CN114660706B - High-temperature-resistant fiber drawing tower grating sensing optical fiber and preparation method thereof - Google Patents
High-temperature-resistant fiber drawing tower grating sensing optical fiber and preparation method thereof Download PDFInfo
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- CN114660706B CN114660706B CN202210367860.3A CN202210367860A CN114660706B CN 114660706 B CN114660706 B CN 114660706B CN 202210367860 A CN202210367860 A CN 202210367860A CN 114660706 B CN114660706 B CN 114660706B
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- 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
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
- G02B6/021—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape
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- 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
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
- G02B6/021—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape
- G02B6/02104—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape characterised by the coating external to the cladding, e.g. coating influences grating properties
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- G—PHYSICS
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- 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
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- 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
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Abstract
The invention relates to a high-temperature-resistant fiber drawing tower grating sensing optical fiber and a preparation method thereof, comprising the following steps: (1) Sequentially carrying out hydrogen carrying treatment, fixed-point hydrogen fixing treatment and dehydrogenation treatment on the seed grating optical fiber coated with the organic matter coating to obtain a hydrogenated optical fiber; (2) In a protective atmosphere, carrying out regenerative carbonization treatment on the hydrogenated optical fiber at 850-950 ℃ to obtain a regenerative carbonized optical fiber; (3) And (3) coating and curing the metal coating on the regenerated carbonized optical fiber to obtain the high-temperature-resistant fiber drawing tower grating sensing optical fiber. The high-temperature resistant fiber drawing tower grating sensing optical fiber can work at a high temperature of 900-1000 ℃, and after high-temperature regeneration, the optical fiber is coated with a metal coating again, so that the mechanical strength of the optical fiber is enhanced, and the tensile strength can reach 20-40N.
Description
Technical Field
The invention belongs to the field of high-temperature-resistant fiber gratings, and particularly relates to a high-temperature-resistant fiber drawing tower grating sensing fiber and a preparation method thereof.
Background
The unique advantages of fiber gratings in thermodynamics and optics make them an important component of optical communication systems and optical sensing systems. The high-temperature sensing application field is wide and mostly applied to the industrial engineering field. Such as temperature sensing in oil and gas well fields, blast furnaces in smelting plants, temperature monitoring of space engines, and the like. The failure rate of the traditional electronic sensor can be increased along with the temperature rise, errors can be increased after long-term use, and even life safety risks can be brought in certain special fields. When the measured wavelength of the fiber grating is changed in the sensing process, the reflection wavelength of the fiber grating is also changed. The intrinsically safe optical signal can be subjected to remote sensing transmission, so that the optical signal is very suitable for sensing physical parameters under the conditions of oil and gas exploitation well fields, conveying pipelines and the like, however, the optical signal is in a high-temperature environment in the application fields of petrochemical industry and the like, and the optical fiber grating has higher requirements on temperature resistance.
The fiber grating of the traditional wire drawing tower has poor temperature resistance and can only work stably at a lower temperature. Detecting the temperature and fault points of a heating system, a steam pipeline and an oil pipeline of a thermal power plant; in the fields of equipment temperature monitoring of geothermal power stations and indoor closed substations, the grating is expected to operate at high temperatures above 300 ℃. After long-term heat treatment at 300 ℃, the reflectivity of the fiber bragg grating of the conventional wire drawing tower can be greatly reduced, meanwhile, the organic coating can be carbonized at a high temperature for a long time, the mechanical strength is only about 30% of the original strength, and long-distance signal transmission and service life of the fiber bragg grating are affected.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides a high-temperature-resistant fiber bragg grating sensing fiber and a preparation method thereof, aiming at the problems of poor temperature resistance and reduced mechanical strength caused by damaged coatings of conventional fiber bragg gratings, and realizing that the fiber bragg gratings can be used in a high-temperature (900-1000 ℃) environment.
