Abstract

We report the first use of the resonant Doppler velocimeter (RDV) for the separation of time averaged turbulence components. The RDV is a new nonintrusive diagnostic tool which takes advantage of laser absorption effects to measure the velocity, temperature, and pressure of a flowing gas.^1,2 in this manner it eliminates particle lag which is characteristic of standard laser Doppler velocimetry. Tracer atoms or molecules are seeded into the flowing gas under investigation and are excited by an intersecting laser beam. Since the gas is moving, the absorption frequency is Doppler shifted. The shift provides the velocity component in the direction of the laser beam. Line broadening mechanisms furnish information regarding the temperature and pressure of the flow. The experiment was conducted in a sodium seeded laminar supersonic jet created in a converging/diverging conical nozzle.

© 1983 Optical Society of America