Near-infrared spectroscopy moisture content measurement

Approaches to monitor the moisture content of product without resorting to sampling the product include the Ar process " and current PAT approaches, frequently involving the measurement of the moisture content using near-infrared spectroscopy (NIR). 

Table 6.7. Soybean Seed Composition in Percentage at 13.0% Moisture Content as Measured by Near-Infrared Spectroscopy for Oil from Commodity and Six Types of Genetically Modified Soybeans...

K. Suehara, Y. Ohta, Y. Nakano, T. Yano. Rapid measurement and control of the moisture content of compost using near-infrared spectroscopy. J Biosci Bioeng 87(6) 769-774,... 

Several applications can be found in literature regarding the use of NIR for the paediction of the main physical and rheological parameters of pasta and bread. De Temmerman et al. in 2007 proposed near-infrared (NIR) reflectance spectroscopy for in-line determination of moisture concentrations in semolina pasta immediately after the extrusion process. Several pasta samples with different moisture concentrations were extruded while the reflectance spectra between 308 and 1704 ran were measured. An adequate prediction model was developed based on the Partial Least Squares (PLS) method using leave-one-out cross-validation. Good results were obtained with R2 = 0,956 and very low level of RMSECV. This creates opportunities for measuring the moisture content with a low-cost sensor. 

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