Abstract
A two-channel digitized system for measuring small density and temperature fluctuations in turbulent air (e.g., in flow in a wind tunnel) is described. The method is based on the fact that ten rotational lines of the X(v" = 0) to B(v′ = 4) absorption manifold of O2 fall within the tuning range of the ArF excimer laser. Although fluorescence from the excited B states of O2 is weak due to predissociation, it is sufficient to provide a sensitive means of monitoring small changes in the ground state populations induced by temperature or density fluctuations. This can be done with a single-laser pulse, and the fluorescence is collected at 90° from the incident 193-nm laser beam; hence excellent temporal and spatial resolution is achieved.
© 1984 Optical Society of America
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