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Core-by-core scanning type multi-core optical fiber shape sensor based on dynamic BOTDA (Brilouin Optical Timedomain Analysis)

A multi-core optical 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 increasing sensitivity, improving stability and reliability, and obviously highly integrated

Inactive 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 fiber as multiple transmission channels, which plays the role of multiple measurements, and cannot be used for real-time sensing of shapes

Method used

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  • Core-by-core scanning type multi-core optical fiber shape sensor based on dynamic BOTDA (Brilouin Optical Timedomain Analysis)
  • Core-by-core scanning type multi-core optical fiber shape sensor based on dynamic BOTDA (Brilouin Optical Timedomain Analysis)
  • Core-by-core scanning type multi-core optical fiber shape sensor based on dynamic BOTDA (Brilouin Optical Timedomain Analysis)

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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). Therefore, the present invention provides a core-by-core scanning multi-core optical fiber shape sensor for 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 in a circle 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 around the middle core. For convenienc...

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Abstract

The invention provides a core-by-core scanning type multi-core optical fiber shape sensor based on dynamic BOTDA (Brilouin Optical Timedomain Analysis). The core-by-core scanning type multi-core optical fiber shape sensor consists of a multi-core optical fiber, a multi-core optical fiber Fan-in device, a multi-core optical fiber Fan-out device, two optical switches and single-mode optical fibers for connecting each part. Both ends of the multi-core optical fiber are sequentially connected with the multi-core optical fiber Fan-in / out devices and the optical switches; and by control of two optical switches, an optical wave can scan core by core in each fiber core of the multi-core optical fiber so as to acquire respective deformation information of each fiber core. The core-by-core scanning type multi-core optical fiber shape sensor can be used for a shape sensing device of a dynamic BOTDA sensing system, can be widely used for health monitoring of an intelligent structure, and also can be used for a stressed-skin structure of a robot or a aircraft wing to detect shape changes of the stressed-skin structure in real time.

Description

[0001] (1) Technical field [0002] The invention relates to a dynamic BOTDA-based scanning multi-core optical fiber shape sensor, which can be used for health monitoring of intelligent structures, and can also be used for the skin structure of robots or aircraft wings to detect its shape changes in real time, which belongs 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 structures have b...

Claims

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Application Information

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