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Seismic streamer communication system

  • US 4,912,684 A
  • Filed: 02/29/1988
  • Issued: 03/27/1990
  • Est. Priority Date: 02/29/1988
  • Status: Expired due to Term
First Claim
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1. For use in a seismic streamer system which includes a streamer cable along which one or more birds are disposed and having a signal line upon which signals are conveyed to the birds from a central unit and from the birds to the central unit, a communication system comprising:

  • a streamer circuit disposed in the streamer cable at the position of each bird and including;

    a first inductive coupling structure tuned to a predetermined resonant frequency and having pole faces confronting the wall of the streamer cable;

    circuit means connected to the first inductive coupling structure and operative to energize the structure in response to signals received from the signal line of the streamer cable and to provide signals to the signal line in response to signals received from the first inductive coupling structure; and

    a bird circuit disposed in each bird and including;

    a second inductive coupling structure tuned to the same resonant frequency as the first inductive coupling structure and having pole faces confronting the pole faces of the first inductive coupling structure; and

    circuit means connected to the second inductive coupling structure and operative in response to signals received by the second inductive coupling structure to provide power and data signals and to provide data signals to the second inductive coupling structure in response to sensor data provided by sensors in the bird,the first and second inductive coupling structures being in resonant coupling relationship for efficient transfer of power and data signals.

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