Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1988-07-14
1989-06-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324357, G01V 308, G01V 310
Patent
active
048375144
ABSTRACT:
A method for reducing noise in electromagnetic geophysical exploration data simultaneously measures three orthogonal components of the ambient noise to produce noise records and simultaneously measures three orthogonal components of the decay of current induced into the earth to produce response records. In measuring the records, the receiving antenna is positioned near the electromagnetic center of the transmitting antenna, whereby the maximum component of the induced current decay signal is vertical or perpendicular to the strata in the earth. The impulse response of the earth is determined from the noise records. The noise portion of the vertical response record is determined from the impulse response and the non-vertical response records, whereby the noise portion is removed from the vertical response record.
REFERENCES:
patent: 4247821 (1981-01-01), Buselli
1985--McMechan and Barrodale, "Processing Electromagnetic Data in the Time Domain", Geophys. J.R. Astr. Soc., pp. 177-293 (1985).
Atlantic Richfield Company
Eisenzopf Reinhard J.
Fails James C.
Mantooth Geoffrey A.
Snow Walter E.
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