Reflective multi-core circular fiber optic shape sensor

A multi-core optical fiber and reflective technology, which is applied in the field of reflective multi-core circularly connected shape sensors, can solve the problems of real-time sensing and other problems, and achieve the effect of improving stability and reliability

Active Publication Date: 2020-11-06
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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  • Reflective multi-core circular fiber optic shape sensor
  • Reflective multi-core circular fiber optic shape sensor
  • Reflective multi-core circular fiber optic shape 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). To this end, the invention provides a reflective multi-core circular fiber optic 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 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 three or more circumferentially distributed peripheral cores, 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 convenience, the following content and drawings use a four...

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Abstract

The invention provides a reflective multi-core cyclic concatenated fiber shape sensor consisting of a multi-core fiber, a three-port circulator, a multi-core fiber Fan-out device, a mirror at one end of the multi-core fiber, and a single-mode fiber that connects the various sections. The light pulse outputted by the BOTDA is led out by the single-mode fiber and enters a branch a of the multi-core fiber Fan-out device after passing through the three-port circulator, a core of the multi-core fiber is input, the light wave backtracks along the same core after being transmitted to the mirror at the end surface of the multi-core fiber for reflection and enters a branch b of the multi-core fiber Fan-out device after passing through the branch a of the multi-core fiber Fan-out device and the three-port circulator, a second core of the multi-core fiber is input for transmission, and the respective cores of the multi-core fiber are sequentially and cyclically connected in series to realize the function of mapping the plurality of cores into a one-dimensional topological optical path. The reflective multi-core cyclic concatenated fiber shape sensor provided by the invention is applicable to shape sensor devices for dynamic BOTDA sensing systems.

Description

[0001] (1) Technical field [0002] The invention relates to a reflective multi-core circularly connected 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 its shape changes in real time, and belongs to distributed optical fiber deformation transmission. 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 been applied to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/18
Inventor 苑立波杨世泰徐荣辉
Owner GUILIN UNIV OF ELECTRONIC TECH
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