Most applications of Fourier transform infrared spectroscopy are in areas where the low radiant energy is a severe problem. Therefore, the advantage of interferometric systems provides important development in the signal-to-noise ratio met with grating or prism instruments. An additional advantage is that the interferometer optics give a lot of energy throughput compared to the dispersive optics. The higher energy achieving the detector with FTIR instruments regularly results in an added to sensitivity.
The FTIR method does not give the advantage of a decent quality grating spectrophotometer. Also, it is suffering from the comparison in case of high initial cost and adequate maintenance problems. The latter arises as the quality of an FTIR spectrum degrades with equipment maladjustment and faster than a grating spectrum.
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