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Dual-parameter optical fiber sensor for temperature and stress based on coaxial optical fiber

A technology of optical fiber sensor and coaxial optical fiber, which is applied in the direction of physical/chemical change thermometers, thermometers, and measurement of the change force of optical properties of materials when they are stressed, to achieve good performance consistency, simple preparation process, The effect of good compatibility

Inactive Publication Date: 2011-11-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of these technical solutions is that it is inevitable to use some complex optical fiber sensor head processing technologies in the production process, such as special ultraviolet light writing, chemical corrosion, mechanical polishing, sensor head coating and other processes

Method used

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  • Dual-parameter optical fiber sensor for temperature and stress based on coaxial optical fiber
  • Dual-parameter optical fiber sensor for temperature and stress based on coaxial optical fiber
  • Dual-parameter optical fiber sensor for temperature and stress based on coaxial optical fiber

Examples

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Effect test

Embodiment 1

[0021] see figure 1 , the temperature and stress dual-parameter optical fiber sensor based on coaxial optical fiber, including single-mode input optical fiber 1, first coaxial optical fiber 2, middle single-mode optical fiber 3, second coaxial optical fiber 4 and single-mode output optical fiber 5 connected in sequence, It is characterized in that the single-mode input optical fiber 1, the first coaxial optical fiber 2 and the intermediate single-mode optical fiber 3 are sequentially welded by an optical fiber fusion splicer to form the No. 1 sensing unit with a resonant filter transmission spectrum; the intermediate single-mode optical fiber 3, the second coaxial optical fiber The optical fiber 4 and the single-mode output optical fiber 5 are sequentially fused by an optical fiber fusion splicer to form the No. 2 sensing unit with a resonant filter transmission spectrum.

Embodiment 2

[0023] see figure 1 , this embodiment is basically the same as Embodiment 1, and the specific structure is described in detail as follows.

[0024] see figure 1 , the structure of this embodiment consists of five parts: single-mode input optical fiber 1, first coaxial optical fiber 2, middle single-mode optical fiber 3, second coaxial optical fiber 4 and single-mode output optical fiber 5, wherein the first coaxial optical fiber 2 And the second coaxial optical fiber 4 has a double-clad structure, in the first coaxial optical fiber 2, the refractive index of the core 6 and the outer cladding 7 is higher than the refractive index of the inner cladding 8, in the second coaxial optical fiber 4, the core 9 and the refractive index of the outer cladding 10 are higher than the refractive index of the inner cladding 11, although both coaxial optical fibers have a double cladding structure, their inner cladding doping material, inner cladding thickness and inner cladding refracti...

Embodiment 3

[0026] see figure 2 , the structure of this embodiment consists of five parts: single-mode input optical fiber 1, first coaxial optical fiber 2, middle single-mode optical fiber 3, second coaxial optical fiber 4 and single-mode output optical fiber 5, wherein the first coaxial optical fiber 2 and the second coaxial optical fiber 4 have a three-clad structure, in the first coaxial optical fiber 2, the refractive index of the core 6 and the outer cladding 7 is higher than the refractive index of the first cladding 8 and the third cladding 23, the second In the coaxial optical fiber 4, the refractive index of the core 9 and the outer cladding 10 is higher than the refractive index of the first cladding 11 and the third cladding 24, although both coaxial optical fibers have a triple cladding structure, but they The first cladding and second cladding doping materials, inner cladding thicknesses and refractive index values ​​of the inner cladding are different, therefore, they ...

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Abstract

The invention relates to a coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor which is formed by sequentially connecting a single mode input optical fiber, a first coaxial optical fiber, an intermediate single mode optical fiber, a second coaxial optical fiber and a single mode output optical fiber, wherein the single mode input optical fiber, the first coaxialoptical fiber and the intermediate single mode optical fiber are sequentially welded to form a first sensing unit; and the intermediate single mode optical fiber, the second coaxial optical fiber andthe single mode output optical fiber are sequentially welded to form a second sensing unit. The first coaxial optical fiber and the second coaxial optical fiber have different structural parameters, the first sensing unit and the second sensing unit have resonance filtering spectrums with different wavelengths; and the two resonance filtering spectrums have different sensitivities for two parameters, namely the temperature and the stress, thereby the dual-parameter optical fiber sensor can be realized. The coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor disclosed by the invention has the advantages of simple preparation process, low cost, compact structure, stable performance, easiness for integration with a standard single mode optical fiber system,and the like.

Description

technical field [0001] The invention relates to a temperature and stress dual-parameter optical fiber sensor based on a coaxial optical fiber, which belongs to the application field of optical fiber sensing technology. Background technique [0002] Temperature and stress are the two most important physical quantities in the application field of optical fiber sensing technology. In the field of safety monitoring such as large bridges, tunnels, and dams, the two parameters of temperature and stress must be detected. However, since the optical fiber itself is sensitive to temperature and stress at the same time, that is, temperature and stress will simultaneously cause changes in the optical fiber sensing signal, making it impossible to distinguish the specific effects of the two, which is the problem of cross sensitivity. The problem of cross-sensitivity can be said to be a common problem in optical fiber sensing technology, which restricts the application and promotion of opt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01L1/24
Inventor 庞拂飞章健齐博周亭曹雯馨王廷云陈振宜
Owner SHANGHAI UNIV
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