An electromagnetic prospecting instrument for subsurface conducting zones |
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| Authors: | Dharmajit G Sarma Sakti K Biswas |
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| Institution: | (1) National Geophysical Research Institute, Hyderabad-7, India;(2) Geophysics Division, Geological Survey of India, Calcutta-16, India |
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| Abstract: | Summary A portable electromagnetic prospecting unit comprising a transmitter, receiver and resolver, designed and constructed to operate with a vertical setup of coils at a single frequency of 1250 cps, measures the components of the magnetic field at the receiver station resolved  in phase and at quadrature with field near the transmitter. This may be used to locate vertical or steeply dipping conductors down to a depth of about 0.6 times the maximum workable transmitter receiver separation of 120 meters, the accuracy of measurements of the resolved components being better than 2%. The variation of resolved components over a buried conductor indicates its position and depth.This paper is published by the kind permission of the Director General, Geological Survey of India. |
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