Abstract: A method is provided for development of independent multivariate calibration models used for determination of secondary properties of a sample based on results of measurements of plurality of primary properties of the sample on target instrument. The method allows development of an independent calibration model for the target instrument regarding results of measurements of plurality of primary properties for sufficient amount of calibration samples with known secondary properties at the reference instrument. In this method, a set of transfer samples are selected, and a plurality of measurements of primary properties are made for each transfer sample using both reference and target instruments. Then relationships of transformation are generated from comparison of the target and reference instruments responses to the transfer samples.

Abstract: The invention relates to analytical instrument engineering, in particular to spectroscopy. The inventive method for measuring spectroscopic properties of bulk products consists in portionwisely supplying a sample in a measurement area. In order to fully fill said measurement area, several portions (at least two) are loaded and alternately placed substantially in different fields of the horizontal section of the measurement area in such a way that the uniformed distribution and the permanent density of the product in the area of measurement are provided. Afterwards, the spectroscopic properties of the sample are recorded in a standstill and the sample is removed from the area of measurement.