The Telops Hyper-Cam midwave (InSb 1.5-5.5 μm) imaging Fourier-transform spectrometer (IFTS) observed repeated detonations in an ethanol-powered internal combustion (IC) engine. The IC engine is a Megatech Corporation MEG 150 with a 1 in. bore, 4 in. stroke, and a compression ratio of 3 : 1. The IC combustion cylinder is made from sapphire permitting observation in the visible and infrared. From a distance of 3 m, the IFTS imaged the combustion cylinder on a 64 × 32 pixel array with each pixel covering a 0.1 × 0.1 cm 2 area. More than 14, 000 interferograms were collected at a rate of 16 Hz. The maximum optical path difference of the interferograms was 0.017 cm corresponding to an unapodized spectral resolution of 36 cm −1 . Engine speed was varied between 600-1200 RPM to de-correlate the observation time scale from the occurrence of detonations. A method is devised to process the ensemble of interferograms which takes advantage of the DC component so that the time history of the combustion spectrum can be recovered at each pixel location. Preliminary results of this analysis will be presented.
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