Dynamic BOTDA-based multi-core cycle series-connection fiber-shaped sensor

A multi-core fiber and sensor technology, applied in instruments, optical devices, measuring devices, etc., can solve problems such as inability to real-time sensing, and achieve the effect of improving stability and reliability

Active Publication Date: 2019-09-17
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Patent CN103438927B uses multi-core optical fiber as a distributed sensor device, but it only uses multiple cores of multi-core optical f

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  • Dynamic BOTDA-based multi-core cycle series-connection fiber-shaped sensor
  • Dynamic BOTDA-based multi-core cycle series-connection fiber-shaped sensor
  • Dynamic BOTDA-based multi-core cycle series-connection fiber-shaped sensor

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Embodiment

[0032] In order to obtain 3D shape sensing, distributed bending and torsional sensing are required simultaneously. On multi-core fiber, this goal can be achieved by using Brillouin Optical Time Domain Analysis Technology (BOTDA). For this reason, the present invention provides a multi-core circulating series-connected optical fiber shape sensor used in a dynamic BOTDA system. The sensor uses multi-core optical fiber. This kind of multi-core fiber can have many forms: (1) a multi-core fiber with multiple cores arranged symmetrically on the circumference, and the number of cores N≥3, such as figure 1 (a) The three-core optical fiber shown; (2) a multi-core optical fiber with an intermediate core and multiple cores distributed around the circumference of the intermediate core, the number of cores N≥4, such as figure 1 Four-core optical fiber and seven-core optical fiber shown in (b) and (c); (3) spiral multi-core optical fiber in which peripheral cores are helically distributed...

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Abstract

The invention provides a dynamic BOTDA-based multi-core cycle series-connection fiber-shaped sensor. The fiber-shaped sensor comprises a multi-core fiber, a single-mode fiber and multi-core fiber Fan-in device, a single-mode fiber and multi-core fiber Fan-out device and a plurality of single-mode fibers, wherein the plurality of single-mode fibers are connected between the Fan-in device and the Fan-out device. By a mode of sequentially and circularly connecting a plurality of fiber cores of a multi-core fiber in series, the function of expanding the plurality of fiber cores to form a one-dimensional topological optical path is achieved. The fiber-shaped sensor can used for a shape sensing device of a dynamic BOTDA sensing system, can be widely used for monitoring health of an intelligent structure and also can be used for a stressed skin structure of a robot or an airplane wing, and the shape change thereof is detected in real time.

Description

[0001] (1) Technical field [0002] The present invention relates to a dynamic BOTDA-based multi-core cycle-connected optical fiber shape sensor, which can be used for health monitoring of intelligent structures, and can also be used for skin structures of robots or aircraft wings to detect their shape changes in real time and belong to distributed Type optical fiber deformation sensing technology field. [0003] (2) Background technology [0004] Optical fiber deformation sensing is a distributed sensing technology, which uses the backscattering signal generated by the local strain of the optical fiber to detect the bending and twisting of the optical fiber, and then processes the information to reconstruct the spatial deformation of the optical fiber. This technology has a wide range of applications in the fields of medical care, energy, national defense, aerospace, structural safety monitoring, and other smart structures. In the field of aerospace, fiber optic smart structu...

Claims

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Application Information

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IPC IPC(8): G01B11/24G01B11/16
CPCG01B11/16G01B11/24
Inventor 苑立波杨世泰徐荣辉
Owner GUILIN UNIV OF ELECTRONIC TECH
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