Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1984-08-20
1987-03-17
Lieberman, Eli
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
343719, H01Q 104, G01V 330
Patent
active
046511008
ABSTRACT:
Antenna apparatus for use in introducing electromagnetic energy into subsurface earth formations and acquiring measurements relating to propagation of such energy therethrough. Antenna construction includes a resonant cavity-backed slot, the cavity being filled with a fluid. The slot receives an insulator plug serving as a floating piston whereby pressure differentials between the cavity and the surrounding borehole are accommodated. A metallic strap within the cavity grounded at one end to the tool body interconnects at the other end to a matching and tuning feed network. A lumped element resonant circuit behind the slot is thereby formed for either radiating or receiving transmitted or received electromagnetic energy, respectively.
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Dresser Industries Inc.
Lieberman Eli
McCollum Patrick H.
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