Transformations to reduce the effect of particle size in near-infrared spectra

Lorna S. Aucott*, Paul H. Garthwaite, Stephen T. Buckland

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


Near-infrared spectra were determined for samples that differed in their particle size but not in their chemical composition. Various transformations were applied to these spectra to try to reduce differences between them; small differences between the transformed spectra indicate that the effects of particle size have been almost eliminated. Also, using other samples, equations to predict chemical composition were established by applying principal component analysis to transformed and untransformed spectra, followed by multiple linear regression. Transformations that reduced the effect of particle size also increased the predictive value of the major principal components, although the effect of transformations on the accuracy of predictions decreased as the number of components used in the equations was increased. Of the transformations examined, that which seemed most useful was u"/log(1 + u), where u = log(1/reflectance).

Original languageEnglish
Pages (from-to)1849-1854
Number of pages6
JournalThe Analyst
Publication statusPublished - 1 Jan 1988


  • Near-infrared spectrometry
  • Particle size
  • Principal components
  • Transformations


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