New calibration technique for microwave moisture sensors

Author

Trabelsi, Samir ; Kraszewski, Andrzej W. ; Nelson, Stuart O.

Author_Institution

US Dept. of Agric., Athens, GA, USA

Volume

50

Issue

4

fYear

2001

fDate

8/1/2001 12:00:00 AM

Firstpage

877

Lastpage

881

Abstract

A new calibration technique was developed for implementation with microwave moisture sensors. The calibration permittivity function used for this purpose allows computation of moisture content in granular materials with significant differences in shape, dimensions, and composition, independent of bulk density and with temperature compensation. A 3D representation is used to plot the calibration permittivity function as it depends on temperature and moisture content in wheat and corn. For each material, data points form a plane surface. These planes have nearly the same coefficients, which can be utilized for the development of a “universal” calibration method for moisture sensing in natural and manufactured granular materials. Foundations of the method are discussed based on results obtained for wheat and corn over a wide temperature range and at moisture contents of practical interest

Keywords

calibration; compensation; granular materials; humidity sensors; microwave measurement; moisture measurement; permittivity measurement; 3D representation; calibration technique; corn; granular materials; microwave moisture sensors; moisture content; permittivity function; temperature dependence; universal calibration; wheat; Calibration; Composite materials; Manufacturing; Microwave sensors; Microwave theory and techniques; Moisture; Permittivity; Shape; Temperature dependence; Temperature sensors;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.948292

Filename

948292