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Standard Normal Variate Transformation and De-Trending of Near-Infrared Diffuse Reflectance Spectra
Abstract
Particle size, scatter, and multi-collinearity are long-standing problems encountered in diffuse reflectance spectrometry. Multiplicative combinations of these effects are the major factor inhibiting the interpretation of near-infrared diffuse reflectance spectra. Sample particle size accounts for the majority of the variance, while variance due to chemical composition is small. Procedures are presented whereby physical and chemical variance can be separated. Mathematical transformations—standard normal variate (SNV) and de-trending (DT)—applicable to individual NIR diffuse reflectance spectra are presented. The standard normal variate approach effectively removes the multiplicative interferences of scatter and particle size. De-trending accounts for the variation in baseline shift and curvilinearity, generally found in the reflectance spectra of powdered or densely packed samples, with the use of a second-degree polynomial regression. NIR diffuse reflectance spectra transposed by these methods are free from multi-collinearity and are not confused by the complexity of shape encountered with the use of derivative spectroscopy.
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Cited by
Visible and near infrared spectroscopy in soil science
Stenberg, B., Viscarra Rossel, R. A., Mouazen, A. M., & Wetterlind, J. (2010) · Advances in Agronomy · doi:10.1016/s0065-2113(10)07005-7 · Cited by 1,549
NIR spectroscopy: a rapid-response analytical tool
Blanco, M., & Villarroya, I. (2002) · TrAC Trends in Analytical Chemistry · doi:10.1016/s0165-9936(02)00404-1 · Cited by 874
Chauchard, F., Cogdill, R., Roussel, S., Roger, J. M., & Bellon-Maurel, V. (2004) · Chemometrics and Intelligent Laboratory Systems · doi:10.1016/j.chemolab.2004.01.003 · Cited by 375
A Review on the Applications of Portable Near-Infrared Spectrometers in the Agro-Food Industry
dos Santos, C. A. T., Lopo, M., Páscoa, R. N. M. J., & Lopes, J. A. (2013) · Applied Spectroscopy · doi:10.1366/13-07228 · Cited by 320
Close range hyperspectral imaging of plants: A review
Mishra, P., Asaari, M. S. M., Herrero-Langreo, A., Lohumi, S., Diezma, B., & Scheunders, P. (2017) · Biosystems Engineering · doi:10.1016/j.biosystemseng.2017.09.009 · Cited by 319
Metadata
- Authors
- Barnes, R. J., Dhanoa, M. S., & Lister, S. J.
- Venue
- Applied Spectroscopy
- Publisher
- SAGE Publications
- Published
- 1989-07
- Volume
- 43
- Issue
- 5
- Pages
- 772-777
- ISSN
- 0003-7028 (ISSN-L)
- 1943-3530
- OpenAlex
- W2016090370
- Cited by
- 3,867
- References
- 0
- FWCI
- 4.94
- Type
- journal article
- Language
- en
- Open access
- closed
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- Barnes, R. J., Dhanoa, M. S., & Lister, S. J. (1989). Standard Normal Variate Transformation and De-Trending of Near-Infrared Diffuse Reflectance Spectra. Applied Spectroscopy. https://doi.org/10.1366/0003702894202201
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