An overview of sample and spectrum preparation methods for near-infrared spectroscopy

Near-infrared (NIR) spectroscopy has increasing significance in various parts of industry, such as food and feed industry, pharmaceutical industry, polymer and semiconductor manufacturing etc. However, the output reliability and precision of NIR spectroscopy depends on the calibration quality, and both measurement accuracy and calibration quality depend on sample and spectrum preparation. This paper gives a short review of the main methods of NIR sample and spectrum preparation methods used in industry and science.