Method for remote measurement of anomalous complex variations of

Details Method for remote measurement of anomalous complex variations of Method for remote measurement of anomalous complex variations of

1981-12-28

1985-03-19

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324330, 328165, G01V 308, G01V 3165, G01V 316

Patent

active

045062250

ABSTRACT:
According to the method, a primary electromagnetic field, defined by a waveform of known shape and containing a plurality of frequency components, is directed towards a target zone. Signals are received in the vicinity of the target zone which are attributable to eddy currents in conductors present in the target zone and direct coupling with the primary field. A reference signal having a complex waveform similar to that of the primary field is generated artificially and the reference signal is compared with the received signals in a digital computer in such a manner as to minimize the amount of signal present in the received signal which is attributable to direct coupling with the primary field. The resulting received signal may then be correlated with a plurality of stored reference waveforms in order to obtain the best fit.

REFERENCES:
patent: 2527559 (1950-10-01), Lindblad et al.
patent: 2542462 (1951-02-01), Beard
patent: 2929984 (1960-03-01), Puranen et al.
patent: 3105934 (1963-10-01), Barringer
patent: 3108220 (1963-10-01), Ruddock
patent: 3801896 (1974-04-01), Duroux et al.
patent: 3852659 (1974-12-01), Barringer
patent: 3950695 (1976-04-01), Barringer
patent: 3967190 (1976-06-01), Zonge

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