By Pierre Dardenne (Walloon Agricultural Research Centre) and Paulo Salgado (CIRAD)
NIRS theory in a few words
Spectroscopy refers to the science dealing with the interactions between matter and light. In the infrared region (780 – 10 000 nanometers – Figure 1), the light hitting organic matter can be absorbed by the molecular vibrations at specific wavelengths depending on the chemical bonds (OH, CH, NH, etc.).