Signal processing apparatus for frequency domain geophysical ele

Details Signal processing apparatus for frequency domain geophysical ele Signal processing apparatus for frequency domain geophysical ele

1982-08-17

1985-10-01

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324336, G01V 310

Patent

active

045448922

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 resolution particularly of the characteristics of in-phase secondary signals received from terrain being surveyed.

REFERENCES:
patent: 2931973 (1960-04-01), Puranen
patent: 3315155 (1967-04-01), Colani
patent: 3538430 (1970-11-01), Bulgakov et al.
patent: 3555408 (1971-01-01), Robinson
patent: 3614600 (1971-10-01), Ronka
patent: 3737768 (1973-06-01), Lazenby et al.
patent: 3876930 (1975-04-01), Seigel
"Resolving Capabilities of the Inductive Methods of Electroprospecting" A. A. Kaufman, Geophysics, vol. 43, No. 7 (Dec. 1978), pp. 1392-1398.
"Applications of Transient Electromagnetic Techniques" J. D. McNeill, Technical Note TN-7, Geonics Limited, Oct. 1980.

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