Abstract
AbstractLaser‐based diagnostic techniques, developed primarily within the combustion community, offer considerable promise for nonintrusive measurements in gaseous flows relevant to industry. In this paper, we review two diagnostic methods under development in our laboratory. The first technique allows simultaneous measurement of multiple parameters through analysis of the shape and shift of fully resolved absorption lineshapes. The light source is a tunable, narrow‐linewidth semiconductor diode laser, applied in the present case to either water vapor (1.39 microns) at combustion gas temperatures (to 1700 K) or to argon (800 nm) in an atmospheric pressure plasma (at temperatures to 8000 K). Parameters inferred include, for water: temperature, pressure, velocity and species density; for argon, the parameters are electron density, kinetic temperature and the population temperature for the 4 s levels of argon. The second diagnostic technique is planar laser‐induced fluorescence (PL1F), which allows instantaneous measurements of a single parameter at multiple points in the flowfield. The example application to be discussed is single‐shot temperature imaging in a model scramjet flowfield using a two laser‐two camera imaging scheme.
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