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.
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References
D. Gupta Sarma,A Portable Electromagnetic (Inductive) Prospecting Instrument, Proc. Symposium on Geophysical Exploration, Council of Scientific and Industrial Research, India (1963), 122.
S. N. Saha andS. K. Biswas,Some results of electromagnetic prospecting over a S. P. anomaly zone in Ambaji area of Gujrat State, J. Indian Geophysical Union2 (1964), 99.
E. M. Hedstorm andD. S. Parasnis,Some model experiments relating to electromagnetic prospecting with special references to airborne work, Geophys. Prospecting4, (1958), 322.
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This paper is published by the kind permission of the Director General, Geological Survey of India.
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Sarma, D.G., Biswas, S.K. An electromagnetic prospecting instrument for subsurface conducting zones. PAGEOPH 62, 124–128 (1965). https://doi.org/10.1007/BF00875293
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DOI: https://doi.org/10.1007/BF00875293