Distributed acoustic monitoring via time-sheared incoherent frequency domain reflectometry
AssigneeBaker Hughes Incorporated
InventorsRoger Glen Duncan, Matthew Thomas Raum
Life of this patent
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Abstract
A system and method to obtain an acoustic signal from a borehole penetrating the earth are described. The system includes a modulated single frequency incoherent light source to output a modulated light signal. The system also includes two or more optical fibers to split the modulated light signal for transmission to an optical sensor in the borehole, at least one of the two or more optical fibers including a delay, two or more photodetectors to receive respective resultant signals resulting from the two or more optical fibers transmitting the modulated light signal to the optical sensor, and a processor to obtain the acoustic signal based on the resultant signals.
Claims14
A system to obtain an acoustic signal from a borehole penetrating the earth, the system comprising:
- a modulated single frequency incoherent light source to output a modulated light signal;
- two or more optical fibers to split the modulated light signal for transmission to an optical sensor in the borehole, at least one of the two or more optical fibers including a delay;
- two or more photodetectors to receive respective resultant signals resulting from the two or more optical fibers transmitting the modulated light signal to the optical sensor;
- and
- a processor to obtain the acoustic signal based on the resultant signals.
A method of obtaining an acoustic signal from a borehole penetrating the earth, the method comprising:
- modulating a single frequency incoherent light source to output a modulated light signal;
- disposing two or more optical fibers to receive and split the modulated light signal;
- adding a delay in at least one of the two or more optical fibers;
- transmitting, through each of the two or more optical fibers, the modulated light signal to an optical sensor in the borehole;
- receiving, with two or more photodetectors, respective resultant signals resulting from the two or more optical fibers transmitting the modulated light signal to the optical sensor;
- and
- processing the resultant signals to obtain the acoustic signal.
Dependencies are inferred from the claim text.