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Träfflista för sökning "WFRF:(Svensson Christoffer) srt2:(2005-2009)"

Sökning: WFRF:(Svensson Christoffer) > (2005-2009)

  • Resultat 1-2 av 2
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1.
  • Abrahamsson, Christoffer, et al. (författare)
  • Scatter correction of transmission near-infrared spectra by photon migration data: Quantitative analysis of solids
  • 2005
  • Ingår i: Applied Spectroscopy. - 1943-3530. ; 59:11, s. 1381-1387
  • Tidskriftsartikel (refereegranskat)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.
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2.
  • Chauchard, F, et al. (författare)
  • Least-squares support vector machines modelization for time-resolved spectroscopy
  • 2005
  • Ingår i: Applied Optics. - 2155-3165. ; 44:33, s. 7091-7097
  • Tidskriftsartikel (refereegranskat)abstract
    • By use of time-resolved spectroscopy it is possible to separate light scattering effects from chemical absorption effects in samples. In the study of propagation of short light pulses in turbid samples the reduced scattering coefficient and the absorption coefficient are usually obtained by fitting diffusion or Monte Carlo models to the measured data by use of numerical optimization techniques. In this study we propose a prediction model obtained with a semiparametric modeling technique: the least-squares support vector machines. The main advantage of this technique is that it uses theoretical time dispersion curves during the calibration step. Predictions can then be performed by use of data measured on different kinds of sample, such as apples.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Abrahamsson, Christo ... (2)
Svensson, Tomas (2)
Andersson-Engels, St ... (2)
Lowgren, A (1)
Stromdahl, B (1)
Johansson, Jonas (1)
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Folestad, S (1)
Svanberg, Sune (1)
Bellon-Maurel, V. (1)
Chauchard, F (1)
Roussel, S (1)
Roger, JM (1)
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Lunds universitet (2)
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Engelska (2)
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Naturvetenskap (2)
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2005 (2)

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