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Radio Frequency Measurements for Sensing Moisture In Small Samples of Peanuts

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

Citation:  Paper number  036130,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13915) @2003
Authors:   Chari V.K. Kandala, Stuart O Nelson
Keywords:   Moisture content, RF Impedance, Small samples, Peanuts

A method developed earlier for estimating the moisture content of single peanut kernels from radio-frequency impedance measurements on a parallel-plate capacitor, holding the kernel between the plates, was used for estimating the moisture content of small samples of 6 to 8 kernels. Parallel plates with a larger surface area to accommodate the small samples were used for the measurements, and a new moisture calibration equation was developed. Capacitance, phase angle, and dissipation factor were measured for the parallel-plate system with an impedance analyzer at 1 and 5 MHz. By using these values in the moisture calibration equation, moisture contents of the small samples were predicted successfully to within 1% of their air-oven reference values for over 85% of peanut samples tested with moisture contents ranging between 6% and 20%, wet basis.

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