In order to achieve the technical purpose, the technical scheme of the method is as follows:
the method comprises the following steps:
(1) Sequentially carrying out hydrogen carrying treatment, fixed-point hydrogen fixing treatment and dehydrogenation treatment on the seed grating optical fiber coated with the organic matter coating to obtain a hydrogenated optical fiber;
(2) In a protective atmosphere, carrying out regenerative carbonization treatment on the hydrogenated optical fiber at 850-950 ℃ to obtain a regenerative carbonized optical fiber;
(3) And (3) coating and curing the metal coating on the regenerated carbonized optical fiber to obtain the high-temperature-resistant fiber drawing tower grating sensing optical fiber.
Further, the seed grating optical fiber is G657 bending-resistant optical fiber or more than 30wt% of high germanium-doped optical fiber; in the step (1), the organic coating is a polyimide coating; the grating in the seed grating optical fiber is formed by carrying out single pulse exposure on the optical fiber by configuring 193nm excimer laser through a phase mask method; in the step (1), the hydrogen carrying treatment pressure is 10MPa, and the hydrogen carrying time is 6-8 days.
Further, in the step (1), the fixed-point hydrogen fixation treatment is to heat the grating in the seed grating optical fiber at the fixed point, the heating temperature is 300-350 ℃ and the time is 1-5 min.
Further, in the step (1), the dehydrogenation treatment is carried out at 100 ℃ for 3-7 days.
Further, the regenerating carbonization treatment in the step (2) and the metal coating and curing in the step (3) are continuous treatments, and the advancing speed of the optical fiber is 1-2 m/min.
Further, in the step (2), the protective atmosphere is nitrogen; the regeneration carbonization treatment is carried out in a tube furnace, and the length of the tube furnace is 8-12 m.
Further, in the step (3), the slurry of the metal coating comprises 70-85% of metal, 5% of resin and 25-10% of organic solvent by mass percent; the coating thickness is 3-6 microns.
Further, the metal is silver or copper, the resin is polyacrylate, and the organic solvent is isopropanol.
Further, in the step (3), curing is performed under a protective atmosphere; the curing comprises two-stage curing, wherein the temperature of the first-stage curing is 150-180 ℃, and the temperature of the second-stage curing is 1000-1100 ℃.
The technical scheme of the sensing optical fiber is that the grating reflectivity in the high-temperature-resistant fiber drawing tower grating sensing optical fiber is as follows
Compared with the prior art, the invention has the beneficial effects that:
1. the invention regenerates the grating at 850-950 ℃, and the carbonization of the organic coating is performed simultaneously with the grating regeneration process, thereby saving the working procedures. 2. The high-temperature resistant fiber drawing tower grating can work at a high temperature of 900-1000 ℃.3. In the preparation process of the high-temperature-resistant fiber drawing tower grating, the fiber is coated with the metal coating again after high-temperature regeneration, so that the mechanical strength of the fiber is enhanced, and the tensile strength of the fiber can reach 20-40N. 4. The final reflectivity of the high-temperature-resistant fiber drawing tower grating can reach
Can meet the requirements of different working conditions.
Furthermore, the grating regeneration process, the coating of the regenerated metal coating and the heat curing of the metal coating are continuously carried out, so that the continuity of the preparation of the high-temperature-resistant fiber drawing tower grating is ensured, and the occurrence of fiber breakage caused by the reduction of the fiber strength after grating regeneration is avoided.
Drawings
FIG. 1 is a schematic diagram of a device for preparing a regenerated grating of a high-temperature wire drawing tower and coating and solidifying a subsequent metal coating.
FIG. 2 is a flow chart of the preparation of the high temperature resistant fiber grating string of the present invention.
FIG. 3 shows the regeneration process of the high germanium-doped grating at a constant temperature of 900 ℃.
FIG. 4 is a graph showing the reflection intensity of the seed grating and the regenerated grating at room temperature.
The device comprises a 1-optical fiber, a 2-tubular furnace, a 3-heating wire, a 4-first traction disc, a 5-coater, a 6-first curing furnace, a 7-second curing furnace, an 8-second traction disc, a 9-optical fiber disc and a 10-take-up disc.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of a continuous high-temperature-resistant wire-drawing tower grating, which aims at the problems that the mechanical strength is reduced and the wire-drawing tower grating is difficult to stably use for a long time in high-temperature environments due to the fact that a coating is damaged after hydrogen is loaded on the conventional wire-drawing tower grating. The method has the advantages of simple and reasonable process and high manufacturing efficiency, and the prepared fiber drawing tower grating can be used in a high-temperature (900-1000 ℃) environment. Can meet the requirements of industrial production and practical application.
