Abstract
A feasibility study of a universal calibration method for nondestructive real–time sensing of moisture content in granular materials is described. The principle is based on measurement of the dielectric properties of granular materials at microwave frequencies and the use of a calibration function that is expressed in terms of these properties to predict moisture content from a single moisture calibration equation. Effectiveness of this method is shown for three granular materials exhibiting significant structural and compositional differences: wheat, oats, and soybeans. The resulting single moisture calibration equation, based on measurements of the dielectric properties at 9.46 GHz and 24 C, provides moisture content in all three materials with a standard error of calibration of 0.46% moisture content, wet basis.
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