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Samir Trabelsi, Stuart O. Nelson
On the Accuracy of Bulk Density and Moisture Content Prediction in Wheat from Near-Field Free-Space Measurements
Keywords: near field, far field, attenuation, phase shift, Dielectric properties
Bulk density and moisture in wheat predicted from near-field, free-space measurement at 5.8GHz with a pair of inexpensive microstrip antennas are compared to those predicted from measurement in the far field with a pair of sophisticated focused-beam, horn/lens antennas. Results of five different calibration algorithms for bulk density and moisture content determination from microwave measurements indicate that predictions from near-field measurements with microstrip antennas compare well with those derived from far-field measurements with horn/lens antennas. Computation of corresponding standard errors of calibration (SEC) indicates that the accuracy with which each entity can be determined remains within an acceptable range.
tm – Technisches Messen, Oldenbourg Wissenschaftsverlag
Print ISSN: 0171-8096
Volume: 74, 05/2007
Pages: 280 - 289