Abstract
The measurement of free-electron densities and collision frequencies in ionized-gas flows by a probing transverse microwave beam is described. Interpretation of the observed reflection and transmission coefficients and their phases is developed on the basis of an idealized plane wave-plane slab model, for which typical results are displayed. Application of the device and technique to a specific experiment—the buildup of ionization behind a strong shock in argon—is outlined. Effects of various departures of the microwave radiation patterns and flow configurations from the slab assumptions are discussed and examples evaluated.
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