Object shape reconstruction method and system based on fiber Bragg grating

Abstract

The invention discloses an object shape reconstruction method based on a fiber Bragg grating. The object shape reconstruction method based on the fiber Bragg grating comprises the following steps: (1)when the shape of an object to be measured changes, the center wavelength of the fiber Bragg grating is measured through a spectrum analyzer, and a wavelength drift measured by the spectrum analyzeris converted into a strain value; (2) the strain value is converted into a discrete curvature value; (4) the discrete curvature value of each sensing point is made to be continuous according to the space curve theory and spline interpolation theory; (5) the continuous bending curvature is substituted into the Frenet-serret equation; and (6) after a tangent vector is obtained, the indefinite integration is performed to obtain the curve shape of the object to be measured. The measurement accuracy of the object shape reconstruction method and system based on the fiber Bragg grating is improved; the object shape reconstruction method and system based on the fiber Bragg grating is suitable for measurement under the circumstance that the distance between adjacent fiber Bragg grating sensors is relatively long; and the object shape reconstruction method based on the fiber Bragg grating can save the number of fiber Bragg grating sensors needed to increase the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method and system for reconstructing the shape of an object based on an optical fiber Bragg grating. Background technique [0002] In recent decades, fiber optic shape sensing technology has attracted much attention due to its wide range of potential applications, such as medicine, architecture, aviation, and smart structural systems, including structural health monitoring in civil engineering, wearables for biomedical purposes, and Motion detection for equipment, and real-time sensing for soft robotic devices. Research on optical fiber shape sensors has been booming in the past decade. Due to its unique inherent advantages, compared with traditional electronic sensors, it has light weight, small size, low transmission loss for long-distance measurement, instant response, immunity to electromagnetic interference, chemical Inert and non-toxic, that is, excellent c...

AI Technical Summary

Problems solved by technology

However, the measurement methods using distributed fiber Bragg grating sensing technology in the prior art are generally only applicable to the situation where the distance between adjacent fiber Bragg grating sensors is relatively close

If the distance between adjacent Fiber Bragg Grating sensors is large, or the complexity of the shape to be measured increases, the existing measurement methods will have a greater impact on the measurement accuracy

If this situation is to be avoided, a large number of Fiber Bragg Grating sensors are required to make the distance between adjacent Fiber Bragg Grating sensors close enough, which will lead to increased investment costs

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