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Acousto-optical marine sensor array

  • US 5,051,965 A
  • Filed: 04/19/1985
  • Issued: 09/24/1991
  • Est. Priority Date: 04/19/1985
  • Status: Expired due to Fees
First Claim
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1. An acousto-optical seismic sensor array, comprising:

  • first and second elongated optical fibers;

    a plurality of directional optical couplers;

    a plurality of separated portions of said first optical fiber being wound as multi-turn pressure-sensing coils;

    said first optical fiber being coupled to said second optical fiber by said directional optical couplers at a plurality of points along said first optical fiber, the points being intermediate said separated pressure-sensing coils;

    a source means for launching a substantially monochromatic radiation pulse into one end of said first optical fiber;

    a beam splitter coupled to said second optical fiber for equally dividing radiation pulses between first and second optical branches of said second optical fiber;

    a delay line coupled into said first optical branch to retard in time a radiation pulse propagating along said first optical branch by an amount equal to the radiation-pulse propagation delay time between any two consecutive pressure-sensing coils; and

    demodulator means coupled to said first and second branches of said second optical fiber for measuring the relative phase shift between a received radiation pulse that propagated through any one pressure-sensing coil and the same radiation pulse received after having propagated through the immediately preceding pressure-sensing coil;

    said beam splitter and said delay line being located between said plurality of directional optical couplers and said demodulator means.

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