1. Centre of Physics Teaching and Research, Jilin University, Changchun 130025, China 2. Changchun Institute of Optic, Fine Mechanics and Physics, Changchun 130022, China
Abstract：Short wave near-infrared spectrum of whole wheat was obtained by diffusion reflection. PLS method was used to analyze protein content of whole wheat. Different wavelength ranges were chosen for regression and information abstraction. The 3D-curves were shown for different factors，prediction residual sum of squares (PRESS)，and RMSECV. The best wavelength ranges and factors were determined. Analysis results for protein content of whole wheat were shown in three wavelength regions, and the predicted results were compared and discussed. The method of selecting advantageous wavelength ranges is feasible to obtain high prediction precision.
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