Physical Sciences Inc. Publications Abstract: Hyperspectral Infrared Imaging of HF(v,J) Chemiluminescence and Gain in Chemically Reacting Flowfields

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Abstract: Hyperspectral Infrared Imaging of HF(v,J) Chemiluminescence and Gain in Chemically Reacting Flowfields

W.T. Rawlins, D.B. Oakes, S.J. Davis, "Hyperspectral Infrared Imaging of HF(v,J) Chemiluminescence and Gain in Chemically Reacting Flowfields ," presented at 36th AIAA Plasmadynamics and Lasers Conference (Toronto, Ontario, Canada) , (6-9 June2005).

Abstract

We have developed and implemented a hyperspectral infrared imaging technique for probing chemically reacting flows. The technique enables high-resolution spatial mapping of radiating species concentrations, reagent mixing, excited state distributions, and population inversions. The hyperspectral imager consists of a large-aperture, spectrally scanning Fabry-Perot etalon mated to an infrared camera. The etalon is operated at mirror separations comparable to the wavelength, to generate spatially continuous, monochromatic images of the field at each wavelength setting. In operation, a series of wavelengths is rapidly scanned to generate a hyperspectral data cube of two-dimensional images of the spectral radiance at each wavelength, resulting in a spectrum for each location in the field. We have applied this method to observations of HF(v,J) chemiluminescence in both subsonic and supersonic flowfields. The HF(v,J) emission is produced in highly inverted rotational and vibrational distributions by the exoergic reaction of F with H₂.

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