Raman Gas Mixing Measurements and Ramanography
Application of Raman scattering as a gas dynamics diagnostic tool has been under development at Sandia since 1969. The early stages of this effort were directed toward developing a capability to measure transient mixing phenomena over a l second time interval. Transient concentration measurements of nitrogen injected into helium were obtained using an AVCO 100 pps N2 laser1. More recent Raman gas mixing studies were aimed toward examining the effect of pressure level on mixing of H2, D2, N2, and He2. These experiments collected Raman scattering from a l mm sample volume inside a closed vessel. An on going effort to measure Raman scattering from steady state turbulent flows is shown in Figure 1. In this effort, direct measurement of Reynold’s stresses are being attempted by P. 0. Witze at Sandia.
KeywordsInterference Filter Closed Vessel Laser Raman Spectroscopy Pulse Laser Light Transient Concentration Measurement
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- 2.Hartley, D. L., “Application of Laser Raman Spectroscopy to the Study of Factors that Influence Turbulent Gas Mixing Rates,” Fluid Mechanics of Mixing, ASME, p 131, June 1973, also to be published in AIAA Journal.Google Scholar