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High-sensitivity three-dimensional strain detection structural body based on optical fiber grating space quadrature

A high-sensitivity fiber grating technology, applied in measuring devices, optical devices, instruments, etc., can solve the problem of low pressure sensitivity coefficient of bare fiber gratings

Pending Publication Date: 2019-07-16
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pressure sensitivity coefficient of bare fiber Bragg grating is very low, in order to make the pressure measurement of fiber Bragg grating can be used in practice, people have done a lot of research on the pressure sensitivity of fiber Bragg grating

Method used

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  • High-sensitivity three-dimensional strain detection structural body based on optical fiber grating space quadrature
  • High-sensitivity three-dimensional strain detection structural body based on optical fiber grating space quadrature
  • High-sensitivity three-dimensional strain detection structural body based on optical fiber grating space quadrature

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Embodiment Construction

[0011] The specific implementation of the present invention is described in detail below in conjunction with accompanying drawing:

[0012] Such as figure 1 and figure 2 As shown, 1. Fiber Bragg Grating 1, 2. Fiber Bragg Grating 2, 3. Fiber Bragg Grating 3, 4-1. Column 1, 4-2. Column 2, 4-3. Column 3, 4-4. Column 4, 4-5. Column 5, 4-6. Column 6, 5 fiber optic connector, 6. armored optical cable, 7 cube hollow shell.

[0013] Choose QSn4-0.3 as the cubic hollow shell material, place the left and right ends of three fiber Bragg gratings in the corresponding grooves, and evenly coat the optical fiber with 353ND glue.

[0014] Suppose the relationship between the strain of the optical fiber and the strain of the sensor is

[0015] ε j =αε' j

[0016] where ε j (j=x, y, z) is the axial strain of the fiber Bragg grating.

[0017] and ε' j It can be obtained by changing the characteristic wavelength of the fiber Bragg grating, that is,

[0018] ε' j =Δλ B / λ B (1-P)

...

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Abstract

The invention discloses a high-sensitivity three-dimensional strain detection structural body based on optical fiber grating space quadrature. The high-sensitivity three-dimensional strain detection structural body is composed of a cubic hollow shell, a shore, three optical fiber Bragg grating, an armored optical cable and an optical fiber joint; two ends of each of three optical fiber Bragg gratings are adhered and fixed in the grooves of the supporting shores so as to measure various axial strains; the cubic hollow shell can drive the shore to move on an axial direction when being extruded to deform; if the X-axle direction is pressed, the optical fiber Bragg grating 1 can be shrunk if the X-axle direction is pressed, other two optical fiber Bragging gratings stretch on respective axialdirection, the direction of the optical fiber Bragg grating 1 characteristic wavelength change is opposite to the characteristic wavelength change directions of other two optical fiber Bragg gratings,thereby forming two groups of differential motion structures; the strain sensitivity is improved, and the strain transmission efficiency is improved through the method of transmitting the external stress through the shores.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensing, in particular to a high-sensitivity three-dimensional strain detection structure based on optical fiber grating space orthogonality. Background technique [0002] Affected by factors such as geological structure, lithological characteristics, and original rock stress field, the rock mass is mostly in a complex stress state where multi-directional stresses act together. Common disasters and accidents in coal mines, such as roof collapse, roadway deformation, rock burst, and coal and gas outburst, are mostly caused by the difficulty or delay in obtaining these mechanical information. Through certain surrounding rock stress detection methods, the coal and rock stress can be grasped in time. The internal three-dimensional stress state and its changing law are one of the effective means to reduce the occurrence of such accidents. [0003] Fiber Bragg Grating sensing element is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/165
Inventor 刘月明孔嘉浩刘玉婵
Owner CHINA JILIANG UNIV