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    SEISMIC OPTICAL ACOUSTIC RECURSIVE SENSOR SYSTEM
    4.
    发明专利
    SEISMIC OPTICAL ACOUSTIC RECURSIVE SENSOR SYSTEM 未知

    公开(公告)号：CA2342639A1

    公开(公告)日：2000-03-09

    申请号：CA2342639

    申请日：1999-09-01

    Applicant: INPUT OUTPUT INC

    Inventor： SIEMS LEE E ,  KNAPP GREYSON ,  MAIDA JOHN

    IPC: G01H3/00 ,  G01H9/00 ,  G01V1/20

    Abstract: A marine seismic fiber optic acoustic sensor system having internal mirrors (14) with a low reflectivity written into the fiber (12) to form a series of continuous, linear sensors (16) incorporated in a single fiber, each sensor bounded by a pair of internal mirrors. A pulsed laser (20) provides optical signals to the fiber at a pulse width less than twice the travel time to assure that there will be no phase or frequency modulation of signals return ed from the sensors and reflected optical energy is returned through the same fiber to an optical coupler (24) where it is input to a compensating interferometer to produce interference signals which are then time division multiplexed to produce signals corresponding to acoustic signals received by each mirror bound sensor. Calibration to remove local temperature effects is provided by using a desensitized reference fiber with internal mirrors identical to the sensitized fiber, by a piezoelectric stretcher built into t he fiber or any other conventional calibration technique.

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