13 August 2010 First imaging Fourier-transform spectral measurements of detonation in an internal combustion engine
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Abstract
The Telops Hyper-Cam midwave (InSb 1.5-5.5μm) imaging Fourier-transformspectrometer (IFTS) observed repeated detonations in an ethanol-powered internal combustion (IC) engine. The IC engine is aMegatech Corporation MEG 150 with a 1in. bore, 4in. 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 3m, the IFTS imaged the combustion cylinder on a 64×32 pixel array with each pixel covering a 0.1×0.1cm2 area. More than 14,000 interferograms were collected at a rate of 16Hz. The maximum optical path difference of the interferograms was 0.017cm corresponding to an unapodized spectral resolution of 36cm-1. Engine speed was varied between 600-1200RPM 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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Kevin C. Gross, Kevin C. Gross, Chris Borel, Chris Borel, Allen White, Allen White, Stephen Sakai, Stephen Sakai, Rebecca DeVasher, Rebecca DeVasher, Glen P. Perram, Glen P. Perram, } "First imaging Fourier-transform spectral measurements of detonation in an internal combustion engine", Proc. SPIE 7812, Imaging Spectrometry XV, 78120J (13 August 2010); doi: 10.1117/12.861336; https://doi.org/10.1117/12.861336
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