INDUCTIVE METHOD OF DETERMINATION OF VARIATIONS OF ELECTRIC RESISTANCE OF GEOLOGICAL MEDIUM Russian patent published in 1997 - IPC

FIELD: electromagnetic methods of examination of the Earth, investigation of resistance of ground in nonconductive surface layer (permafrost, rocks, etc). SUBSTANCE: after setting of receiving frame into position corresponding to registration of minor axis of polarization ellipse there is used additional compensating frame uniaxial to receiving one. Current from it is formed proportional to vertical component of magnetic field. Strength of compensating current is changed to value at which maximal compensation of minor axis of polarization ellipse is achieved. Variation of electric resistance of geological medium is found by value of change of compensating current. EFFECT: enhanced authenticity of inductive method. 2 dwg