...Ali Fares; Mohammad Safeeq; Ripendra Awal; Samira Fares; Ahmet Dogan Abstract Reliable and accurate monitoring of soil water content (θ) across the landscape is indispensable for many water resources applications. Capacitance-based in situ soil water content measuring devices are extensively used...

...H.G.M. van den Elsen; C.J. Ritsema; M. Seeger; S.D. Keesstra Abstract The averaging behavior of two capacitance water content sensors in nonuniform wetted sand samples was assessed and compared with the averaging behavior of a time domain reflectometry (TDR) water content sensor in identical...

...Ole Wendroth; Susmitha Nambuthiri; R. Jason Walton Abstract For long-term studies on spatiotemporal processes of soil water focusing on spatial variability at the field scale, appropriate calibration techniques for capacitance sensors are lacking. In an ideal case, soil water content samples would...

...Carlos M. Regalado; Axel Ritter; Rosa M. Rodríguez-González Abstract Among different alternatives, dielectric capacitance sensors may provide simultaneous readings of the volumetric water content and the soil solution electrical conductivity in the same sample volume at low cost. Reliability...

...-resistant container equipped with custom tools for heating and mixing the fluid, removing air bubbles from sensitive surfaces, measuring permittivity in situ, and creating an axisymmetric metal disturbance to the electric field. Total capacitance C was measured using a vector network analyzer (VNA...

...D. A. Robinson; T. J. Kelleners; J. D. Cooper; C. M. K. Gardner; P. Wilson; I. Lebron; S. Logsdon Abstract Soils ranging in texture from sand to clay were used to compare permittivity measurements made using a Surface Capacitance Insertion Probe (SCIP) and time domain reflectometer (TDR...

...V. Polyakov; A. Fares; M. H. Ryder Abstract Capacitance sensors have improved substantially in the last decades, resulting in their wide acceptance. A new generation of multisensor capacitance systems (MCS) is now available that are easy to install and use. Calibration of capacitance sensors...

... of these techniques rely on a limited set of calibration equations obtained through laboratory analysis of homogeneous soil materials (i.e., sand, silt, and clay). The accuracy of two capacitance-based soil water probes was assessed for a range of Coastal Plain soils. The probes measure capacitive and conductive soil...

...A. Fares; P. Buss; M. Dalton; A. I. El-Kadi; L. R. Parsons Abstract Multisensor capacitance sensors (MCS) are now popular alternatives to neutron scattering (NS) soil water–monitoring devices. The objectives of this study were to (i) quantify the effect of clay shrinkage–swelling on the soil bulk...

... adsorption increased with increasing solution pH, reached a maximum around pH 9, and decreased with further increases in solution pH. The constant capacitance model was able to describe B adsorption on the soil samples as a function of both solution B concentration and solution pH simultaneously...

... work showing decreasing fractional adsorbed B with decreasing pH in the range 7 to 9. K d varied from 2.5 to 4.7 at θ g = 1.5 because of variation of the equilibrium constants in the constant capacitance model ( K − and K + ) with varying soil texture. K d increased with increasing sodicity of the soil...

...Oliver Kuras; David Beamish; Philip I. Meldrum; Richard D. Ogilvy Abstract Capacitive resistivity (CR) is an emerging geophysical technique designed to extend the scope of the conventional methodology of dc resistivity to environments where galvanic coupling is notoriously difficult to achieve...

...Oliver Kuras; Philip I. Meldrum; David Beamish; Richard D. Ogilvy; Deepak Lala Abstract The capacitive resistivity (CR) technique is a generalization of the conventional DC resistivity method that facilitates measurements of electrical resistivity on engineered surfaces and highly resistive ground...

... collection using MER is much slower, 30–152 m per hour, and more costly than GPR. Historically capacitively coupled resistivity (CCR) has been of limited use in Florida due to the shallow water table and the time necessary to make multiple passes to collect resistivity data at depth. However...

...Qifei Niu; Yu-Hsing Wang ABSTRACT The capacitively coupled resistivity method using line antennas (or electrodes) has been widely applied for various kinds of applications. To solve the associated inversion problem, the general practice (i.e., the indirect inversion method) for 2D surface...

...Xavier Dérobert; Géraldine Villain; Jean-Paul Balayssac ABSTRACT This paper addresses the effect of concrete carbonation on the propagation and dispersion of electromagnetic (EM) waves and the capability of two EM, non-destructive techniques to detect this pathology. A capacitive technique...

...Qifei Niu; Yu-Hsing Wang ABSTRACT The capacitively coupled (CC) resistivity method is an emerging geophysical technique for near-surface investigations. However, there are two major problems associated with using the CC resistivity (line antenna) system in ground investigations. These two problems...

... Mineralogical Society of America 2015 Melting curve high pressure capacitive current in situ electrical method sodium chloride Simon equation Kraut-Kennedy equation Lindemann’s law Figure 3 Fittings of experimental data to melting equations. Results from this study ( Table 1 ) are shown...