Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1990-08-01
1992-12-29
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324345, G01V 308, G01V 3165, G01V 338
Patent
active
051755009
ABSTRACT:
Terrain resistivity is mapped by collecting data as to the vertical magnetic field ratio along a survey line by VLF survey techniques, and precision integrating rather than differentiating the data obtained. The received VLF signal is demodulated and low-pass filtered in a manner such as to preserve the DC component of the demodulated signal, and is then digitized and spatially integrated to obtain pseudo-resistivity readings along the survey line.
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Edmonds Warren S.
Geonics Limited
Strecker Gerard R.
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