Density-independent calibration functions are a suitable solution for problems involving variation of bulk density in on-line determination of the moisture content in particulate materials by microwave techniques. Foundations of three of these functions are briefly reviewed and their frequency and temperature dependences are shown for wheat. Their effectivenesses for prediction of the moisture content are compared and optimum conditions for a cost-effective moisture meter are discussed.
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Trabelsi et al. (1998) studied this question.
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