Abstract
Single shot spatially and spectrally resolved laser induced predissociation fluorescence measurements in a shock layer around a cylinder in a pulsed supersonic free stream are presented. Fluoresence signals were produced using the tuned output of an argon fluoride excimer laser to excite a mixture of rovibrational transitions in molecular oxygen. The signals produced along a line inside the shock layer were focussed onto a two dimensional detector coupled to a spectrometer, thus allowing spectral and spatial resolution of the fluoresence. In this way, it was possible to detect two fluoresence signals from two different transitions simultaneously, allowing the determination of vibrational temperatures without the need for calibration. To minimize problems associated with low signal to noise ratios, background subtraction and spatial averaging was required.
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Sutton, D.J., Houwing, A.F.P., Palma, P.C. et al. Vibrational temperature measurements in a shock layer using laser induced predissociation fluorescence. Shock Waves 3, 141–148 (1993). https://doi.org/10.1007/BF02115893
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DOI: https://doi.org/10.1007/BF02115893