Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By aerial survey
Patent
1980-03-11
1983-01-04
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
By aerial survey
324335, G01V 3165, G01V 310
Patent
active
043674399
ABSTRACT:
The secondary signals induced in the receiver coils of two or three transmitter-receiver coil-pairs flown over terrain to be surveyed are combined to provide additional data relating to the terrain. One of the coil-pairs is arranged in a whaletail configuration, and the other or others in standard and/or fishtail configurations. The inphase and/or quadrature secondary whaletail and standard or fishtail signals are combined in such a manner as to cancel responses due to conductive overburden and distributed magnetite, and the whaletail and standard (or fishtail) signals are compared to differentiate anomalies caused by thin and thick steeply dipping conductive layers.
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Andrieux et al., Electromagnetic Soundings on Coastal Permafrost Geophysics, vol. 41; No. 2, Apr. 1976, p. 338.
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