Quantifying high speed air flows by light scattering from air molecules
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1994 by the American Institute of Aeronautics and Astronautics, Inc. All right reserved. While optical diagnostics have long been used for the measurement of high-speed air flows, the recent availability of high-intensity, short-pulsed ultraviolet laser sources has led to quantitative cross-sectional and volumetric flow field measurements. Laser-induced fluorescence-based diagnostics have laid die foundation for these new measurements. It is becoming clear, however, that laser-induced fluorescence has serious limitations due to saturation, quenching, laser extinction, and seeding requirements. Imaging by Rayleigh scattering and, with future developments, by Raman scattering shows the promise of moving beyond these limitations and achieving the goal of capturing full time- evolving flow field structure in both supersonic and hypersonic flow regimes.