METHOD OF SOIL RESISTIVITY TIME VARIATIONS MEASUREMENT Russian patent published in 2008 - IPC G01V3/02 

FIELD: physics.

SUBSTANCE: current is cutoff to soil through two point sources. The first source is placed close by vertical interface, and the second is taken to infinity. Position of one equipotential line of electric field is detected. Measuring electrodes is mounted by tangent to equipotential line symmetrically to tangency point of ray lined from auxiliary point presenting mirror reflection of point source relative to interface with specified equipotential. Besides, measuring electrodes can be placed by line, perpendicular to interface symmetrically to power supply provided close by interface. Near to interface there is compensatory point source with current value fixed by parity where I₀, I_k are currents from the first and compensatory sources, ΔΨ_1MN is differential of the space function that determinates position of measuring electrodes relative to the first source, ΔΨ_2MN is differential of space function that determinates position of measuring electrodes relative to compensatory source. Measuring electrodes voltage indicates time variations of resistivity.

EFFECT: simplified positioning of electrical survey unit and improved measurement accuracy.

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