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Distributed brillouin sensing systems and methods using few-mode sensing optical fiber

A technology of optical fiber and guided mode, applied in the field of distributed Brillouin sensing system, can solve the problems of expensive, high attenuation of single-mode optical fiber, and increase the additional cost and complexity of the sensing system

Inactive Publication Date: 2016-04-27
CORNING INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, polarization-maintaining single-mode fiber typically has higher attenuation and is more expensive than standard fiber
Furthermore, the sensing scheme required for single-mode fiber systems that maintain polarization maintains the components of the polarization, which adds additional cost and complexity to the sensing system
Furthermore, it is difficult to maintain a given polarization over long optical fibers (i.e., several kilometers or more), which limits the length of the sensor system

Method used

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  • Distributed brillouin sensing systems and methods using few-mode sensing optical fiber
  • Distributed brillouin sensing systems and methods using few-mode sensing optical fiber
  • Distributed brillouin sensing systems and methods using few-mode sensing optical fiber

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Embodiment Construction

[0044] Reference will be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, like reference numbers will be used to refer to like parts or portions. Cartesian coordinates are shown in some figures for reference.

[0045] In the following discussion, as well as in the claims, references to "first guided mode" and "second guided mode" do not necessarily refer to the lowest and first order guided modes, respectively, but are more generally intended to refer to the available guided modes A different one of the .

[0046] Also in the following discussion, the following definitions and technical terms commonly used in the art are adopted.

[0047] Refractive Index Profile: The refractive index profile is the relationship between the relative refractive index percentage (Δ%) and the fiber radius r (measured from the fiber centerline) over a selected portion of the fiber.

[0048] Relative refra...

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Abstract

A distributed Brillouin optical fiber sensing system employs a sensing optical fiber that supports two or more (i.e., few) guided modes. Pump light supported by one of the guided modes is used to form a dynamic Brillouin grating (DBG). Probe light supported by at least one of the other guided modes interacts with the DBG to form reflected probe light that is received and analyzed to determine a Brillouin frequency shift and a reflection location, which in turn allows for making a measurement of at least one condition along the sensing optical fiber. Supporting the pump and probe light in different guided modes results in the optical fiber sensing system having a higher spatial resolution than sensing systems where the pump light and probe light share a common guided mode.

Description

[0001] The patent application of the present invention is an application for an invention patent entitled "Distributed Brillouin Sensing System and Method Using Few-Mode Sensing Optical Fiber" with an international filing date of April 11, 2012 and a Chinese national phase application number of 201280021083.1. Divisional application. [0002] Related Application Cross Reference [0003] This application claims the benefit of priority to U.S. Application Serial No. 13 / 097,201, filed April 29, 2011, and U.S. Application Serial No. 13 / 344,065, filed January 5, 2012, the entire contents of which applications is relied upon and incorporated herein by reference. field of invention [0004] The present disclosure relates generally to sensing systems and methods, and more particularly to distributed Brillouin sensing systems and methods using few-mode sensing fibers. Background technique [0005] Distributed sensors based on Brillouin scattering are attractive for forming fiber op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/165G01K11/322G01K11/32G01L1/246
Inventor 李明军李沈平X·王
Owner CORNING INC