Title :
Calibration of a microwave system for measuring grain moisture content
Author :
Slima, Mohamed Ben ; Morawski, Roman Z. ; Kraszewski, Andrzej W. ; Barwicz, Andrzej ; Nelson, Stuart O.
Author_Institution :
Dept. d´´Ingenierie, Quebec Univ., Trois-Rivieres, Que., Canada
fDate :
6/1/1999 12:00:00 AM
Abstract :
This paper relates to a microwave system for grain moisture content determination which is based on simultaneous measurements of two parameters: attenuation and phase shift, of the electromagnetic wave transmitted through the layer of material. The calibration of such a system consists of identifying a function modeling the relationship between these parameters and the measured moisture content, taking into account an influence quantity-temperature T. Two algorithms for calibration are proposed and studied. The results of calibration show that the moisture of hard red winter wheat can be determined with uncertainty less than 0.5% moisture, at the 95% confidence level, in the moisture range of 10% to 19% at grain temperatures between -1°C and 42°C, independent of the grain bulk density
Keywords :
agriculture; attenuation measurement; calibration; microwave measurement; moisture measurement; network analysers; phase measurement; -1 to 42 C; agriculture; algorithms; attenuation measurement; calibration; grain moisture content determination; grain temperature; hard red winter wheat; microwave system; network analyser; phase shift measurement; simultaneous measurements; uncertainty; Attenuation measurement; Calibration; Electromagnetic measurements; Electromagnetic scattering; Microwave measurements; Microwave ovens; Microwave theory and techniques; Moisture measurement; Monitoring; Phase measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
