"The reason NIR has an advantage over IR is that NIR has lower absorbance coefficients.
Due to this, the optimum path length without dilution in the IR is in micrometers, where as long
NIR is in millimeters and short NIR is in centimeters. This means that with NIR it is possible to
measure representative sample portions with simple or no sample preparation. It is this lack of
sample preparation makes this method preferred for analysis of agricultural and food materials."
(Near-Infrared Spectroscopy for Analysis of Agricultural Material
Eric C. Newgard)
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