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Microwave Moisture Meter for Rapid and Nondestructive Grading of Peanuts

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  1009183.(doi:10.13031/2013.29823)
Authors:   Samir Trabelsi , Micah A Lewis, Stuart O Nelson
Keywords:   Moisture meter, rapid testing, nondestructive measurements, peanut grading, dielectric properties, microwave measurements, density-independent moisture testing, bulk density, moisture content.

A low-cost microwave moisture meter made with off-the-shelf components was developed, calibrated and tested in the laboratory and in the field for the grading of peanuts. The meter allows rapid and nondestructive determination of kernel moisture content from measurements on unshelled peanut pods. The meter operates at a frequency of 5.8 GHz and uses the principle of free-space transmission measurement of the dielectric properties. Moisture content is determined independent of bulk density with a permittivity-based algorithm. Besides kernel moisture content, the meter provides simultaneously, from the same set of dielectric measurements, the bulk density and moisture content of the peanut pods.

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