A combined Wenner-array/heat dissipation sensor for measuring electric conductivity and moisture of soils.

J. A. Siqueira DIas, W. Roque, F. Pfrimer, E. Chagas Ferreira

Abstract


This paper presents the characterization results and proposes a technique for the compensation of measurement drifts observed in heat dissipation soil moisture sensors when repeated measurements with a small time interval (less than 15 minutes) is used. A heat dissipation sensor was fabricated using the center probes of a conventional electrical conductivity Wenner-array probe. Several experiments were conduct, using two types of soils, with different sampling frequency of data, from 5 to 15 minutes. It is observed that the drift of the measured values depends strongly on the type of soil, since for a clay loam soil the errors due to the repetition of measurements with short time intervals result in a much more humid soil indication than the correct value, while for a sandy loam exactly the opposite behavior is verified. Based on experimental measured data for each type of soil, it is proposed a correction technique to compensate for errors present in repeated measurements.

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