I am trying to measure the absolute value of density for a room temperature supersonic free jet using Rayleigh scattering.
For the conditions I am operating the jet (reservoir Pressure=5 bar, background=1e-3 mbar), it can lose thermal equilibrium condition in the scattering volume (located far from the nozzle); i.e. axial and radial components of Translation temperature are different.
The stagnant temperature inside the scattering volume (stationary in the lab reference frame) is 300K and the static temperature is expected to drop below 80K. The translational temperature will be different for axial and radial directions and is expected to be lower than 80K.
Is it possible that the scattering phenomenon will behave differently than for a stationary gas in translational thermal equilibrium? If yes, how?
What temperature should I consider to determine the scattering cross-section? Static or stagnant?
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