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21 November 1997 Measurement of the local density in rarefied flows by means of characteristic fluorescence
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The new method is based on the interaction of fast beam electrons with electrons in the outer shells of atoms, which generates the characteristic x-ray radiation. The intensity of x-rays is proportional to the concentration of the atoms in investigated gas. The gasdynamic structures of rarefied argon jets were studied in the range of stagnation temperatures up to 5200 K using the this x-ray method. The experimental studies of the present work were performed in a low-density gasdynamic chamber. The arc heater was used as a gasdynamic source. The changes in the structure of a jet of monatomic gas beyond a sonic nozzle with variation in the rarefaction and the temperature factor have been clarified as a result of the experiments and generalizations performed.
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Lev I. Kuznetsov and Viacheslav N. Yarygin "Measurement of the local density in rarefied flows by means of characteristic fluorescence", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997);


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