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Dielectric Properties of Grain and Seed and Their Usefulness in Sensing Physical Properties

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

Citation:  Paper number  13158880,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Stuart O. Nelson, Samir Trabelsi
Keywords:   Cereal grain Density Dielectric properties Electrical properties Moisture content Moisture sensing Oilseed Permittivity.

Abstract. The importance of moisture measurement in grain and seed is discussed, and the usefulness of grain and seed dielectric properties in sensing moisture content of these materials is presented. Data are presented graphically for the dielectric properties of grain and seed showing their variation with frequency, moisture content, temperature, and bulk density, and references are cited for further information. More recent developments in higher frequency and microwave measurements for moisture content and bulk density sensing are described and numerous studies are cited providing sources of information on these newer techniques. Measurement at microwave frequencies offers means for sensing both moisture content and bulk density, thus providing density-independent moisture sensing and sensing of bulk density independent of moisture and temperature. Sensing of kernel moisture content in unshelled peanuts is also possible with microwave measurements

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