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An Automated Approach to Peanut Drying with Real-time Monitoring of In-Shell Kernel Moisture Content with a Microwave Sensor

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

Citation:  2012 Dallas, Texas, July 29 - August 1, 2012  121337870.(doi:10.13031/2013.41841)
Authors:   Micah A Lewis, Samir Trabelsi, Stuart O Nelson, Ernest W Tollner, Mark A Haidekker
Keywords:   Data acquisition, Dielectric properties, Embedded system, Feedback controller, In-shell kernel moisture content, Microwave sensing, Moisture content, Peanut drying, Sensor network, Shelled peanuts, Unshelled peanuts

Todays peanut drying processes utilize decision support software based on modeling and require substantial human interaction for moisture sampling. These conditions increase the likelihood of peanuts being overdried or underdried. This research addresses the need for an automated controller with real-time, in-shell kernel moisture content determination capabilities. By using a microwave moisture meter, developed within USDA ARS, the moisture content of the peanut kernel can be determined without having to shell the peanut pod. The kernel moisture content and atmospheric conditions serve as inputs to the controller, and thus, air temperature and drying time are controlled automatically. Such implementation reduces overdrying and underdrying, preserves quality of peanuts, and minimizes energy consumption through efficient control of the heater. In this paper, a quarter-scale drying system with automated control is discussed. Results show promise for large-scale implementation and testing.

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