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    ACOUSTIC SENSING SYSTEM FOR DOWNHOLE SEISMIC APPLICATIONS UTILIZING AN ARRAY OF FIBER OPTIC SENSORS
    7.
    发明专利
    ACOUSTIC SENSING SYSTEM FOR DOWNHOLE SEISMIC APPLICATIONS UTILIZING AN ARRAY OF FIBER OPTIC SENSORS 未知

    公开(公告)号：CA2320453A1

    公开(公告)日：2001-04-29

    申请号：CA2320453

    申请日：2000-09-21

    Applicant: LITTON SYSTEMS INC

    Inventor： HODGSON CRAIG W ,  FREDERICK DONALD ,  KNAACK WILLIAM C ,  ROSCIGNO JOHN A

    IPC: G01H9/00 ,  G01V1/52 ,  G01V1/40 ,  G08C19/36

    Abstract: A system for sensing subterranean acoustic waves emitted from an acoust ic source includes a plurality of laser sources, a plurality of subterranean optical sensors, at least one optical detector, and electronics. The laser sources each emit light at a different frequency. The subterranean optical sensors receive the light and alter the light in response to the acoustic waves. The optical detector receives the altered light and outputs an electrical signal. The electronics receives the electrical signal and converts it into seismic data format. Preferably, the light emitt ed from the optical sources is modulated at a plurality of modulation frequencies. The electronics can be used to demodulate the signal. The electronics may demodulate the electrical signal by mixing the signal with periodic waveforms having frequencies corresponding to the modulation frequencies and twice the modulation frequencies. The modulation frequencies are selected such that at least one of the second harmonic frequencies associated with the modulation frequencies is interleaved in a non-interfering manner within the corresponding set of firs t harmonic frequencies. Preferably, the modulation frequencies are selected su ch that at least one of the first harmonic frequencies is interleaved in a non- interfering manner within the corresponding set of modulation frequencies.

    ACOUSTIC SENSING SYSTEM FOR DOWNHOLE SEISMIC APPLICATIONS UTILIZING AN ARRAY OF FIBER OPTIC SENSORS
    10.
    发明专利
    ACOUSTIC SENSING SYSTEM FOR DOWNHOLE SEISMIC APPLICATIONS UTILIZING AN ARRAY OF FIBER OPTIC SENSORS 未知

    公开(公告)号：CA2320394A1

    公开(公告)日：2001-04-29

    申请号：CA2320394

    申请日：2000-09-21

    Applicant: LITTON SYSTEMS INC

    Inventor： KNAACK WILLIAM C ,  ROSCIGNO JOHN A

    IPC: G01H9/00 ,  G01V1/52 ,  G01V1/40 ,  G01V1/28 ,  G08C19/36

    Abstract: A system for sensing subterranean acoustic waves emitted from an acoust ic source includes a plurality of laser sources, a plurality of subterranean optical sensors, at least one optical detector, and electronics. The laser sources each emit light at a different frequency. The subterranean optical sensors receive the light and alter the light in response to the acoustic waves. The optical detector receives the altered light and outputs an electrical signal. The electronics receives the electrical signal and converts it into seismic data format. Preferably, the light emitt ed from the optical sources is modulated at a plurality of modulation frequencies. The electronics can be used to demodulate the signal. The electronics may demodulate the electrical signal by mixing the signal with periodic waveforms having frequencies corresponding to the modulation frequencies and twice the modulation frequencies. The modulation frequencies are selected such that at least one of the second harmonic frequencies associated with the modulation frequencies is interleaved in a non-interfering manner within the corresponding set of firs t harmonic frequencies. Preferably, the modulation frequencies are selected su ch that at least one of the first harmonic frequencies is interleaved in a non- interfering manner within the corresponding set of modulation frequencies.

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