Physics-Based Multiplicative Scatter Correction Approaches for Improving the Performance of Calibration Models

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Abstract:

Light scattering effects pose a major problem in the estimation of chemical properties of particulate systems such as blood, tissue, and pharmaceutical solids. Recently, Martens et al. proposed an extended multiplicative signal correction (EMSC) approach where light-scattering effects were taken into account in an empirical manner. It is possible to include causal, first-principles mathematical models based on the physics of light scattering into the EMSC framework. This could lead to significant improvements in the separation of absorption and scattering effects. A preconditioning step prior to application of EMSC, whereby a transformation based on the physics of light scattering is used to convert the spectra into a form where the absorption and scattering effects are separable (an underlying assumption of EMSC), is proposed. Results indicate that the transformation followed by EMSC gives better calibration models than the direct application of EMSC to the absorbance spectra.

Keywords: EMSC; EXTENDED MULTIPLICATIVE SCATTER CORRECTION; LIGHT SCATTERING; MSC; MULTIPLICATIVE SCATTER CORRECTION; NEAR-INFRARED SPECTROSCOPY; NIR SPECTROSCOPY; PREPROCESSING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206776342535

Affiliations: 1: Merz Court, Chemical Engineering and Advanced Materials, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, United Kingdom 2: The Norwegian Food Research Institute, CIGENE Center for Integrative Genetics, IKBM/Norwegian U. of Life Sciences, Norway, Osloveien 1, N-1432 Ås, Norway 3: Matforsk/Norwegian Food Research Institute, Osloveien 1, N-1430 Ås, Norway

Publication date: March 1, 2006

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