The device mainly comprises a seed grating manufacturing device, a high-pressure hydrogen ballast, a hydrogen fixing device, a dehydrogenation device, a regeneration device and a coating and curing device; the seed grating manufacturing device comprises a wire drawing tower, a grating inscribing device, a coating device and a curing device, and specific reference is made to CN201510115832.2.
Referring to fig. 1, the regenerating device and the coating curing device of the present invention comprise an optical fiber tray 9, a tube furnace 2, a first traction tray 4, an applicator 5, a first curing furnace 6, a second curing furnace 7, a second traction tray 8 and a take-up reel 10 which are sequentially arranged; the heating wire 3 is arranged on the tube furnace 2, the front end part of the furnace chamber of the tube furnace 2 is provided with a nitrogen inlet, the rear end part of the furnace chamber is provided with a nitrogen outlet, and two ends of the tube furnace 2 are provided with opposite optical fiber inlets and outlets; the first curing furnace 6 and the second curing furnace 7 are arranged side by side, both ends of the first curing furnace and the second curing furnace are provided with nitrogen inlets and outlets, and a nitrogen outlet of the first curing furnace 6 is communicated with a nitrogen inlet on the second curing furnace 7; the optical fiber 1 to be treated is paid off through an optical fiber disc 9, passes through a tube furnace 2 under the protection of nitrogen, enters an applicator 5 through a first traction disc 4, sequentially passes through a first curing furnace 6 and a second curing furnace 7 under the protection of nitrogen, and reaches a take-up disc 10 through a second traction disc 8 to complete the regeneration and the coating curing of the optical fiber grating.
The applicator 5 may be installed above the first curing oven 6 or the second curing oven 7 as desired.
The length of the tube furnace 2 is 8-12 m, the heating wire 3 is wrapped outside the tube furnace 2, and nitrogen is continuously introduced in the heating process.
Referring to fig. 2, the method of the present invention comprises the steps of:
(1) Preparing a seed grating optical fiber coated with a polyimide coating by using a seed grating manufacturing device;
(2) Carrying out hydrogen carrying treatment on the seed grating optical fiber by using a high-pressure hydrogen carrying kettle;
(3) Carrying out short-time fixed-point hydrogen fixation treatment on the prepared seed grating optical fiber in a hydrogen fixation device at 300-350 ℃;
(4) The seed grating fiber after the hydrogen fixation treatment is subjected to dehydrogenation treatment after heat preservation for 3 to 7 days at the temperature of 100 ℃;
(5) After dehydrogenation treatment, carrying out high-temperature treatment at 850-950 ℃ on the seed grating optical fiber in a nitrogen protective atmosphere to regenerate a temperature-resistant grating, and simultaneously finishing carbonization treatment of the polyimide coating at high temperature under the protective atmosphere; and (3) immediately coating the carbonized optical fiber with a metal coating after the high-temperature regeneration is finished, and curing to generate the metal coating to obtain the high-temperature-resistant fiber-drawing tower grating sensing optical fiber.
In the step (1), the grating writing adopts a phase mask method to configure 193nm excimer laser to perform single pulse exposure on the optical fiber to write the grating. Polyimide coating is polyimide glue with the viscosity of 13000-15000 mpa.s and the molecular weight of 50000-60000 at normal temperature and the coating thickness of 4-10 micrometers; curing conditions: primary curing is carried out at 120-180 ℃, secondary curing and tertiary curing are carried out at 250-350 ℃.
In the step (2), the pressure during the hydrogen carrying treatment is 10MPa, and the hydrogen carrying time is about 1 week.
In the step (3), high-temperature hydrogen curing treatment at 300-350 ℃ is carried out in a fixed-point hydrogen fixing device, the treatment time is 1-5 min, and the hydrogen carried in the optical fiber can be rapidly cured at the temperature.
