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 type micropore fiber grating capable of measuring the a mtemperature, salinity and pressure of seawater simultaneously. A micropore fiber internally includes micropore structures distributed around a fiber core symmetrically; one micreopore structure whose outer wall is damaged accurately forms a wedge type structure; an open angle of the wedge type structure equalsthe internal angle theta1=45-55 degree of the micropore; the surfaces of the wedge type structure and the micropore is plated with an Au film by chemical plating, an SPR sensing area required by sensing is formed, the film thickness is kept consistent everywhere, and the proper film D1=20-40nm of the Au film; the micropore structure is filled with a sensitive material PDMS of high thermal-opticalcoefficient after film plating; and the wedge type structure forms a grating region, which can generate periodic refractive index modulation in the fiber core, at the position clearest to the fiber core along the axial direction of the fiber core via a fiber etching technology. The structure solves the problem that three parameters are sensitive to one another, and high-sensitivity measurement isrealized. The highly-integrated design is highly stable, and has high potentials in sensing application.

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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