The Response of a Coincident Loop Transient Electromagnetic System above a Uniform Earth

A.P. Raiche

doi:10.1071/EG978170

ISSN: 0812-3985
E-ISSN: 1834-7533

The Response of a Coincident Loop Transient Electromagnetic System above a Uniform Earth
Authors A.P. Raiche^a
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^a CSIRO Division of Mineral Physics, PO Box 136, North Ryde, , NSW, , 2113
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 9, Issue 4, Dec 1978, p. 170 - 172
DOI: https://doi.org/10.1071/EG978170
- Published online: 01 Dec 1978

Abstract

The response of a coincident horizontal loop transient electromagnetic (TEM) system is expected to decrease as the loop is lifted off the earth. This effect is calculated for a uniformly conducting earth for a range of loop heights, ground conductivities, loop sizes, and delay times. Within the assumptions of the model, the calculations are exact and valid for any height.

It is shown that signal attenuation with respect to height does not preclude the use of a helicopter TEM system. It is also shown that for ground TEM surveys where the loop is held off the ground because of brush, the maximum attenuation that could be expected from a uniform half space is less than 20%.

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1978-12-01

2026-01-21

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References

ABRAMOWITZ M. and STEGUN I. 1964 Handbook of Mathematical Functions, National Bureau of Standards Applied Mathematics Series, 1046 pp.
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LEE T. and LEWIS R. 1974 Transient response of a large loop on a layered ground, Geophys. Prospecting22, 430-444.
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Article Type: Research Article

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The Response of a Coincident Loop Transient Electromagnetic System above a Uniform Earth

Abstract

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