Fiber-integrated interferometer series structure three-dimensional space distributed deformation sensor

A technology of deformation sensor and series structure, which is applied in the direction of instruments, measuring devices, optical devices, etc., can solve the problems of spectrum demodulation and aliasing at detection points, and achieve the elimination of temperature cross-sensitivity effects, improve high temperature resistance, and eliminate temperature The effect of cross-sensitivity effects

Active Publication Date: 2021-04-06
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

The disadvantage is that when the number of long-chirped fiber gratings increases, the spectral demodulation of the detection point is prone to aliasing

Method used

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  • Fiber-integrated interferometer series structure three-dimensional space distributed deformation sensor
  • Fiber-integrated interferometer series structure three-dimensional space distributed deformation sensor
  • Fiber-integrated interferometer series structure three-dimensional space distributed deformation sensor

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Comparison scheme
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Embodiment

[0034] Example: figure 1 It is a structural schematic diagram of a fiber-integrated interferometer series structure three-dimensional space distributed deformation sensor, and it is also a specific implementation mode of the sensor.

[0035] In order to analyze the optical path difference of the four fiber cores of the helical quadruple fiber 2-1 due to bending, the establishment of Figure 5 The reference coordinates of the shown helical quadruple-core optical fiber 2-1 in a bent state. For the curved coordinate system of the helical four-core fiber 2-1 in the figure, it is assumed that the length from the thermal coupling of the helical four-core fiber 2-1 to the end face of the four-core fiber is L, and the outer three cores 2-1b / 2-1c / 2- The distance from 1d to the central core 2-1a is r.

[0036] The optical path calculation is determined by the following formula:

[0037] L=n eff l (3)

[0038] In the formula, L is the scanning distance of the translation stage, n e...

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Abstract

The invention discloses a fiber-integrated interferometer series structure three-dimensional space distributed deformation sensor, the main feature of which is: the sensor is composed of a double-clad optical fiber 1 and a spiral multi-core optical fiber 2 in series, and is integrated on one optical fiber 3D space distributed deformation sensor. The sensor provided by the present invention is a multi-core optical fiber sensor array with a distributed three-dimensional space structure, which corresponds to the measurement of discrete strain information and curvature information, and is reconstructed by fitting and reconstructing the three-dimensional shape of the structural space by demodulating these information , so as to establish the mapping relationship between the arm length displacement parameter of the white light interference sensor array and the sensed three-dimensional shape of space. Due to the inherent characteristics of the invention, it can work normally even under high temperature conditions. In addition, the sensor also has the advantages of high sensitivity, compact structure and low cost.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a three-dimensional space distributed deformation sensor with a series structure of fiber integrated interferometers. [0003] (2) Background technology [0004] Optical fiber deformation sensing is a distributed sensing technology, which uses the backscattering signal generated by the local deformation of the optical fiber to measure bending and twisting, and then calculates and processes the information to reconstruct the three-dimensional spatial deformation information of the optical fiber. . Based on this, this technology has broad application prospects in the fields of medical treatment, national defense, aerospace and other intelligent structure detection. [0005] In 1979, the National Aeronautics and Space Administration (NASA) proposed to implant fiber optic sensors into the composite skin of the aircraft to construct intelligent str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 苑立波李文超
Owner GUILIN UNIV OF ELECTRONIC TECH
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