In the step (4), the seed grating array optical fiber after the hydrogen fixation treatment is subjected to dehydrogenation treatment at the temperature of 100 ℃, so that the hydrogen loss of the optical fiber can be reduced.
The optical fiber used in the invention is G657 bending-resistant optical fiber or high germanium-doped optical fiber (more than 30wt%).
The invention regenerates the grating at a high temperature of 850-950 ℃ and simultaneously carbonizes the polyimide coating. After the hydrogen-loaded optical fiber is subjected to hydrogen curing and coating carbonization, the optical fiber is coated with a metal coating again.
In the step (5), nitrogen is continuously introduced into the tube furnace when the tube furnace is used for grating regeneration of the fiber grating. Preferably, the tube furnace used in the invention has a length of about 10m, the speed of the optical fiber in the tube is 1-2 m/min, and the temperature is controlled between 850 and 950 ℃.
Further, the metal coating is coated with metal coating slurry, wherein the metal coating slurry comprises 70-85% of metal, 5% of resin and 25-10% of organic solvent by mass percent; coating thickness is 3-6 micrometers; the metal is silver (which can work for a long time at 950 ℃) or copper (which can work for a long time at 1000 ℃), the resin is polyacrylate, and the organic solvent is an alcohol organic solvent, preferably isopropanol; the curing is two-stage curing, the optical fiber is coated with a layer desolvation at 150-180 ℃, then metal is melted at 1000-1100 ℃, the optical fiber is cooled to form a film after being discharged from a furnace, and nitrogen is continuously introduced in the whole coating curing process. The optical fiber is coated by the metal coating material, so that the mechanical strength of the optical fiber is improved.
Further, the reflectivity of the seed grating prepared in the step (1) is 1% -10%.
Further, the final reflectivity of the high temperature resistant grating prepared in the step (5) is that
The high-temperature-resistant fiber drawing tower grating is subjected to hydrogen loading after the polyimide coating is coated, so that the photosensitivity and the temperature resistance of the optical fiber can be improved.
The invention is further illustrated by the following specific examples.
Example 1
The method for preparing the fiber bragg grating comprises the following steps:
step one: preparation of polyimide coated fiber bragg grating string
And clamping the optical fiber preform on an optical fiber drawing tower for fusion drawing, continuously extending the fused bare optical fiber downwards, inscribing the optical grating, coating the optical fiber preform with a polyimide coating, and finally collecting the optical fiber preform on a take-up reel. The grating writing adopts a phase mask method to configure 193nm excimer laser to carry out single pulse exposure on the bare fiber to write the grating; the exposure and the coating take-up are continuously carried out on line. The excimer laser light path (beam) keeps straight line transmission and is perpendicular to the bare optical fiber, and the pulse width of the 193nm excimer laser is less than or equal to 10ns. The optical fiber preform is placed in a drawing furnace, the lower end of the optical fiber preform is fused and then tapered into filaments, the diameter of the bare optical fiber is monitored through a bare optical fiber calliper, and the speed of the preform feeding device and the speed of the bare optical fiber are fed back and controlled in real time, so that the stable control of the diameter of the bare optical fiber is realized. The wire drawing processing speed is 30m/min. A grating is written on a bare optical fiber moving downwards by a grating writing device consisting of a phase mask plate and a 193nm laser, one optical pulse is written on one grating, and the bare optical fiber with the grating written is coated and solidified. After coating, the optical fiber is monitored by a coated optical fiber calliper to monitor the diameter of the coated optical fiber and the thickness of the coating layer is controlled. The coated optical fiber is marked by a grating marking device under the action of a traction wheel and then is collected on a collecting reel by the traction device (reference is made to the manufacturing process of the grating by the university of Wuhan chemical in patent: CN201510115832.2[ P ]. 2015-06-03.).
Step two: hydrogen carrying treatment
The high-pressure hydrogen-bearing treatment step comprises the following steps: placing the seed grating optical fiber with the polyimide coating in a high-pressure hydrogen loading kettle, covering a hydrogen loading kettle cover, injecting high-pressure hydrogen into the reaction kettle through a pneumatic hydrogen booster pump, reacting for 1 week under the high-pressure condition of 10MPa in the hydrogen loading kettle, completing hydrogen loading treatment, discharging the high-pressure hydrogen through a hydrogen exhaust pipe, and taking out an optical fiber disc in the hydrogen loading kettle.
Step three: fixed-point hydrogen curing of hydrogen-carrying fiber bragg grating
The optical fiber subjected to high-pressure hydrogen loading is subjected to local medium-high temperature treatment by a tubular furnace at 300-350 ℃, the grating is heated at fixed points by means of marks made at the inscribed grating in the process, hydrogen can be subjected to chemical reaction with the seed grating in the process to be solidified in the seed grating, so that diffusion overflow is avoided, the fixed-point solidification time is very short, polyimide is finished within a few minutes, polyimide is not carbonized at the moment, the mechanical strength of the treated optical fiber is well ensured, and the subsequent cabling process and cabling construction are facilitated.
Step four: fiber bragg grating dehydrogenation
After partial medium-high Wen Dingdian hydrogen curing treatment, the whole grating is placed into an oven to be dehydrogenated at 100 ℃ for about 1 week, so that redundant hydrogen is baked out, the hydrogen loss is reduced, and the sensing transmission of the sensing optical fiber for a longer distance is realized.
Step five: high temperature regeneration of gratings, carbonization of coatings and recoating
As shown in fig. 1, the optical fiber was fixed in the optical fiber tray of the staged curing oven, and nitrogen was continuously introduced into the curing oven and the tube furnace before grating regeneration was performed. When the optical fiber passes through a tubular furnace at 850-950 ℃, the grating can be regenerated due to the overhigh temperature, and the polyimide coating is carbonized in the nitrogen protection atmosphere. The mechanical strength of the fiber is greatly reduced by carbonization of the coating, but still withstands the pulling force of the first pulling disk.
The optical fiber is guided to a coater filled with metal coating slurry through a traction disc, after coating is finished, the optical fiber passes through a first curing furnace at 150-180 ℃ to remove solvent of a coating layer, then passes through a second curing furnace at 1000-1100 ℃ to ensure that the temperature is above the metal melting point, metal is melted, the metal liquid is coated on the surface of a carbon coating, the carbon coating is cooled to form a film after being discharged from the furnace, and finally the film is collected on a take-up disc through a traction device to obtain the high-temperature-resistant fiber drawing tower grating prepared by the invention.
FIG. 3 shows the regeneration process of the high germanium-doped grating at a constant temperature of 900 ℃. From the graph, the reflection intensity of the fiber drawing tower grating is reduced within 0-5 min and the reflection intensity is increased within 5-10 min at the constant temperature of 900 ℃, and the regeneration process of the fiber drawing tower grating only needs about 5-10 min.
The reflection intensity comparison graph of the seed grating and the regenerated grating at normal temperature can be seen in fig. 4, and the wavelength of the grating shifts rightwards by about 2.5nm after the grating is regenerated, and the reflection intensity difference is only about 8 dB.
The reflectivity of the high-temperature-resistant fiber drawing tower grating prepared by regeneration, recoating and curing is as follows
Can meet the requirements of different working conditions.
The tensile strength of the optical fiber is tested on a material testing machine, and as a result, the tensile strength of the carbonized coating optical fiber can reach 20-40N, and the optical fiber still has good tensile strength.
The invention relates to a preparation method of a high-temperature-resistant fiber drawing tower grating, which comprises the following steps: preparing a seed grating coated with a polyimide coating by using a wire drawing tower; carrying out hydrogen carrying treatment on the seed grating by using a high-pressure hydrogen carrying kettle; carrying out fixed-point hydrogen fixation treatment on the prepared seed grating in a hydrogen fixation device at 300-350 ℃; the seed grating array optical fiber after the hydrogen fixation treatment is subjected to dehydration at the temperature of 100 DEG CHydrogen treatment; after dehydrogenation treatment, carrying out high-temperature treatment at 850-950 ℃ on the seed grating to regenerate a temperature-resistant grating, and simultaneously carbonizing the polyimide coating in a nitrogen protective atmosphere; and after the high-temperature regeneration is finished, performing metal coating treatment on the fiber to obtain the high-temperature-resistant fiber drawing tower grating sensing fiber. Wherein the high-temperature grating regeneration process and the coating carbonization process are carried out simultaneously, and a tube furnace is used in the high-temperature regeneration process, so that the high-temperature regeneration of the seed grating and the carbonization of the coating are realized; the subsequent application of the metal coating layer uses a multi-stage curing apparatus. The reflectivity of the regenerated grating of the high-temperature resistant wire drawing tower is as follows
And the temperature of 900-1000 ℃ can be kept stable, the tensile strength of the whole sensing optical fiber is better, and the subsequent cabling and installation of the temperature measuring optical cable can be effectively ensured. The prepared optical fiber can detect the temperature and fault points of a heating system, a steam pipeline and an oil pipeline of a thermal power plant; and monitoring the equipment temperature of geothermal power stations and indoor closed substations.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (9)
1. The preparation method of the high-temperature-resistant fiber drawing tower grating sensing optical fiber is characterized by comprising the following steps of:
(1) Sequentially carrying out hydrogen carrying treatment, fixed-point hydrogen fixing treatment and dehydrogenation treatment on the seed grating optical fiber coated with the organic matter coating to obtain a hydrogenated optical fiber; the grating in the seed grating optical fiber is formed by performing single pulse exposure on the optical fiber by using excimer laser of 193nm configured by a phase mask method to write the grating;
(2) In a protective atmosphere, carrying out regenerative carbonization treatment on the hydrogenated optical fiber at 850-950 ℃ for 5-10 min to obtain a regenerative carbonized optical fiber;
(3) Coating and solidifying a metal coating on the regenerated carbonized optical fiber to obtain a high-temperature-resistant fiber drawing tower grating sensing optical fiber;
in the step (3), the slurry of the metal coating comprises 70-85% of metal, 5% of resin and 25-10% of organic solvent by mass percent; the coating thickness is 3-6 microns.
2. The method for preparing the high-temperature-resistant fiber bragg grating sensing optical fiber according to claim 1, wherein the seed grating optical fiber is a G657 bending-resistant optical fiber or a high germanium-doped optical fiber with more than 30wt%; in the step (1), the organic coating is a polyimide coating; in the step (1), the hydrogen carrying treatment pressure is 10MPa, and the hydrogen carrying time is 6-8 days.
3. The method for preparing the high-temperature-resistant fiber drawing tower grating sensing optical fiber according to claim 1, wherein in the step (1), the fixed-point hydrogen fixation treatment is to heat the grating in the seed grating optical fiber at a fixed point, the heating temperature is 300-350 ℃ and the time is 1-5 min.
4. The method for preparing a high temperature resistant fiber drawing tower grating sensing optical fiber according to claim 1, wherein in the step (1), the dehydrogenation treatment is carried out at 100 ℃ for 3-7 days.
5. The method for manufacturing a high temperature resistant fiber drawing tower grating sensing optical fiber according to claim 1, wherein the regeneration carbonization treatment of step (2) and the metal coating and curing of step (3) are continuous treatments, and the advancing rate of the optical fiber is 1-2 m/min.
6. The method for preparing a high temperature resistant fiber drawing tower grating sensing optical fiber according to claim 5, wherein in the step (2), the protective atmosphere is nitrogen; the regeneration carbonization treatment is carried out in a tube furnace, and the length of the tube furnace is 8-12 m.
7. The method for preparing a high temperature resistant fiber drawing tower grating sensing optical fiber according to claim 1, wherein the metal is silver or copper, the resin is polyacrylate, and the organic solvent is isopropanol.
8. The method for producing a high temperature resistant fiber drawing tower grating sensor fiber according to claim 1, wherein in the step (3), the curing is performed under a protective atmosphere; the curing comprises two-stage curing, wherein the temperature of the first-stage curing is 150-180 ℃, and the temperature of the second-stage curing is 1000-1100 ℃.
9. The high temperature resistant fiber for fiber bragg grating sensor according to any one of claims 1 to 8, wherein the reflectivity of the fiber bragg grating in the fiber bragg grating sensor is 1% -1 ‱.
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| CN114660706A (en) | 2022-06-24 |
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