Abstract
A system for investigating subterranean strata. An electromagnetic field is applied using a fixed dipole antenna transmitter and this is detected using a dipole antenna receiver. The receiver is moved from one location to another in dependence upon the strength of the detected signal.
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CITATION STYLE
Ellingsrud, S., Eidesmo, T., Westerdahl, H., & Kong, F. N. (2002). Electromagnetic methods and apparatus for determining the content of subterranean reservoirs. US Patent 6,696,839. Retrieved from http://www.google.com/patents?hl=en&lr=&vid=USPATAPP10770115&id=M9KTAAAAEBAJ&oi=fnd&dq=Electromagnetic+methods+and+apparatus+for+determining+the+content+of&printsec=abstract
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