Summary
The basic theory of airborne EM surveying, in the time domain, is considered. Rather than resorting to tediousdouble numerical integration, a more direct approach is adopted. This method, valid in the quasi-static regime, is illustrated for a homogeneous flat earth. The results exhibit a number of clear-cut features that are relevant to remote sensing. For example, a vertical co-axial loop system has a desirable transient response from the standpoint of yielding conductivity data without requiring accurate information on the height of the device above the ground.
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References
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The research reported here was supported by AFCRL Contract No. PRO-Y-71-872.
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Wait, J.R., Ott, R.H. On calculating transient electromagnetic fields of a small current-carrying loop over a homogeneous earth. PAGEOPH 95, 157–162 (1972). https://doi.org/10.1007/BF00878864
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DOI: https://doi.org/10.1007/BF00878864