Coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor

A fiber optic sensor, coaxial fiber technology, used in thermometers with physical/chemical changes, thermometers, and measurement of force by measuring changes in optical properties of materials when they are stressed, to achieve good compatibility, strong stability, and good The effect of compatibility

Inactive Publication Date: 2012-11-07
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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  • Coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor
  • Coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor

Examples

Experimental program
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Effect test

Embodiment 1

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

Embodiment 2

[0023] See figure 1 This embodiment is basically the same as the first embodiment, 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 fiber 1, first coaxial fiber 2, intermediate single-mode fiber 3, second coaxial fiber 4, and single-mode output fiber 5, of which the first coaxial fiber 2 And the second coaxial fiber 4 have a double-clad structure. In the first coaxial fiber 2, the refractive index of the core 6 and the outer cladding 7 is higher than that of the inner cladding 8. In the second coaxial fiber 4, the core The refractive index of 9 and the outer cladding 10 is higher than that of the inner cladding 11. Although both coaxial fibers have a double-clad structure, their inner cladding dopant materials, inner cladding thickness and refractive index of the inner cladding Values ​​are different, so they have different cladding mode resonant filter spectral wavel...

Embodiment 3

[0026] See figure 2 The structure of this embodiment consists of five parts: single-mode input fiber 1, first coaxial fiber 2, intermediate single-mode fiber 3, second coaxial fiber 4, and single-mode output fiber 5, of which the first coaxial fiber 2 And the second coaxial optical fiber 4 has 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 that of the first cladding 8 and the third cladding 23, and 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 fibers have a three-clad structure, they The first cladding and the second cladding doped materials, the thickness of the inner cladding and the refractive index of the inner cladding are different, so they have different cladding mode resonance filter spectral wavelengths (respec...

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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 of optical fiber sensing technology. In the safety monitoring field of large bridges, tunnels, dams, etc., it is necessary to detect the two parameters of temperature and stress. However, because the optical fiber itself is sensitive to temperature and stress at the same time, that is, temperature and stress will cause changes in the optical fiber sensing signal at the same time, making it impossible to distinguish the specific effects of the two. This is the cross-sensitivity problem. The cross-sensitivity problem can be said to be a common problem of optical fiber sensing technology, which restricts the application and promotion of optical fiber ...

Claims

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Application Information

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Patent Type & Authority Patents(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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