Transfer of calibration in near-infrared reflectance spectrometry

The results of an investigation of the transfer of calibration in near-infrared reflectance spectrometry are reported. Four approaches were tested: direct standardization, direct standardization combined with principal components analysis, ordinary least squares and slope/intercept correction. These approaches were used on two different systems, laboratory samples and industrial samples, for which qualitative and quantitative calibrations had been developed previously, After standardization, the standard error obtained was substantially reduced with respect to the original spectra.