Infrared Absorption Spectrometers
This document describes dispersive and Fourier-transform spectrometers that are used in infrared absorption spectroscopy.
Dispersive infrared spectrometers
Common light sources are tungsten lamps, Nernst glowers, or glowbars. Dispersive IR spectrometers use a grating monochromator to select wavelengths and are commonly used when a single wavelength is desired to monitor the kinetics of a reaction or as a GC or LC detector.
Schematic of a dispersive IR absorption spectrometer
Fourier-transform Infrared (FTIR)
Modern IR instruments more commonly use Fourier-transform techniques with a Michelson interferometer.
Picture of an FTIR absorption spectrometer
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Copyright © 1996 by Brian M. Tissue