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FTIR or NIR for dairy analysis?

FTIR spectroscopy is, in principle, very similar to Near Infrared (NIR) spectroscopy, but works at longer wavelengths where the chemical information from the samples is more specific.
While the sensitivity and range offered by the longer wavelengths offers many advantages, it runs into a natural barrier when testing more solid samples. This is because the light can only penetrate a very thin sample (30 -50 um liquid). NIR can depending on wavelength penetrate up to 20 mm of a sample which makes NIR more effective for solid samples. 

FOSS chemometrician Per Waaben explains the difference as well as the benefits of each technology.

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