Dielectric determination of moisture of cereals grain using time domain reflectometry*
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| Authors: | M. Malicki1, J. Kotliński1 1Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland |
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| Abstract : | Abstract. The usefulness of time domain reflectometry, TDR, for moisture of cereal grain was examined. TDR was applied to determine the moisture dependent relative dielectric constant, e, of the samples. A relationship between gravimetric moisture on wet basis, Θ, and relative dielectric constant was investigated for wheat, rape, vetch, barley, Triticale and maize. Obtained results showed a linear Θ(Ѵε) relationship, with intercept and slope varying from one species to another. Fitting a regression line to the Θ(Ѵε) data set for each particular species resulted in a coefficient of regression R = 0.9959 and standard deviation SD=0.0097 at best, and R = 0.9795 and SD = 0.0211 at worst case. Fitting the regression line to the aggregated Θ(Ѵε) data set, comprising all species together, resulted in R = 0.9595 and SD = 0.0289. Thus, it was concluded that TDR could be a convenient technique to estimate the gravimetric moisture of grain with no specific calibration needed if readings of moderate aceuracy were sufficient. |
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| Keywords : | time domain reflectometry, TDR, cereal grain moisture determination | ||||||||
| Language : | English | ||||||||