Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1970-10-08
1976-09-21
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 30B, G01V 306, G01N 2704, G01R 2700
Patent
active
039821773
ABSTRACT:
A method of measuring at low frequency the electrical conductivity of a hrogeneous soil sample contained in an electrically insulating soil container or cell having at least two, or a colinear array of three or more, chemically inert probes or electrodes wherein the soil cell first is calibrated using a standard solution of known conductivity to obtain a cell constant k for each pair of probes. The cell constant for a given pair of probes is the product of the resistance measured between said pair of probes and the known conductivity of the solution. This cell constant is representative of the factor 1/a in a formula for resistance R = .rho. 1/a of a material where .rho. is the resistivity of the material between adjacent probes, 1 is the length of the material -- substantially equal to the probe spacing -- and a is the cross-sectional area of the material through which the current flows between the pair of probes under consideration. The cell constant thus obtained is applied to subsequent soil measurements for any number of such soil samples. The solution now is emptied from the cell. The cell is then filled with a soil sample and the resistance of various combinations of two-terminal networks, each including a pair of probes and the soil disposed therebetween, is measured. The resistance of the soil measured between a given pair of probes is divided by the aforesaid cell constant for that pair of probes to determine the conductivity of the soil disposed between said pair of probes without having to measure the size and shape of either the soil cell or the heterogeneous soil sample contained therein.
REFERENCES:
patent: 2583284 (1952-01-01), Wyllie et al.
patent: 2613250 (1952-10-01), Bilhartz et al.
patent: 2875401 (1959-02-01), Owen
patent: 2914725 (1959-11-01), Carter et al.
Pearce Douglas C.
Walker John W.
Edelberg Nathan
Murray Jeremiah G.
Sharp Daniel
Strecker Gerard R.
The United States of America as represented by the Secretary of
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