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A wedge-shaped microhole fiber grating capable of simultaneously measuring seawater temperature, salinity and pressure

A technology of micro-hole optical fiber and salinity, which is applied in the direction of cladding optical fiber, grating fiber, measuring device, etc., can solve the problems of packaging and practical application difficulties, and achieve the effect of solving cross-sensitivity problems and eliminating the influence of salinity and temperature

Active Publication Date: 2019-12-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure adopts a long-distance cascading design, which fails to achieve structural integration and high integration in terms of fiber size, and faces great difficulties in packaging and practical applications.

Method used

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  • A wedge-shaped microhole fiber grating capable of simultaneously measuring seawater temperature, salinity and pressure
  • A wedge-shaped microhole fiber grating capable of simultaneously measuring seawater temperature, salinity and pressure
  • A wedge-shaped microhole fiber grating capable of simultaneously measuring seawater temperature, salinity and pressure

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Embodiment 1

[0026] The invention proposes a wedge-shaped microhole fiber grating integrated structure capable of producing a high birefringence effect. like figure 1 Shown is a cross-sectional view of a wedge-shaped microhole fiber grating. Firstly, the microhole optical fiber was prepared by the stack-drawing technique (n 0 =1.45), and its outer diameter r=62.5 μm. A wedge-shaped defect is introduced by micro-processing technology to form an asymmetric birefringent structure, and the wedge angle θ1=50°. In this structure, a metal film is introduced at the microporous surface and at the defects: D1 = 30 nm. Microwells filled with PDMS(n PDMS =1.42) has a high negative thermo-optic coefficient, which improves the temperature-sensitive and mechanical properties of the structure. The relevant dimensions for micropores and wedge-shaped defects are: D2 = 5 μm, R1 = 6 μm, D3 = 45 μm, R2 = 10 μm.

[0027] exist figure 2 A radial view of a microhole fiber grating is given in . A refracti...

Embodiment 2

[0041] The invention proposes a wedge-shaped microhole fiber grating integrated structure capable of producing a high birefringence effect. like figure 1 Shown is a cross-sectional view of a wedge-shaped microhole fiber grating. Firstly, the microhole optical fiber was prepared by the stack-drawing technique (n 0 =1.45), and its outer diameter r=62.5 μm. A wedge-shaped defect is introduced by micro-processing technology to form an asymmetric birefringent structure, and the wedge angle θ1=55°. In this structure, a metal film is introduced at the microporous surface and at the defects: D1 = 20 nm. Microwells filled with PDMS(n PDMS =1.42) has a high negative thermo-optic coefficient, which improves the temperature-sensitive and mechanical properties of the structure. The relevant dimensions for micropores and wedge-shaped defects are: D2 = 3 μm, R1 = 6 μm, D3 = 35 μm, R2 = 10 μm.

[0042] exist figure 2 A radial view of a microhole fiber grating is given in . A refracti...

Embodiment 3

[0050] The invention proposes a wedge-shaped microhole fiber grating integrated structure capable of producing a high birefringence effect. like figure 1 Shown is a cross-sectional view of a wedge-shaped microhole fiber grating. Firstly, the microhole optical fiber was prepared by the stack-drawing technique (n 0 =1.45), and its outer diameter r=62.5 μm. A wedge-shaped defect is introduced by micro-processing technology to form an asymmetric birefringent structure, and the wedge angle θ1=45°. In this structure, a metal film is introduced at the microporous surface and at the defects: D1 = 40 nm. Microwells filled with PDMS(n PDMS = 1.42). The relevant dimensions for micropores and wedge-shaped defects are: D2 = 7 μm, R1 = 6 μm, D3 = 55 μm, R2 = 10 μm.

[0051] exist figure 2 A radial view of a microhole fiber grating is given in . A refractive index modulated fiber grating structure is introduced at the waveguide core by ultraviolet exposure or femtosecond laser proce...

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Abstract

The invention provides a wedge-shaped microhole optical fiber grating that can simultaneously measure seawater temperature, salinity and pressure. The microhole optical fiber has multiple microhole structures symmetrically distributed around the fiber core; one of the microhole structures on the outer wall is accurately destroyed. A wedge-shaped structure is formed; the opening angle of the wedge-shaped structure is equal to the internal angle of the micropore θ1 = 45°~55°; the wedge-shaped structure and the surface of the micropore are coated with Au film, which is completed by the chemical plating method to form the SPR sensing required for sensing. area, the film thickness remains consistent everywhere, and the suitable Au film thickness D1=20~40nm; the microporous structure is filled with sensitive material (PDMS) with high thermo-optical coefficient after coating; the wedge-shaped structure is along the axial direction of the fiber core Closest to the core of the fiber, a grating region that can produce periodic refractive index modulation at the core is formed by using fiber writing technology. This structure can better solve the problem of cross-sensitivity of three parameters and achieve high-sensitivity measurement. Its highly integrated and integrated design has strong stability and great potential for sensing applications.

Description

technical field [0001] The invention belongs to the technical field of design of micro-optoelectronic devices, and relates to a wedge-shaped microhole optical fiber grating integrated structure capable of simultaneously measuring seawater temperature, salinity and pressure. Environmental survey, military defense and other fields of service. Background technique [0002] In recent years, due to the continuous improvement of technical requirements for the development of key marine resources and long-term environmental surveys, higher requirements have been put forward for the development and use of real-time high-sensitivity sensors. Optical fiber sensing technology has unique advantages in ocean detection: the all-fiber sensing system can transmit optical signals over long distances along any path, has large information capacity, high data transmission accuracy, and avoids the problem of underwater leakage of sensors. In addition, it has low application cost, long life, main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G01D5/353
CPCG01D5/35316G01D5/35367G02B6/0208G02B6/02123
Inventor 赵勇吴奇鲁
Owner NORTHEASTERN UNIV LIAONING
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