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Three-dimensional shape sensing monitoring method and system based on multi-core optical fiber

A multi-core optical fiber and three-dimensional shape technology, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of not being able to truly and accurately reflect the three-dimensional shape vector change of the structure, temperature cross-sensitivity, and difficult layout, etc., and achieve light weight , small environmental impact, the effect of suppressing the interference of ambient temperature

Inactive Publication Date: 2020-04-17
BEIJING INST OF AEROSPACE CONTROL DEVICES
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  • Abstract
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Problems solved by technology

[0003] For the application of three-dimensional shape perception, demodulation, and reconstruction of the structure to be measured, the scalar measurement method of the conventional circular symmetric optical fiber has its own limitations, and cannot truly and accurately reflect the vector change of the three-dimensional shape of the structure; To monitor the vector change of the three-dimensional shape, it is greatly affected by the strain field-deformation model of the structure to be measured, and the cross-sensitivity of temperature, and there are problems such as low measurement accuracy and difficult layout.

Method used

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  • Three-dimensional shape sensing monitoring method and system based on multi-core optical fiber

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Embodiment 1

[0044] The invention discloses a three-dimensional shape perception monitoring method based on multi-core optical fiber, such as figure 1 A typical multi-core fiber is shown, when the fiber is bent and deformed, such as figure 2 As shown, taking the neutral plane of the fiber as the plane of symmetry, the strain of the fiber core is determined by the curvature of the fiber and the distance between the fiber core and the neutral plane. Such as Figure 3-4 As shown, according to the strain difference between different cores of the multi-core fiber, the curvature and bending direction of the fiber at the cross-section position can be calculated; further, as Figure 5 As shown, the three-dimensional shape sensing can be realized by spatial curve and surface reconstruction methods.

[0045] In this example, if Figure 6 , the three-dimensional shape perception monitoring method based on multi-core optical fiber, including:

[0046] In step 101, the measured strains of all fibe...

Embodiment 2

[0086] On the basis of the above embodiments, the present invention also discloses a multi-core optical fiber-based three-dimensional shape sensing monitoring system, including: an acquisition module, used to acquire the strain measured by all fiber gratings on each measurement section of the multi-core optical fiber; The inversion module is used to invert the curvature and bending direction of each measurement section according to the obtained strains measured by all fiber gratings on each measurement section; the interpolation encryption processing module is used to calculate the The curvature is interpolated and encrypted to obtain the curvature function of each measurement section; the vector expression building block is used to bring the curvature function of each measurement section into the Frenet equation group to obtain the vector expression of each measurement section; the iteration module is used to According to the vector expression of each measurement section, the ...

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Abstract

The invention discloses a three-dimensional shape sensing monitoring method and system based on a multi-core optical fiber, and the method comprises the steps: obtaining the strain measured by all fiber gratings on each measuring section of the multi-core optical fiber, and obtaining the curvature and bending direction of each measuring section through inversion; performing interpolation and encryption processing on the curvature of each measuring section according to the measuring section interval to obtain a curvature function of each measuring section; substituting the curvature function ofeach measuring section into a Frenet equation set to obtain a vector expression of each measuring section; performing iterative operation according to the vector expression of each measuring sectionto obtain a central coordinate of each measuring section; and performing three-dimensional shape reconstruction according to the central coordinates of each measuring section, and determining the three-dimensional shape of a to-be-measured structure. According to the method, the key technical problems of three-dimensional shape autonomous sensing and diagnosis, curvature demodulation, three-dimensional shape reconstruction and the like are solved, and the requirements of future structural environment sensing and shape self-adaptive active control can be met.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a multi-core optical fiber-based three-dimensional shape perception monitoring method and system. Background technique [0002] The 3D shape sensing technology with autonomous perception capability is an important support for future environment perception and shape adaptive active control. The 3D shape sensing technology based on optical fiber perception has become one of the most potential shape sensing solutions due to its advantages of light and small size, easy implantation inside the structure, anti-electromagnetic interference, good stability, and high reliability. [0003] For the application of three-dimensional shape perception, demodulation, and reconstruction of the structure to be measured, the scalar measurement method of the conventional circular symmetric optical fiber has its own limitations, and cannot truly and accurately reflect the ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 梅影唐才杰蓝天杨潇君朱晓非李瑞艳杜瑞
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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