The standardisation of near infrared instruments using master selection and Wiener filter methods

In this report, two aspects of near infrared standardisation (calibration t ransfer) were studied: the selection of the master instrument and the stand ardisation algorithm. Their impact on the accuracy of barley protein measur ements was evaluated using 285 fixed-filter Foss Grainspec instruments. Opt ical linear regression, Wiener filter and no standardisation were compared. The statistically-based master selection procedure had a significant impac t on the spectral and calibration transfer when all standardisation techniq ues were applied. Spectral centralisation improved the accuracy of predicti on, particularly when a poorer master was used.