Laser Raman Scattering — A Technique for Arc-Tunnel Flow Calibration
Laser Raman Scattering (LRS) has been investigated as a possible approach toward providing a nonperturbing flow calibration method for arc-heated wind-tunnel facilities. Such a calibration is needed to evaluate the chemical and thermodynamic properties of the high-temperature air flow which cannot be accurately determined using standard probe techniques. Theoretical calculations showed that the number densities and vibrational temperatures of nitrogen, oxygen, and nitric oxide could be obtained using the Raman spectroscopic method. Exploratory experimental LRS results obtained in the Air Force Flight Dynamics Laboratory 50-Megawatt Re-entry Nose Tip (RENT) Facility showed that it is indeed feasible to apply LRS to arc-tunnel flow diagnostics.
* Dr. Boiarski was a visiting Research Scientist at ARL under Contract F33615-71-C-1463 at the time the experiments were performed.
KeywordsNozzle Exit Vibrational Temperature Pulse Nitrogen Laser Flow Emission Flow Radiation
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