DISTRIBUTED VIBRATION SENSING SYSTEM USING MULTIMODE FIBER
First Claim
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1. An optical time domain reflectometry (OTDR) system, comprising:
- a multimode sensing optical fiber;
an optical source configured to output a pulse of light for launching into the multimode sensing optical fiber;
an optical detector; and
a single spatial mode filtering system coupled between the multimode sensing optical fiber and the optical detector, the single spatial mode filtering system configured to select for detection by the optical detector a single speckle of Rayleigh backscattered light produced by the multimode sensing optical fiber in response to the pulse of light.
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Abstract
An optical time domain reflectometry (OTDR) system is configured to detect Rayleigh backscatter reflected from a multimode sensing optical fiber. The system includes a single spatial mode filtering system to select a single speckle of the Rayleigh backscatter produced in response to an optical pulse launched into the multimode fiber. The detected single speckle may be used for distributed disturbance (vibration) detection.
57 Citations
20 Claims
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1. An optical time domain reflectometry (OTDR) system, comprising:
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a multimode sensing optical fiber; an optical source configured to output a pulse of light for launching into the multimode sensing optical fiber; an optical detector; and a single spatial mode filtering system coupled between the multimode sensing optical fiber and the optical detector, the single spatial mode filtering system configured to select for detection by the optical detector a single speckle of Rayleigh backscattered light produced by the multimode sensing optical fiber in response to the pulse of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for sensing a disturbance to an elongate structure, comprising:
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providing a multimode sensing optical fiber disposed proximate the elongate structure; launching a pulse of light into the multimode sensing optical fiber; selecting a single speckle of Rayleigh backscattered light produced by the multimode sensing optical fiber in response to the pulse of light; and generating a signal indicative of a disturbance to the elongate structure based on the selected single speckle. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of retrofitting an optical time domain reflectometry (OTDR) installation having a multimode sensing optical fiber deployed proximate an elongate structure, an optical source for launching a pulse of light into the multimode sensing optical fiber, and an optical detector for detecting Rayleigh backscattered light produced by the multimode sensing optical fiber in response to the launched pulse of light, the method comprising:
coupling a single spatial mode filtering system between the multimode sensing optical fiber and the optical detector, wherein the single spatial mode filtering system is configured to select a single speckle of the Rayleigh backscattered light produced by the multimode sensing optical fiber in response to the launched pulse of light. - View Dependent Claims (18, 19, 20)
Specification