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Determination of Peanut Pod and Kernel Moisture Contents by RF Impedance Measurements
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 036198, 2003 ASAE Annual Meeting . (doi: 10.13031/2013.13924) @2003
Authors: Chari V.K. Kandala
Keywords: Peanuts, Moisture content, RF Impedance
Moisture content (mc) of individual peanut kernels, Arachis hypogaea L., was earlier
determined by measuring the complex impedance of a parallel-plate capacitor with a kernel held
between the plates. The method was based on measuring the capacitance, dissipation factor, and/or
phase angle of a parallel-plate capacitor with a single peanut between the plates at 1.0 and 4.5 MHz.
These values were used in an empirical equation to calculate the mc of the kernels ranging between
5 and 15% moisture. The calculated mc values were within 1% of the air-oven values for 90% of the
kernels tested and were independent of kernel size.