Radiative Diagnostics in Nonequilibrium Flows
Conventional shock tube spectroscopy generally proceeds along two lines. One of these has been stressed in the previous paper, in which the shock tube is used to provide a method for processing gases to high temperature equilibrium conditions, under which the radiation from the gases can be measured, and the spectroscopic parameters of the radiating species thereby deduced. The second aspect is that of using known radiating systems as diagnostics to deduce the kinetics of various gasdynamic or molecular processes. In this paper, examples of each will be discussed, with the emphasis placed on nonequilibrium measurements. These examples are taken in part from a current research program at this laboratory, wherein the objective of the work is to obtain the data necessary to calculate the vacuum ultraviolet (VUV) radiation flux behind strong shock waves in air. To do this, the problem involves two tasks: (a) to obtain the spectral distribution and the associated transition probabilities for the radiation, and (b) to measure the excitation rates that govern the populations of the relevant electronic states.
KeywordsShock Wave Shock Tube Incident Shock Incident Shock Wave Vacuum Ultraviolet
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