Title :
Grain permittivity measurements in free space
Author :
Kraszewski, A.W. ; Trabelsi, S ; Nelson, S.O.
Author_Institution :
U.S Department of Agriculture, Agricultural Research Service, Richard B. Russell Agricultural Research Center, Athens, GA 30604-5677, U.S.A
Abstract :
Requirements for a free-space microwave transmission measurement system for determining the permittivity of grain are analyzed. Experimental verification of these requirements is provided for two cultivars of hard red winter wheat of various densities, moisture contents and temperatures in the frequency range from 10 to 18 GHz. Uncertainties in the dielectric constant determination are less than ± 1%, and those for the loss factor are less than ± 3%.
Keywords :
Dielectric materials; Dielectric measurements; Extraterrestrial measurements; Frequency; Moisture; Permittivity measurement; Receiving antennas; Reflection; Reflector antennas; Transmitting antennas;
Conference_Titel :
Microwave Conference, 1995. 25th European
Conference_Location :
Bologna, Italy
DOI :
10.1109/EUMA.1995.337080
