Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Sample Geometry, Temperature and Density Factors in the Microwave Measurement of Moisture [PDF]
AUTHORS	J. Mladek and Z. Beran 1980 15 4 243-250
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Abstract The analysis of a specimen geometry from the point of view of the accuracy of microwave measurements of the moisture content is presented. Relations for the calculation of the length and width of the sample are given and optimum dimensions of the antenna aperture are specified in terms of the dielectric properties of the test materials. Effects of the temperature and material density of samples are discussed, including their compensation. Examples of calculations and some experimental data for the moisture measurement of selected foodstuffs and agricultural products (wheat, flour, starch, egg powder, etc.) performed in the X-band are also presented. Selection of optimum conditions for measuring moisture content on the basis of microwave attenuation of the test material is possible.