Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1985-03-08
1987-03-31
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324 57R, 324 61P, 324 65P, 324347, 324449, G01R 2702, G01V 306, G01N 2702
Patent
active
046545980
ABSTRACT:
A soil probe, comprising, in one form, a cylindrical member of insulating material having a pair of metal, electrically conductive, ring electrodes mounted a short distance above a conical portion at the lower end of the probe, these ring electrodes lie flush with the outer surface of the cylindrical member and are spaced apart from each other by the insulating material. An electrical-electronic measuring system is connected to the electrodes by conductors providing identical line impedance for each ring. The system has an initial electronic portion inside the cylindrical member and close to the electrodes and has a second portion distant from the cylindrical member. A plurality of different frequencies of radio-frequency current is applied to the electrodes, for accurate determination of capacitance at the different frequencies. Therefrom are determined the dielectric dispersion characteristics of the soil. A soil probe with three electrodes in a cylindrical tube can be used to predict the stress-strain behavior in situ and properties such as .lambda., .kappa., and M from such measured properties and (A.sup.2 /f), .DELTA..epsilon., and (e.sub.1 /e.sub.t) versus .kappa..
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Arulanandan Kandiah
Arulanandan Shiva
Strecker Gerard R.
The Regents of the University of California
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