Instrumentation for Raman/Rayleigh light scattering measurements of gas densities and temperatures in aerospace test facilities

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Instrumentation for Raman/Rayleigh light scattering measurements of gas densities and temperatures in aerospace test facilities

Powell, H.M. / Jones, J.H.

Instrumentation systems have been developed for the measurement of gas species densities and temperatures in a variety of flow situations in aerospace test facilities. These are nonperturbing, time-resolved measurements and utilize the Raman/Rayleigh light scattering technique. The system has been used in both laboratory and test facility environments, including such complex flow situations as radiating rocket plumes immersed in supersonic air flow. The paper presents a brief description of the technique, the details of the instrumentation systems as they relate to the technique, the application requirements, and the interconnection of the respective components. Both conventional and Q-switched laser modes are used depending upon the experimental measurements. In all cases the minicomputer serves as a media for data input and control fuctions for lasers, spectrometers, photon counters, etc. and data monitor and display devices. The epxerimental results have agreed well with theory and other diagnostic measurements. Some anticipated future applications, proposed system improvements, and new instrumentation techniques are discussed for various gasdynamic applications. (DePo)