Electromagnetic geophysical surveying system

Details Electromagnetic geophysical surveying system Electromagnetic geophysical surveying system

G - Physics

01

V

324/12

G01V 3/12 (2006.01) G01V 3/10 (2006.01)

Patent

CA 1133058

ABSTRACT A frequency domain geophysical electromagnetic surveying system is provided in which intermittent primary fields having sharp terminations are generated in a cycle having a fundamental frequency by a transmitter, and a receiver includes a gate passing only secondary signals received during interruptions of the primary field, the gated signal being applied to filters tuned to harmonics of the predetermined frequency. The filter outputs are synchronously demodulated to provide signals corresponding to at least the in-phase component of the secondary signal at the fundamental frequency, and preferably in-phase and quadrature components at at least two harmonics. The system can provide improved resolu- tion particularly of the characteristics of in-phase secondary signals received from terrain being surveyed.

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