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Stability and Type-Independence Analysis of Density-Independent Calibration Functions for Microwave Moisture Sensing in Unshelled and Shelled Peanuts

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

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009857.(doi:10.13031/2013.30001)
Authors:   Micah A Lewis, Samir Trabelsi, Stuart O Nelson, Ernest W Tollner
Keywords:   Dielectric properties, Moisture content, Shelled peanuts, Unshelled peanuts, Microwave Sensing, Complex permittivity, Free space measurements

Free-space-transmission measurements were used to measure the relative complex permittivities of shelled and unshelled peanuts of various types at 23C between 5 and 15 GHz. Moisture content was estimated with three different calibration functions and compared to standard oven moisture determinations: two of these functions are permittivity-based, and the other is expressed in terms of attenuation and phase shift. The stability of these three functions for individual peanut types and type-independence was evaluated over broad ranges of frequency, moisture content and bulk density. Coefficients of determination and standard errors of calibration are presented for each function.

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