Detecting broadside acoustic signals with a fiber optical distributed acoustic sensing (DAS) assembly
First Claim
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1. A distributed fiber optic acoustic sensing system comprising:
- a towed streamer cable having a cable length, the towed streamer cable comprising;
an elongated body having an outer surface;
at least one straight optical fiber extending parallel to a longitudinal axis of the towed streamer cable along the cable length; and
at least one helically wrapped optical fiber extending along the cable length and having a first predetermined wrap angle; and
light transmitting and receiving means optically connected to said at least one straight optical fiber and the least one helically wrapped optical fiber for, respectively, transmitting optical signals into each of the at least one straight and at least one helically wrapped optical fibers and receiving a backscattered component of said signals out of the at least one straight and at least one helically wrapped optical fibers.
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Abstract
A distributed fiber optic acoustic sensing system includes a cable having a cable length. The cable has an elongated body having an outer surface, and at least one straight optical fiber extending parallel to a longitudinal axis of the cable along the cable length; and one or more non-straight optical fibers, such as two orthogonal sinusoidal optical fibers extending along the cable length, or a helically wrapped optical fiber extending along the cable length. The sensing system further has light transmitting and receiving means optically connected to the optical fibers.
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Citations
17 Claims
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1. A distributed fiber optic acoustic sensing system comprising:
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a towed streamer cable having a cable length, the towed streamer cable comprising; an elongated body having an outer surface; at least one straight optical fiber extending parallel to a longitudinal axis of the towed streamer cable along the cable length; and at least one helically wrapped optical fiber extending along the cable length and having a first predetermined wrap angle; and light transmitting and receiving means optically connected to said at least one straight optical fiber and the least one helically wrapped optical fiber for, respectively, transmitting optical signals into each of the at least one straight and at least one helically wrapped optical fibers and receiving a backscattered component of said signals out of the at least one straight and at least one helically wrapped optical fibers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A distributed fiber optic acoustic sensing system comprising:
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a towed streamer cable having a cable length, the towed streamer cable comprising; an elongated body having an outer surface; at least one straight optical fiber extending parallel to a longitudinal axis of the towed streamer cable along the cable length; and at least two orthogonal sinusoidal optical fibers extending along the cable length; and light transmitting and receiving means optically connected to said at least one straight optical fiber and at least two orthogonal sinusoidal optical fibers for, respectively, transmitting optical signals into each of the at least one straight and at least at least two orthogonal sinusoidal optical fibers and receiving a backscattered component of said signals out of the at least one straight and at least at least two orthogonal sinusoidal optical fibers. - View Dependent Claims (12)
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13. A distributed fiber optic acoustic sensing system comprising:
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a cable having a cable length comprising; an elongated body having an outer surface; at least one straight optical fiber extending parallel to a longitudinal axis of the cable along the cable length; and at least one helically wrapped optical fiber extending along the cable length and having a first predetermined wrap angle; and light transmitting and receiving means optically connected to said at least one straight optical fiber and the least one helically wrapped optical fiber for, respectively, transmitting optical signals into each of the at least one straight and at least one helically wrapped optical fibers and receiving a backscattered component of said signals out of the at least one straight and at least one helically wrapped optical fibers; wherein the cable is an ocean bottom cable (OCB) deployed on the seabed.
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14. A distributed fiber optic acoustic sensing system comprising:
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a cable having a cable length, the cable comprising; an elongated body having an outer surface; at least one straight optical fiber extending parallel to a longitudinal axis of the cable along the cable length; and at least two orthogonal sinusoidal optical fibers extending along the cable length; and light transmitting and receiving means optically connected to said at least one straight optical fiber and at least two orthogonal sinusoidal optical fibers for, respectively, transmitting optical signals into each of the at least one straight and at least at least two orthogonal sinusoidal optical fibers and receiving a backscattered component of said signals out of the at least one straight and at least at least two orthogonal sinusoidal optical fibers; wherein the cable is an ocean bottom cable (OBC) deployed on the seabed.
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15. A distributed fiber optic acoustic sensing system comprising:
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a cable having a cable length, the cable comprising; an elongated body having an outer surface; at least one straight optical fiber extending parallel to a longitudinal axis of the cable along the cable length; and a first sinusoidal optical fiber extending in a first plane along the cable length; a second sinusoidal optical fiber extending along the cable length, wherein the second sinusoidal optical fiber defines a plane perpendicular to the first plane; and light transmitting and receiving means optically connected to said at least one straight optical fiber and the first and second sinusoidal optical fibers for, respectively, transmitting optical signals into each of the at least one straight and first and second sinusoidal optical fibers and receiving a backscattered component of said signals out of the at least one straight and first and second sinusoidal optical fibers. - View Dependent Claims (16, 17)
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Specification