Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1996-08-30
1998-09-01
Brock, Michael
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324354, G01N 2204, G01R 2726
Patent
active
058015370
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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Kotdawala, Shrinath J.; "Monitoring of Moisture Changes in Pavement Subgrades Using Time-Domain Reflectomtry", pp. 364-373, United States Bureau of Mines Symposium and Workshop on Time Domain Reflectometry in Environmental, Infrastructure, and Mining Applications, Sep. 7, 1994.
Rada, Gonzalo R.; "Monitoring of Subsurface Moisture in Pavements Using Time-Domain Reflectomtry", pp. 422-433, United States Bureau of Mines Symposium and Workshop on Time Domain Reflectometry in Environmental, Infrastructure, and Mining Applications, Sep. 7, 1994.
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.
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Drnevich Vincent P.
Siddiqui Shafiqul I.
Brock Michael
Purdue Research Foundation Office of Technology Transfer
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