In: Journal of Hydrology and Hydromechanics, vol. 58, no. 2
Willibald Loiskandl - Graeme Buchan - Wolfgang Sokol - Viliam Novak - Margarita Himmelbauer
Rok, strany: 2010, 114 - 125
Soil Moisture Probes, Electromagnetic Probes, TDR, Calibration.
URL originálneho zdroja: http://www.ih.savba.sk/jhh
The use of electromagnetic (EM) soil moisture probes is proliferating rapidly, in two broad domains: in field and laboratory research; and in strongly practical applications such as irrigation scheduling in farms or horticultural enterprises, and hydrological monitoring. Numerous commercial EM probes are available for measurement of volumetric water content (?v), spanning a range of measurement principles, and of probe dimensions and sensing volumes. However probe calibration (i.e. the relationship of actual ?v to probe electrical output) can shift, often substantially, with variations in parameters such as soil texture, organic matter content, wetness range, electrical conductivity and temperature. Hence a single-valued, manufacturer- supplied calibration function is often inadequate, forcing the user to seek an application-specific calibration. The purpose of this paper is to describe systematic procedures which probe users can use to check or re-determine the calibration of their selected probe(s). Given the wide diversity of operating principles and designs of commercially-available EM probes, we illustrate these procedures with results from our own calibrations of five different short probes (length of 5 to 20 cm). Users are strongly recommended to undertake such calibration checks, which provide both a) pre-use experience, and b) more reliable in-use data.
Loiskandl, W., Buchan, G., Sokol, W., Novak, V., Himmelbauer, M. 2010. CALIBRATING ELECTROMAGNETIC SHORT SOIL WATER SENSORS. In Journal of Hydrology and Hydromechanics, vol. 58, no.2, pp. 114-125. 0042-790X (until 2019) .
Loiskandl, W., Buchan, G., Sokol, W., Novak, V., Himmelbauer, M. (2010). CALIBRATING ELECTROMAGNETIC SHORT SOIL WATER SENSORS. Journal of Hydrology and Hydromechanics, 58(2), 114-125. 0042-790X (until 2019) .