Click on “Download PDF” for the PDF version or on the title for the HTML version.


If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

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 www.asabe.org

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.

(Download PDF)    (Export to EndNotes)