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Factors Influencing the Dielectric Properties of Agricultural Products and Food Materials

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2012 Dallas, Texas, July 29 - August 1, 2012  121338239.(doi:10.13031/2013.41891)
Authors:   Stuart O Nelson, Samir Trabelsi
Keywords:   Dielectric properties, Permittivity, Dielectric constant, Loss factor, Agricultural products, Foods, Frequency, Moisture content, Temperature, Density

Dielectric properties of materials are defined, and the major factors that influence these properties of agricultural and food materials, namely, frequency of the applied radio-frequency and microwave electric fields, water content, temperature, and density of the materials are discussed on the basis of fundamental concepts. The dependence of measured dielectric properties on these factors is shown for examples of grain, fruit, and a macaroni and cheese preparation. General observations are provided on the nature of the variation of the dielectric properties with the major variables.

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