The Near-IR spectra that are used for quality control of food are quite complex to analyse. They contain overtones and combination spectra which are broad-band and a few orders of magnitude lower in intensity as compared to the Mid-IR intensity of the fundamental band.
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Application Note: Comparing Hyperspectral Imaging and Near IR Spectroscopy for detection of Salmonella and other bacteria in milk, juice and poultry
Milk is rich in its ingredients and contains fat, protein minerals, vitamins, carbohydrates and tens of thousands of other ingredients.