DATA TREATMENT IN NEAR-INFRARED SPECTROSCOPY

Since the last ten years, the use of near-infrared spectroscopy is inc reasing due to the improvement of instrumentation and software. The ca lculation capacity of today computers allows a promising future for th is technique. According to the complexity of structural attribution of absorption bands, only a chemometric approach is able to solve qualit ative and quantitative applications. Depending on spectrophotometers a nd analytical context, the signal treatment and the calculation strate gy may vary. For an identification task, cluster analysis is built on spectral data from only a few wavelengths using disperse spectrophotom eter when principal component analysis is applied on overall spectral range with interferometer based apparatus. The main quantitative calcu lation modes i.e. MLR, PCR and PLS are discussed.