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This subtopic solicited Phase I R&D for an advanced Fourier transform infrared (FT-IR) system that would provide fast-scanning high resolution (3 scans/sec at 1cm-1 resolution), low noise, mid-infrared measurements for characterization of spray flames. In Phase I, Advanced Fuel Research, Inc. (AFR) demonstrated FT-IR emission/transmission (E/T) measurements from the NIST spray combustion facility at 7 scans/sec 1 at cm-1 resolution. Significant Phase I work designed the low noise optical system that could be coupled to the NIST spray chamber, and as expected, the high scan rate was successful in removing droplet/particle transit noise from interfering in the mid-infrared spectrum. Tomographic reconstruction of multiple lines of sight through a non-sooting spray flame provided spatially resolved (3 mm) measurements of multiple gas species concentrations and temperatures and initial qualitative information on fuel spray droplets. Phase II R&D will result in further improvements to the optics and coupling design. Spectral resolution is to be improved to 0.5 cm-1 and spatial resolution to 2 mm. Phase II will result in delivery NIST spray combustion facility. NIST researchers will have the capability to non-intrusively probe and characterize the spray flame in more detail than ever before with a single instrument for gases, droplets and soot.