Cable comprising twisted sinusoid for use in distributed sensing
First Claim
1. A fiber optic cable for a fiber optic distributed acoustic sensing assembly, comprising:
- an elongate body; and
a first optical fiber longitudinally housed in said body, wherein the fiber defines a sinusoid having an amplitude and a first wavelength, wherein the sinusoid passes through a length axis of said body, and wherein the sinusoid rotates about the length axis of the body and wherein the sinusoid rotates along the length of the body so as to define a twisted sinusoid having a twist wavelength.
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Accused Products
Abstract
A distributed fiber optic cable comprises an elongate body and a first optical fiber longitudinally housed in the body, wherein the fiber describes a sinusoid having an amplitude and a first wavelength along the length of the body and wherein the sinusoid rotates along the length of the body so as to describe a twisted sinusoid having a twist wavelength. A method for sensing an acoustic wave comprises a) providing a set of signals collected from the cable, b) processing the signals so as to divide the fiber in each twist wavelength of cable into a predetermined number of channels, c) measuring the amplitudes in each channel and calculating the maximum and minimum amplitude in a preselected length of cable, d) using the calculated maximum and minimum for the preselected length of cable to determine the amplitude and direction of the wave at the preselected length of cable.
36 Citations
11 Claims
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1. A fiber optic cable for a fiber optic distributed acoustic sensing assembly, comprising:
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an elongate body; and a first optical fiber longitudinally housed in said body, wherein the fiber defines a sinusoid having an amplitude and a first wavelength, wherein the sinusoid passes through a length axis of said body, and wherein the sinusoid rotates about the length axis of the body and wherein the sinusoid rotates along the length of the body so as to define a twisted sinusoid having a twist wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification