Quantitative planar Raman imaging through a spectrograph: visualisation of a supersonic wedge flow |
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| Authors: | R. A. L. Tolboom N. J. Dam J. J. ter Meulen P. G. Bakker |
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| Affiliation: | (1) Institute for Molecules and Materials, Applied Physics, Radboud University Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands;(2) Aerodynamics, Delft University of Technology, Delft, The Netherlands |
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| Abstract: | Planar Raman imaging through a spectrograph is demonstrated as a diagnostic tool for quantitative flow visualisation of internal supersonic wedge flow. A dedicated Bayesian deconvolution filter is used to remove the spectral structure that is introduced by the spectrograph. The 2D density field is determined with ca. 10% precision using average images over 6,000 laser pulses, down to 0.5 mm from the surface of the wedge. Direct interpretations of Raman intensities provide more precise density data than indirect interpretations based on shock geometry in 2D inviscid flow.
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