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Grain and Seed Moisture and Density Measurement through Sensing of Dielectric Properties

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

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008521.(doi:10.13031/2013.29637)
Authors:   Stuart O Nelson, Samir Trabelsi Nelson
Keywords:   Grain, seed, moisture, bulk density, permittivity, dielectric constant, dielectric loss factor, microwave measurements

The importance of moisture measurement in grain and seed is discussed, and a brief history of the development of moisture sensing instruments, based on sensing of dielectric properties of these materials, is presented. Data are presented graphically on the permittivities or 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 on microwave measurements for moisture content and bulk density sensing are briefly described, and numerous studies are cited providing sources of information on these promising techniques.

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