Proceedings PaperNumerical inversion method for determining aerodynamic effects on particulate exhaust plumes from onboard irradiance data
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The present ad hoc method for determining the physical properties of particulate exhaust plumes inverts multiband irradiance data collected over fields-of-view that are highly oblique to the plume axis; it is therefore applicable to the onboard measurement of in-flight aerodynamic effects on plume properties. A simple analytical model that predicts irradiance under these assumptions is presented, together with measurements of Mg/PTFE plumes in vacuum. The first step of the inversion process generates the locus of possible temperatures and velocities consistent with a given irradiance measurement; the second step uses two independent irradiance measurements to ascertain a unique temperature and velocity solution.