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SPECTROGRAPHIC ANALYSIS OF PLASMA FLOWS,
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
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Both experimental and theoretical studies are reported relating to the spectrographic determination of the temperature and species concentration distributions across the nozzle exit of an arc heated wind tunnel. A detailed review of the basic theory of spectral line intensities is presented and the various spectrographic techniques for the determination of gas temperatures and species concentrations are given. The performance characteristics of the arc tunnel operating with argon are summarized and the effects of various configuration modifications on the basic performance are described. Spectrographic analyses of the exhaust jet are reported. The results indicate that some degree of non-equilibrium electronic excitation was present at the nozzle exit. The gas temperatures obtained from rotational spectra agree reasonably well with theoretical predictions. Author
APPROVED FOR PUBLIC RELEASE