Abstract
A comparison of several procedures to establish a network of near infrared (NIR) spectroscopy instruments for analytical applications with rapeseed [moisture, protein, oil, glucosinolates (GSL), oleic acid (C18:1)] is presented. The procedures are (a) calibration transfer with bias adjustment, (b) standardisation with different products and different number of samples, (c) calibration with spectra of different instruments and (d) the use of a repeatability file for minimising instrument differences. The most successful procedure proved to be the use of a repeatability file of spectra of the network instruments after standardisation using rapeseed samples. Following this procedure the standard deviation of analyses in a network could be reduced by 50–66% compared to a direct calibration transfer. Calibrations for constituents with high absorptivity (e.g. moisture) could be transferred directly without a bias correction, while those for constituents with a low absorptivity (e.g. GSL) had to be transferred using a repeatability file and standardised instruments.
© 2000 NIR Publications
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription