The potency of Fourier transform spectroscopy (FTS) for chemical analysis is well established. It provides identification and quantification of multiple biogenically important compounds such as CH4, NH4, NOx, and H2O with a level of sensitivity in the parts per million range and the specificity inherent in spectroscopic analysis. FTS is built upon the technique of interferometry, in which a beam of light from an emitting source is split (usually with a semitransparent mirror assembly). (source: spie.org)
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