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Particle size regression correction for NIR spectrum based on the relationship between absorbance and particle size |
Jinrui MI1,2, Luda ZHANG2, Longlian ZHAO1, Junhui LI1() |
1. College of Information and Electrical Engineering, China Agriculture University, Beijing 100083, China; 2. College of Science, China Agriculture University, Beijing 100083, China |
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Abstract Based on the effect of sample size on the near-infrared (NIR) spectrum, the absorbance (log(R)) in any wavelength is divided into two parts, and one of them is defined as non-particle-size-related spectrometry (nPRS) because it is not influenced by particle size. To study the relationship between the absorbance and particle size, the experiment material including nine samples with different particle size was used. According to the regression analysis, the relationship was studied as the reciprocal regression model, y = a + bx + c/x. Meanwhile, the model divides absorbance into two parts, one of them forms nPRS. According to the nPRS, a new correction method, particle size regression correction (PRC) was introduced. In discriminate analysis, the spectra from three different samples (rice, glutinous rice and sago), pretreated by PRC, could be directly and accurately distinguished by principal component analysis (PCA), while by the traditional correction method, such as multiplicative signal correction (MSC) and standard normal variate (SNV), could not do that.
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Keywords
near-infrared diffuse reflectance spectrometry (NIRDRS)
regression analysis
non-particle-size-related spectrum (nPRS)
particle-size regress correction (PRC)
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Corresponding Author(s):
LI Junhui,Email:caunir@cau.edu.cn
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Issue Date: 05 June 2013
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