Near Infrared Analysis
- Volume 2 Issue 1
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- Pages.29-36
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- 2001
Modern Pretreatment methods in NIR Spectroscopy
- Yukiteru Katsumoto (Department of Chemistry, School of Sciences, Kwansei Gakuin University, Japan) ;
- Jian Hui Jiang R. (Department of Chemistry, School of Sciences, Kwansei Gakuin University, Japan) ;
- James Berry (Department of Chemistry, School of Sciences, Kwansei Gakuin University, Japan) ;
- Yukihiro Ozaki
- Published : 2001.06.01
Abstract
This review paper outlines modern pretreatment methods used in NIR spectroscopy. The pretreatment methods can be divided into four categories. One method in is noise reduction. Smoothing is a representative method for the noise reduction. Another is baseline correction. The second derivative and multiplicative scatter correction (MSC) are most frequently employed for baseline correction. The third is centering and normalization and the last is resolution enhancement. Difference spectra, mean centering and second derivative are used in NIR spectroscopy as resolution enhancement methods. In this paper advantages and drawbacks of pretreatment methods currently used in NIR spectroscopy are discussed with many examples of NIR spectra.
Keywords
- Noise;
- Derivatives;
- Resolution enhancement;
- Difference spectra;
- Smoothing;
- Fourier self-deconvolution;
- Multiplicative Scater Correlation