The Investigation in Combustion of Energetic Materials (InCoME) program is aimed at validating the numerical simulation of composite propellant combustion using nonintrusive optical techniques. The Focusing Schlieren Technique (FST) was selected; it allows catching light deviation from a thin vertical planar section centered above the propellant combustion surface. The optical system is described in the paper. Signi¦cant results are presented showing the capabilities of this technique when applied to solid propellant combustion in terms of studying §ame structure, §ame propagation, and particle tracking.

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