Agricultural and Biosystems Engineering Publications

Campus Units

Agricultural and Biosystems Engineering, Human Computer Interaction

Document Type

Article

Publication Version

Published Version

Publication Date

2021

Journal or Book Title

Transactions of the ASABE

Volume

64

Issue

1

First Page

243

Last Page

252

Research Focus Area(s)

Biological and Process Engineering and Technology

DOI

10.13031/trans.13940

Abstract

The dielectric properties of biological materials are relevant when developing moisture content sensors. However, little is known about the permittivities of switchgrass and corn stover in a wider frequency range. The goal of this research was to determine their dielectric constants and loss factors at different moisture contents across a frequency range of 5 Hz to 13 MHz and with the material static and in motion inside a sample container. The permittivity of these materials was calculated by measuring their admittance in a test fixture using an impedance analyzer at three different moisture levels (9.0% to 30.5%). Overall, the materials‘ dielectric properties increased with moisture but decreased with frequency. Prediction models were developed using the data in a frequency range of 10 kHz to 5 MHz. Model coefficients of determination were higher than 0.90 in general, except for the model measuring the loss factor of switchgrass in motion. Additionally, the dielectric constant was not different with the materials static or in motion, but the loss factor values were distinct. This work can be used for the development of electrical moisture content sensors for switchgrass and corn stover.

Comments

This article is published as Souza, Augusto M., Stuart J. Birrell, and Brian L. Steward. "The Dielectric Properties of Switchgrass and Corn Stover at the Radio Frequency Range." Transactions of the ASABE 64, no. 1 (2021): 243-252. DOI: 10.13031/trans.13940. Posted with permission.

Copyright Owner

American Society of Agricultural and Biological Engineers

Language

en

File Format

application/pdf

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