Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1998-06-17
1999-08-03
Regan, Maura
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324637, 324690, G01R 2726
Patent
active
059330155
ABSTRACT:
A method and apparatus for measuring in-place soil density and moisture content. A cylindrical cell is disclosed which may be used to measure the density and the dielectric constant of a soil sample placed within the cylindrical cell. Also disclosed is a multiple rod probe which is designed to contact spikes driven into the ground to measure the in-place dielectric constant of soil. The multiple rod probe includes adjustable studs which ensure complete contact with the spikes. Both measurements are performed using time domain reflectometry. The present invention develops equations for determining the density of the soil in-place from the measured dielectric constant of the soil in-place and the measured density and dielectric constant of the soil in the cylindrical cell.
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Topp, G.C.; "Electromagnetic Determination of Soil Water Content: Measurements in Coaxial Transmission Lines"; Water Resources Research, vol. 16, No. 3, Jun. 1980, pp. 574-582.
Zegelin, S.J.; "Improved Field Probes for Soil Water Content and Electrical Conductivity Measurement Using Time Domain Reflectometry"; Water Resources Research; vol. 25, No. 11, Nov. 1989, pp. 2367-2376.
Drnevich Vincent P.
Siddiqui Shafiqul I.
Purdue Research Foundation
Regan Maura
LandOfFree
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