From Rotronic Instrument Corp.
Non dispersive infrared tech-nology relies on the fact that the molecules absorb light (electro-magnetic energy) at spectral regions where the radiated wavelength coin-cides with internal molecular energy levels. In accordance to well know quantum mechanical theory in physical chemistry, such energy reso-nances exist in the mid-infrared spectral region due to interatomic vibrations.
Since different molecules are formed by different atoms (with different masses) the vibrational resonance fre-quencies (and wavelengths) are different for every spe-
cies. This fact is the basis for gas sensing though spectral analysis. By detecting the amount of absorbing light, within just a small spectral region that coincides with the resonance wavelength of the selected species, one gets a measure of the number of molecules of this particular species, free from interfer-ence of other species.
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Topics of Interest
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