Evaluation of a near-infrared reflectance spectrometer as a granulation sensor for first-break ground wheat: studies with six wheat classes
2001
Pasikatan, M.C. | Haque, E. | Steele, J.L. | Spillman, C.K. | Milliken, G.A.
In flour milling, a granulation sensor for ground wheat is needed for automatic control of a roller mill's roll gap. A near-infrared (NIR) reflectance spectrometer was evaluated as a potential granulation sensor of first-break ground wheat using offline methods. Sixty wheat samples, ground independently, representing six classes and five roller mill gaps, were each used for calibration and validation sets. Partial least squares regression was used to develop the models with cumulative mass of size fraction as the reference value. Combinations of four data pretreatments (log (1/R), baseline correction, unit area normalization, and derivatives) and three wavelength regions (700-1,500, 800-1,600, and 600-1,700 nm) were evaluated. Unit area normalization combined with baseline correction or second derivative yielded models that predicted well each size fraction of first-break ground wheat. Standard errors of performance of 4.07, 1.75, 1.03, and 1.40 and r2 of 0.93, 0.90, 0.88, and 0.38 for the >1,041-, >375-, >240-, and >136-micrometer size ranges, respectively, were obtained for the best model. Results indicate that the granulation sensing technique based on NIR reflectance is ready for online evaluation.
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