASUREMENT OF AIR VELOCITY TEMPERATURE AND DENSITY

NEW VELOCITY MEASUREMENT TECHNIQUES, WHICH USE ARF LASER INDUCED FLUORESCENCE (LIF) IN CO2 AND IN CO FORMED BY THE LASER, ARE PROPOSED.THE NEW TECHNIQUES WILL COMBINE WITH OTHER LIF TECHNIQUES, UNDER DEVELOPMENT BY US, WHICH MEASURE DENSITY AND TEMPERATURE TO FORM WITH THEM AN INTEGRATED SYSTEM FOR SINGLE PULSE MEASUREMENT OF THREE INDEPENDENT FLOW PARAMETERS. ALL THREE TECHNIQUES ARE MOST SUITED FOR COLD FLOW HYPERSONIC (3-20 MACHS) WIND TUNNEL APPLICATIONS, THEY ALL RELY ON THE SCATTERING FROM NATURAL AIR CONSTITUENTS (N2, O2, CO2) WITH NO SEEDING REQUIREMENTS AND WITH THE NEED FOR ONLY ONE ACCESS WINDOW. THESE FEATURES MAKE THE INTEGRATED SYSTEM A CANDIDATE FOR BOTH WIND TUNNEL AND ON-FLIGHT MEASUREMENTS.