Time-resolved spectrometry was conducted in the mid-infrared region (2.8– $4.6\mathrm{\mu }\mathrm{m}$ ). A galvano-mirror causes a spectrally dispersed beam to repeatedly sweep up and down a $\mathrm{PtSi}$ focal plane array so that each element of the array is struck by the beam only once at some point within a time frame. Transient spectra of flowing gases (hydrocarbon and carbon dioxide) were measured at $80\mathrm{\mu }\mathrm{s}$ intervals.

© 2007 Optical Society of America

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