Reflective multi-core circular fiber optic shape sensor

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 ...

AI Technical Summary

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

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