Scatter correction of transmission near-infrared spectra by photon migration data: Quantitative analysis of solids

Research output: Contribution to journalArticle

Abstract

The scope of this work is a new methodology to correct conventional near-infrared (NIR) data for scattering effects. The technique aims at measuring the absorption coefficient of the samples rather than the total attenuation measured in conventional NIR spectroscopy. The main advantage of this is that the absorption coefficient is independent of the path length of the light inside the sample and therefore independent of the scattering effects. The method is based on time-resolved spectroscopy and modeling of light transport by diffusion theory. This provides an independent measure of the scattering properties of the samples and therefore of the path length of light. This yields a clear advantage over other preprocessing techniques, where scattering effects are estimated and corrected for by using the shape of the measured spectrum only. Partial least squares (PLS) calibration models show that, by using the proposed evaluation scheme, the predictive ability is improved by 50% as compared to a model based on conventional NIR data alone. The method also makes it possible to predict the concentration of active substance in samples with other physical properties than the samples included in the calibration model.

Details

Authors
  • Christoffer Abrahamsson
  • A Lowgren
  • B Stromdahl
  • Tomas Svensson
  • Stefan Andersson-Engels
  • Jonas Johansson
  • S Folestad
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics

Keywords

  • scatter correction, near-infrared spectroscopy, time-resolved, spectroscopy, diffusion, photon migration, NIR spectroscopy, PLS, partial least squares
Original languageEnglish
Pages (from-to)1381-1387
JournalApplied Spectroscopy
Volume59
Issue number11
Publication statusPublished - 2005
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Atomic physics (011013005), Physics, Faculty of Technology (011013200)

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