Abstract
Theme T is a continuing need for spatially-resolved, nonperturbing measurements of gas temperatures and number density in the high speed flowfields of aerospace ground test facilities. Although the electron beam fluorescence technique satisfies these requirements, its upper density limit of application is on the order of 10 to 10 cc~ as a result of collisional quenching processes. In contrast, the characteristic time of photon-molecule scattering processes is sufficiently small to preclude intermolecular collision effects over the density range normally encountered in aerospace test facilities. Consequently, Raman scattering Spectroscopy is not susceptible to high density limitations resulting from intermolecular collisions and, moreover, fulfills the desired, above-mentioned, requirements for a flow diagnostic technique.
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