Multi-core optical fiber three-dimensional shape sensing system based on OFDR technology

Abstract

The invention provides a multi-core optical fiber three-dimensional shape sensing system. The multi-core optical fiber three-dimensional shape sensing system comprises a magneto-optical switch, an auxiliary interferometer, three main interferometers, an optical fiber fan-out device, a data acquisition module and a data processing module. The magneto-optical switch is communicated with each port in a time division multiplexing mode; the auxiliary interferometer is used for generating an external clock signal; the optical fiber fan-out device is used for combining the three single-core optical fibers which are respectively connected with the three main interferometers into a multi-core optical fiber; the data acquisition module is used for acquiring beat frequency signals of the three main interferometers under the external clock signals; and the data processing module generates strain information of the three single-core optical fibers according to the signals acquired by the data acquisition module. On the basis of the sensing system provided by the invention, the three-dimensional shape of the optical fiber in the space can be reconstructed in real time under the condition that one single-mode multi-core optical fiber is used.

Description

technical field [0001] The present disclosure relates to the technical field of optical fiber sensing, in particular, to a multi-core optical fiber three-dimensional shape sensing system based on OFDR technology. Background technique [0002] Optical fiber sensing technology means that when light is transmitted in an optical fiber, the characteristics of light such as intensity, wavelength, phase, and frequency will change with changes in external stress and temperature; the optical signal is converted into an electrical signal, and a specific algorithm is used to analyze the digital signal. After the signal is demodulated, the changes in the outside world can be obtained, which can play the role of a sensor. Optical frequency domain reflectance (OFDR) distributed optical fiber sensing technology is a kind of optical fiber sensing technology. This technology uses the principle of spectral movement based on Rayleigh scattering and uses distance domain cross-correlation algori...

AI Technical Summary

Problems solved by technology

However, the data measured by the traditional OFDR system is one-dimensional strain, which can only represent the tensile or compressive deformation of the measured object. When the applied object is a three-dimensional object, the direction of its deformation cannot be judged, so it is impossible to analyze the three-dimensional object. Pose reconstruction in space

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