Detecting broadside acoustic signals with a fiber optical distrubuted acoustic sensing (DAS) assembly
First Claim
1. A distributed fiber optic acoustic sensing system comprising:
- a cable comprising an elongated body having an outer surface and a first optical fiber disposed on the outer surface at a first predetermined wrap angle;
a first sheath layer on the outside of the elongated body and covering the elongated body and the first optical fiber;
at least a second optical fiber wrapped around the outside of the first sheath layer at a second predetermined wrap angle that is different from the first predetermined wrap angle;
a second sheath layer on the outside of the first sheath layer and covering the first sheath layer and the second optical fiber; and
light transmitting and receiving means optically connected to said optical fibers for, respectively, transmitting optical signals into the optical fibers and receiving a backscattered component of said signals out of the optical fibers.
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Accused Products
Abstract
A distributed fiber optic acoustic sensing system comprises an elongate body having an outer surface, an optical fiber disposed on the outer surface at a first predetermined wrap angle, and light transmitting and receiving means optically connected to the fiber for. The elongate body may include at least one substantially flat face, and/or a layer of swellable elastomer surrounding the body, and/or an outer elastomeric tube surrounding the elastomer layer. There may be at least one sensor pad disposed in the outer layer, the sensor pad comprising a stiffener and at least one longitudinal fiber affixed thereto or embedded therein. There may be a body of protective material surrounding the tube, which may have an outer surface that includes at least one substantially flat face and at least one sensor pad disposed in the body.
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Citations
15 Claims
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1. A distributed fiber optic acoustic sensing system comprising:
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a cable comprising an elongated body having an outer surface and a first optical fiber disposed on the outer surface at a first predetermined wrap angle; a first sheath layer on the outside of the elongated body and covering the elongated body and the first optical fiber; at least a second optical fiber wrapped around the outside of the first sheath layer at a second predetermined wrap angle that is different from the first predetermined wrap angle; a second sheath layer on the outside of the first sheath layer and covering the first sheath layer and the second optical fiber; and light transmitting and receiving means optically connected to said optical fibers for, respectively, transmitting optical signals into the optical fibers and receiving a backscattered component of said signals out of the optical fibers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification