CN117492131A - High-temperature-resistant optical fiber with high alumina content and fiber grating - Google Patents
High-temperature-resistant optical fiber with high alumina content and fiber grating Download PDFInfo
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- CN117492131A CN117492131A CN202311447913.3A CN202311447913A CN117492131A CN 117492131 A CN117492131 A CN 117492131A CN 202311447913 A CN202311447913 A CN 202311447913A CN 117492131 A CN117492131 A CN 117492131A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 107
- 239000000835 fiber Substances 0.000 title claims abstract description 63
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims description 47
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052747 lanthanoid Inorganic materials 0.000 claims description 2
- 150000002602 lanthanoids Chemical class 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052706 scandium Inorganic materials 0.000 claims description 2
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 abstract description 16
- -1 aluminum ion Chemical class 0.000 abstract description 16
- 239000010453 quartz Substances 0.000 abstract description 10
- 239000005354 aluminosilicate glass Substances 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005229 chemical vapour deposition Methods 0.000 abstract description 4
- 238000004031 devitrification Methods 0.000 abstract description 4
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000007496 glass forming Methods 0.000 abstract description 2
- 239000004071 soot Substances 0.000 abstract description 2
- 239000003365 glass fiber Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 16
- 239000000203 mixture Substances 0.000 description 12
- 238000000137 annealing Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 235000012239 silicon dioxide Nutrition 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010954 commercial manufacturing process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/045—Silica-containing oxide glass compositions
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02114—Refractive index modulation gratings, e.g. Bragg gratings characterised by enhanced photosensitivity characteristics of the fibre, e.g. hydrogen loading, heat treatment
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02147—Point by point fabrication, i.e. grating elements induced one step at a time along the fibre, e.g. by scanning a laser beam, arc discharge scanning
Abstract
Compared with the conventional aluminum ion doped optical fiber, the high-temperature resistant optical fiber and the fiber grating provided by the invention have the advantages that the problem of uneven distribution of aluminum ions in the doping process can be solved from the source, and the problem of devitrification and devitrification of the high-content aluminum ions in the glass forming process can be effectively solved from the preparation of the aluminosilicate glass; in addition, the addition of zirconia can improve the temperature resistance of the optical fiber and the fiber bragg grating, and the aluminum ion doped quartz optical fiber is mainly prepared by doping an aluminum ion solution and combining a quartz soot body prepared by chemical vapor deposition, so that the crystallization problem caused by high-concentration doped aluminum ions cannot be effectively solved by the method.
Description
Technical Field
The invention belongs to the technical field of optical fibers and fiber gratings, and particularly relates to a high-temperature resistant optical fiber with high alumina content and a fiber grating.
Background
Currently, for the traditional quartz fiber laser, the further improvement of the power is mainly limited by thermal management, damage threshold, stimulated brillouin scattering and the like. These limitations are dependent only on the physical performance parameters of the fiber material, regardless of the fiber length and the design of the laser. In addition, under extreme conditions such as high temperature, high pressure, strong radiation, strong electromagnetic interference, strong corrosiveness, few sensors can provide accurate and reliable temperature, pressure, healthy running and other information, which also becomes a difficult problem in the scientific and industrial fields. The development of the optical fiber sensor for monitoring the high-temperature high-pressure severe environment mostly adopts a standard quartz single-mode optical fiber, but is limited by the existing low-concentration doped optical fiber, and when the optical fiber works at a higher temperature, the stability of an optical fiber device and the mechanical strength of a sensing optical fiber are both deteriorated, so that the application of the optical fiber sensor is severely restricted.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-temperature resistant optical fiber with high alumina content, a fiber grating and a preparation method thereof.
The technical scheme adopted by the invention is as follows: the high-temperature resistant optical fiber with high alumina content and the fiber grating comprise the following components in percentage by weight: xAl 2 O 3 -yZrO 2 -zR 2 O 3 -(100-x-y-z)SiO 2 ；
Wherein, the value range of x is 0-40mol%;
y has a value ranging from 0 to 25mol%;
the value of z ranges from 0 to 10mol%;
x, y, z are not zero at the same time.
The R is one or more of yttrium, scandium, lanthanoid, iron, titanium, chromium and nickel;
and writing the high-alumina-content high-temperature-resistant optical fiber into a Bragg grating structure by using femtosecond laser, thus obtaining the high-temperature-resistant optical fiber grating.
And (3) carrying out periodic local heat treatment by adopting a heat treatment method of high-voltage electrode arc discharge to form periodic modulation of refractive index, thus obtaining the high-temperature-resistant fiber grating.
The sections of the high-temperature resistant optical fiber and the fiber bragg grating are round or n-sided, wherein n is more than or equal to 4 and less than or equal to 16.
The fiber core diameter of the glass fiber with high alumina content is 5-400um, and the outer diameter is 125-20000 um.
The beneficial effects of the invention are as follows:
(1) Compared with the conventional aluminum ion doped optical fiber, the high-temperature resistant optical fiber and the fiber grating can solve the problem of uneven distribution of aluminum ions in the doping process from the source starting from the preparation of aluminum silicate glass, and meanwhile, the addition of boron oxide and alkali metal can reduce the temperature and viscosity of glass melting, so that the problem of devitrification and devitrification of high-content aluminum ions in the glass forming process is effectively solved; in addition, the addition of zirconia can improve the temperature resistance of the optical fiber and the fiber bragg grating, and the aluminum ion doped quartz optical fiber is mainly prepared by doping an aluminum ion solution and combining a silicon dioxide soot body prepared by chemical vapor deposition, so that the crystallization problem caused by high-concentration doped aluminum ions cannot be effectively solved by the method;
(2) The high alumina content glass optical fiber and the fiber grating have good thermal stability, and the working temperature is 1200-1650 ℃ and can bear 1700 ℃ at most; the optical transparency is good in the wavelength range from ultraviolet to infrared, the minimum loss is 5.7dB/km@1064nm, the absorption loss is 1.2dB/m@2936nm, and the damage threshold is higher than 1.5kJ/cm 2 The diameter of 110 mu m has great application potential in infrared sensing and energy transmission, is particularly suitable for application in extremely high temperature environment, and provides an effective solution for preparing an ultra-high temperature resistant optical fiber sensor;
(3) The core-cladding structure of the high alumina content glass optical fiber and the fiber grating can reduce the influence of particles and pollutants in the external environment, and greatly reduce the risks of introducing scattering loss and absorption loss;
(4) The high alumina content glass optical fiber and the fiber grating have the characteristics of low loss, high temperature resistance, expandability, easiness in manufacturing and the like, and are easy to successfully transition to a commercial manufacturing process.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a glass fiber sleeve diagram, a schematic cross-sectional view and a schematic cross-sectional view of a fiber grating according to examples 1 and 2 and comparative examples 1, 2 and 3 of the present invention;
FIG. 2 is a schematic cross-sectional view of regular hexagons and regular octagons of the high alumina content glass optical fibers and fiber gratings according to examples 3 and 4 of the present invention;
FIG. 3 is a schematic illustration of an optical fiber ultra-high temperature sensing temperature measurement platform;
FIG. 4 is a graph of the high temperature cycle test of the cross section of a high alumina content glass fiber grating according to example 2;
FIG. 5 is a graph of the high temperature cycle test of the cross section of a high alumina content glass fiber grating according to example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Example 1
The embodiment provides a glass optical fiber and an optical fiber grating with high alumina content, wherein the optical fiber comprises the following components in percentage by weight: 25Al 2 O 3 -5ZrO 2 -70SiO 2 。
The high alumina content high temperature resistant optical fiber and optical fiber grating in this embodiment specifically comprises the following steps:
(1) Uniformly mixing the components according to the proportion, placing the mixture into a graphite crucible, melting the mixture for 10 hours in a high-temperature furnace at 2200 ℃, and rapidly cooling the mixture to form aluminosilicate glass;
(2) Processing the aluminosilicate glass into a glass rod after annealing treatment to obtain an optical fiber core rod;
(3) Melting the optical fiber core rod and the quartz glass sleeve at a high temperature of 2000 ℃ to prepare a high-alumina-content high-temperature-resistant optical fiber preform;
(4) Drawing the optical fiber preform on a drawing tower to obtain an optical fiber with a fiber core diameter of 15.0um and an outer diameter of 125 μm;
(5) And carrying out periodic local heat treatment on the high alumina content glass fiber by adopting a heat treatment method of high-voltage electrode arc discharge to form periodic modulation of refractive index, thereby obtaining the high-temperature-resistant fiber grating.
A high alumina content glass fiber sleeve diagram, a cross-sectional schematic diagram and a fiber grating cross-sectional schematic diagram are shown in FIG. 1.
Performance test:
the high-temperature sensing characteristic test analysis is carried out on the glass fiber with high alumina content and the high-temperature resistant fiber grating by adopting the all-fiber ultra-high temperature sensing temperature measuring platform shown in fig. 3. The input light source is a broadband light source, and the spectrometer is an OFS. And controlling the temperature by using a vacuum tube furnace, setting the temperature-raising program to be 5 ℃/min, maintaining the temperature at 100 ℃ for 10min, recording data once, maintaining the temperature for 1h after the temperature is raised to 1600 ℃, cooling at the same speed, and recording corresponding data. In order to eliminate the influence of the residual stress of the optical fiber, the temperature of the optical fiber and the fiber grating can reach 1600 ℃ after a plurality of annealing experiments.
Example 2
The embodiment provides a glass optical fiber and an optical fiber grating with high alumina content, wherein the optical fiber comprises the following components in percentage by weight: 35Al 2 O 3 -5Yb 2 O 3 -60SiO 2 。
The high alumina content high temperature resistant optical fiber and optical fiber grating in this embodiment specifically comprises the following steps:
(1) Uniformly mixing the components according to the proportion, placing the mixture into a graphite crucible, melting the mixture for 10 hours in a high-temperature furnace at 2200 ℃, and rapidly cooling the mixture to form aluminosilicate glass;
(2) Processing the aluminosilicate glass into a glass rod after annealing treatment to obtain an optical fiber core rod;
(3) Melting the optical fiber core rod and the quartz glass sleeve at a high temperature of 2000 ℃ to prepare a high-alumina-content high-temperature-resistant optical fiber preform;
(4) Drawing the optical fiber preform into an optical fiber with a core diameter of 18.0um and an outer diameter of 125 μm on a drawing tower;
(5) And writing the high alumina content glass fiber into a Bragg grating (FBG) structure by using femtosecond laser with the wavelength of 400nm to obtain the high temperature resistant fiber grating.
A high alumina content glass fiber sleeve diagram, a cross-sectional schematic diagram and a fiber grating cross-sectional schematic diagram are shown in FIG. 1.
Performance test:
the high-temperature sensing characteristic test analysis is carried out on the glass optical fiber with high alumina content and the high-temperature resistant optical fiber grating by adopting the all-optical fiber ultra-high temperature sensing temperature measuring platform shown in fig. 3. The input light source is a broadband light source, and the spectrometer is an OFS. And controlling the temperature by using a vacuum tube furnace, setting the temperature-raising program to be 5 ℃/min, maintaining the temperature at 100 ℃ for 10min, recording data once, maintaining the temperature for 1h after the temperature is raised to 1600 ℃, cooling at the same speed, and recording corresponding data. In order to eliminate the influence of the residual stress of the optical fiber, the temperature of the optical fiber and the fiber grating can reach 1600 ℃ after a plurality of annealing experiments. FIG. 4 shows a graph of the high temperature cyclic damage test of the section of the high alumina content glass fiber grating.
Example 3
The embodiment provides a glass optical fiber and an optical fiber grating with high alumina content, wherein the optical fiber comprises the following components in percentage by weight: 35Al 2 O 3 -15ZrO 2 -5-Tm 2 O 3 -45SiO 2 。
The high alumina content high temperature resistant optical fiber and optical fiber grating in this embodiment specifically comprises the following steps:
(1) Uniformly mixing the components according to the proportion, placing the mixture into a graphite crucible, melting the mixture for 10 hours in a high-temperature furnace at 2200 ℃, and rapidly cooling the mixture to form aluminosilicate glass;
(2) Processing the aluminosilicate glass into a glass rod after annealing treatment to obtain an optical fiber core rod;
(3) Melting the optical fiber core rod and the quartz glass sleeve at a high temperature of 2000 ℃ to prepare a high-alumina-content high-temperature-resistant optical fiber preform;
(4) Drawing the optical fiber preform on a drawing tower to obtain an optical fiber with a fiber core diameter of 15.0um and an outer diameter of 125 μm;
(5) And carrying out periodic local heat treatment on the high alumina content glass fiber by adopting a heat treatment method of high-voltage electrode arc discharge to form periodic modulation of refractive index, thereby obtaining the high-temperature-resistant fiber grating.
A schematic cross-sectional view of a high alumina content glass fiber and fiber grating regular hexagon and regular octagon is shown in FIG. 2.
Performance test:
the high-temperature sensing characteristic test analysis is carried out on the glass fiber with high alumina content and the high-temperature resistant fiber grating by adopting the all-fiber ultra-high temperature sensing temperature measuring platform shown in fig. 3. The input light source is a broadband light source, and the spectrometer is an OFS. And controlling the temperature by using a vacuum tube furnace, setting the temperature-raising program to be 5 ℃/min, maintaining the temperature at 100 ℃ for 10min, recording data once, raising the temperature to 1200 ℃ and then maintaining the temperature for 1h, cooling at the same speed, and recording corresponding data. In order to eliminate the influence of the residual stress of the optical fiber, the temperature of the optical fiber and the fiber grating can reach 1500 ℃ after a plurality of annealing experiments. FIG. 5 shows a high temperature cycle test chart of the cross section of a high alumina content glass fiber grating.
Example 4
The embodiment provides a glass optical fiber and an optical fiber grating with high alumina content, wherein the optical fiber comprises the following components in percentage by weight: 30Al 2 O 3 -10ZrO 2 -60SiO 2 。
The high alumina content high temperature resistant optical fiber and optical fiber grating in this embodiment specifically comprises the following steps:
(1) Uniformly mixing the components according to the proportion, placing the mixture into a graphite crucible, melting the mixture for 10 hours in a high-temperature furnace at 2200 ℃, and rapidly cooling the mixture to form aluminosilicate glass;
(2) Processing the aluminosilicate glass into a glass rod after annealing treatment to obtain an optical fiber core rod;
(3) Melting the optical fiber core rod and the quartz glass sleeve at a high temperature of 2000 ℃ to prepare a high-alumina-content high-temperature-resistant optical fiber preform;
(4) Drawing the optical fiber preform on a drawing tower to obtain an optical fiber with a fiber core diameter of 15.0um and an outer diameter of 125 μm;
(5) And writing the high alumina content glass fiber into a Bragg grating structure by using femtosecond laser with the wavelength of 400nm to obtain the high temperature resistant fiber grating. A schematic cross-sectional view of a high alumina content glass fiber and fiber grating regular hexagon and regular octagon is shown in FIG. 2.
Performance test:
the high-temperature sensing characteristic test analysis is carried out on the glass fiber with high alumina content and the high-temperature resistant fiber grating by adopting the all-fiber ultra-high temperature sensing temperature measuring platform shown in fig. 3. The input light source is a broadband light source, and the spectrometer is an OFS. And controlling the temperature by using a vacuum tube furnace, setting the temperature-raising program to be 5 ℃/min, maintaining the temperature at 100 ℃ for 10min, recording data once, maintaining the temperature for 1h after the temperature is raised to 1600 ℃, cooling at the same speed, and recording corresponding data. In order to eliminate the influence of the residual stress of the optical fiber, the temperature of the optical fiber and the fiber grating can reach 1600 ℃ after a plurality of annealing experiments.
Comparative example 1
The quartz optical fiber doped with aluminum ions is prepared by combining a chemical vapor deposition method with a solution soaking method, and the process details are as follows: depositing a quartz loose body in a 1650 ℃ quartz glass sleeve by a chemical vapor deposition technology, wherein the thickness of the loose body is 40um, the diameter D50 of a hole is 550nm, soaking the quartz loose body in aluminum ions with the doping concentration of 20mol percent, and adsorbing the aluminum ions on the surface or in pores of the loose body for a certain time, wherein the quartz loose body comprises the following components:20Al 2 O 3 -80SiO 2 sintering and shrinking the preform into a columnar optical fiber preform rod at high temperature on a lathe; in the process of sintering and shrinking the optical fiber preform into a rod at high temperature on a lathe, alumina crystals are precipitated in the optical fiber preform due to non-uniformity of a temperature system and non-uniformity of high-concentration doping of aluminum ions, which is shown as white vaporific crystals in the preform, and the preform is devitrified. A high alumina content glass fiber sleeve diagram, a cross-sectional schematic diagram and a fiber grating cross-sectional schematic diagram are shown in FIG. 1.
Comparative example 2
In the comparative example, quartz glass with the purity of 99.999% is used for preparing optical fibers and fiber gratings thereof, and the wire drawing and the preparation process of the fiber gratings are the same as that of example 1; a high alumina content glass fiber sleeve diagram, a cross-sectional schematic diagram and a fiber grating cross-sectional schematic diagram are shown in FIG. 1.
Performance test:
the quartz optical fiber and the fiber grating are subjected to high-temperature sensing characteristic test analysis by adopting the all-optical fiber ultra-high-temperature sensing temperature measuring platform shown in fig. 3. The input light source is a broadband light source, and the spectrometer is an OFS. And controlling the temperature by using a vacuum tube furnace, setting the temperature-raising program to be 5 ℃/min, maintaining the temperature at 100 ℃ for 10min, recording data once, raising the temperature to 800 ℃ and then maintaining the temperature for 1h, cooling at the same speed, and recording corresponding data. In order to eliminate the influence of the residual stress of the optical fiber, the temperature of the optical fiber and the fiber grating can reach 800 ℃ after a plurality of annealing experiments.
Comparative example 3
The comparative example adopts the proportion of 20Na 2 O-20B 2 O 3 -5ZrO 2 -60SiO 2 Preparing an optical fiber and an optical fiber grating thereof, wherein the wire drawing and the preparation process of the optical fiber grating are the same as in example 1; a high alumina content glass fiber sleeve diagram, a cross-sectional schematic diagram and a fiber grating cross-sectional schematic diagram are shown in FIG. 1.
Performance test:
and adopting the all-fiber ultra-high temperature sensing temperature measuring platform shown in fig. 3 to test and analyze the high temperature sensing characteristics of the fiber and the fiber grating. The input light source is a broadband light source, and the spectrometer is an OFS. And controlling the temperature by using a vacuum tube furnace, setting the temperature-raising program to be 5 ℃/min, maintaining the temperature at 100 ℃ for 10min, recording data once, maintaining the temperature for 1h after the temperature is raised to 600 ℃, cooling at the same speed, and recording corresponding data. In order to eliminate the influence of the residual stress of the optical fiber, the temperature of the optical fiber and the fiber grating can reach 600 ℃ after a plurality of annealing experiments.
In summary, the high alumina content glass optical fiber and the high temperature resistant fiber grating provided by embodiments 1-4 of the present invention have good thermal stability and excellent high temperature resistance; the optical fibers and the optical fiber gratings obtained in comparative examples 1, 2 and 3 have poor thermal stability and poor high temperature resistance.
The present invention is not limited to the above-described preferred embodiments, and any person who can obtain other various products under the teaching of the present invention, however, any change in shape or structure of the product is within the scope of the present invention, and all the products having the same or similar technical solutions as the present application are included.
Claims (6)
1. The high-temperature resistant optical fiber with high alumina content and the fiber grating are characterized in that the optical fiber comprises the following components in proportion: xAl 2 O 3 -yZrO 2 -zR 2 O 3 -(100-x-y-z)SiO 2 ；
Wherein, the value range of x is 0-40mol%;
y has a value ranging from 0 to 25mol%;
the value of z ranges from 0 to 10mol%;
x, y, z are not zero at the same time.
2. The high alumina content high temperature resistant optical fiber and fiber grating according to claim 1, wherein R is one or more of yttrium, scandium, lanthanoid, iron, titanium, chromium, nickel.
3. The high alumina content high temperature resistant optical fiber and fiber grating according to claim 1, wherein the high alumina content high temperature resistant optical fiber is written into the Bragg grating structure by femtosecond laser, and the high temperature resistant fiber grating is obtained.
4. The high alumina content high temperature resistant optical fiber and fiber grating according to claim 1, wherein the high temperature resistant optical fiber grating is obtained by periodically performing local heat treatment by a high voltage electrode arc discharge heat treatment method to form periodic modulation of refractive index.
5. The high alumina content high temperature resistant fiber and fiber grating according to claim 1, wherein the cross section of the high temperature resistant fiber and fiber grating is circular or n-sided, wherein n is 4-16.
6. The high alumina content high temperature resistant optical fiber and fiber grating according to claim 1, wherein the high alumina content glass optical fiber has a core diameter of 5-400um and an outer diameter of 125-20000 μm.
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