"The primary advantage of the NIR region is that absorbances are lower than in neighbouring regions and generally obey the Beer/Lambert law, i.e., absorbance increases linearly with concentration. This is because NIR absorptions are generally 10-100 times weaker in intensity than the fundamental mid-IR absorption bands. The weakness of the absorptions is a benefit, providing direct analysis of samples without dilution or the requirement of short optical pathlengths or dispersion in non-absorbing matrices used in traditional sampling techniques in UV/Vis and mid-IR spectroscopies."
(http://www.pdkprojects.com/aboutnirs.html#calibration)
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