Microwave moisture measurement of grains

Author

King, Ray J. ; King, Karl V. ; Woo, K.

Author_Institution

KDC Technol. Corp., Livermore, CA, USA

Volume

41

Issue

1

fYear

1992

fDate

2/1/1992 12:00:00 AM

Firstpage

111

Lastpage

115

Abstract

A two-parameter transmission technique is described for online, in situ measurement of the bulk moisture content of grains using microwaves. This noncontacting 4.9-GHz system is configured so that a well-collimated TEM beam is transmitted through a layer of grain, e.g., moving on a conveyer or flowing in a chute. The changes in attenuation and phase serve as two independent measurement parameters from which the wet and dry basis weights (grams per square centimeter) and moisture can be found using a linear model, independent of the layer thickness. If the layer thickness is also known, the wet and dry densities (grams per cubic centimeter) and complex dielectric constant can be found

Keywords

microwave measurement; moisture measurement; permittivity measurement; 4.9 GHz; TEM beam; attenuation; bulk moisture content; chute; complex dielectric constant; conveyer; dry density; grains; in situ measurement; linear model; microwave measurement; moisture measurement; online; phase; thickness; two-parameter transmission technique; wet density; Attenuation measurement; Density measurement; Dielectric constant; Dielectric measurements; Instruments; Microwave measurements; Microwave theory and techniques; Moisture measurement; Phase measurement; Thickness measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.126643

Filename

126643