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Standardisation and calibration transfer for near infrared instruments: a review

Fearn, T; (2001) Standardisation and calibration transfer for near infrared instruments: a review. J NEAR INFRARED SPEC , 9 (4) 229 - 244.

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Abstract

Transferring calibrations between near infrared instruments is not always straightforward, even when the instruments are nominally the same. Problems can include both wavelength shifts and differences in absorbance response between Instruments. This review describes a number of chemometric methods that have been developed to aid Calibration transfer. The approaches are classified under three headings: making robust calibrations, adjusting calibrations and adjusting spectra. Calibrations can be made more robust, and more transferable, by the appropriate use of spectral pre-treatments that reduce between-instrument variability. Robust calibrations can also be made by pooling data from several instruments when calibrating. Calibrations can be adjusted using skew and bias corrections estimated from a modest number of samples with known reference values. Under the third heading, adjusting spectra, come methods such as piecewise direct standardisation and the patented method of Shenk and Westerhaus that use spectral information from samples measured on two instruments to match the spectral response of the instruments.

Type:Article
Title:Standardisation and calibration transfer for near infrared instruments: a review
Keywords:NIR, instrument standardisation, calibration transfer, direct standardisation, robust calibration, PIECEWISE DIRECT STANDARDIZATION, UNDRIED GRASS-SILAGE, SPECTROMETRIC INSTRUMENTS, MULTIVARIATE CALIBRATION, FILTER INSTRUMENTS, SPECTROSCOPY INSTRUMENTS, MODEL TRANSFERABILITY, NEURAL-NETWORKS, SPECTRA, REFLECTANCE
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Statistical Science

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