FT-IR emission/transmission spectroscopy for in situ combustion diagnostics

An infrared emission/transmission (E/T) technique, (a method previously used as an in-situ diagnostic for gases and soot particles using dispersive infrared) has been implemented with a Fourier Transform Infrared Infrared (FT-IR) spectrometer and extended to include measurements on particles, as well as gases (CO2, H2O, ethylene, methane, butane, and acetylene) and soot particles. The method can measure both the concentration and temperature of each of the phases. This paper presents the applications of FT-IR E/T spectroscopy to gases and soot particles in reacting flows. Several examples are presented including a coannular laminar ethylene diffusion flame. The results for soot particle temperature and concentration in this flame are in good agreement with measurements reported by other investigators.

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