Diffuse reflectance infrared Fourier transform spectroscopy
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Diffuse Reflectance Infrared Fourier Transform (DRIFT) is an infrared spectroscopy spectra sampling technique used on powder samples with no preparation except for adding to a sample cup. The infrared light on a sample is reflected and transmitted at different amounts depending on the bulk properties of material. The diffuse reflection is produced by the sample rough surfaces reflection of the light in all directions and is collected by use of an ellipsoid or paraboloid mirror. Shape, compactness, refractive index, reflectivity and absorption of the particles are all characteristic of the material being analyzed. If the sample is too absorbent, then it can be diluted with a nonabsorbent material such as potassium chloride, sodium chloride, etc. Particle size should be smaller than the wavelength of the incident light, so this would infer that it should be less than 5 microns for mid-range infrared spectroscopy.