Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 147, Issue 2, Pages 544-552Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2008.06.015
Keywords
soil moisture; dielectric permittivity; time domain reflectometry
Funding
- European Regional Development Fund (ERDF)
- Ministry of Scientific Research and Information Technology in 2004-2007 [PBZ 18-KBN-098/T09/2003]
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Time domain reflectometry (TDR) probes are increasingly used for field and laboratory estimation of soil water content. Usual calibration of TDR probes for the determination of soil water content uses two media: air for low and water for high values of dielectric permittivity, although the measured range of dielectric permittivity in soil is much smaller as compared to the range implied by the calibration media. The use of air for calibration of short TDR probes gives calibration errors due to overlapping incident and reflected pulses in the reflectogram, which result in their relative shift in time. This phenomenon, named the convolution effect, can be avoided by the application of selected calibration media. The presented approach minimizes of dielectric permittivity measurement errors by choosing the calibration media with dielectric permittivity values close to the limits of the measurement range and the possibility to use TDR probes of various lengths. The comparison of errors of TDR apparent dielectric permittivity measurement in three sandy soils, based on the probe calibrations in various media, is also presented. (c) 2008 Elsevier B.V. All rights reserved.
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