Downhole spread spectrum induction instruments

Details Downhole spread spectrum induction instruments Downhole spread spectrum induction instruments

2011-07-05

2011-07-05

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

C324S335000

Reexamination Certificate

active

07973532

ABSTRACT:
A plurality of transmitters on a logging tool are activated simultaneously at substantially the same frequency. When the transmitter outputs are phase-modulated using a mutually orthogonal set of modulating functions, it is possible to recover, from the signal at each receiver, a response corresponding to each of the transmitters.

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