CN115784600B - Porous optical fiber preform deposition device and method - Google Patents
Porous optical fiber preform deposition device and method Download PDFInfo
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- CN115784600B CN115784600B CN202211215283.2A CN202211215283A CN115784600B CN 115784600 B CN115784600 B CN 115784600B CN 202211215283 A CN202211215283 A CN 202211215283A CN 115784600 B CN115784600 B CN 115784600B
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- 230000008021 deposition Effects 0.000 title claims abstract description 53
- 239000013307 optical fiber Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 19
- 238000000151 deposition Methods 0.000 claims abstract description 61
- 239000010410 layer Substances 0.000 claims abstract description 34
- 238000005253 cladding Methods 0.000 claims abstract description 32
- 239000012792 core layer Substances 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000005137 deposition process Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000005373 porous glass Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- 102100036466 Delta-like protein 3 Human genes 0.000 description 1
- 101710112748 Delta-like protein 3 Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention discloses a deposition device of a porous optical fiber preform, which comprises a cavity for deposition reaction, wherein the cavity is connected with an exhaust port, a lateral air inlet and a bottom air inlet, a suspender extending into the cavity from the upper part is connected with a rotating chuck and a lifting structure, 3 torches are arranged below the cavity and are respectively a core layer torch, an intermediate layer torch and a cladding layer torch, different torches are provided with independent feeding systems, the cladding layer torch is provided with a device for rotating and adjusting an angle, a CCD (charge coupled device) detector is arranged outside the cavity, images of deposition areas of the torches are acquired, and an image processing device is used for identifying and calculating the outer diameter distribution of the deposition areas. The invention has higher deposition rate, can realize the manufacture of the core rod with three-layer refractive index profile distribution, and can keep the thickness and the density of each deposition layer uniform.
Description
Technical Field
The invention relates to a porous optical fiber preform deposition device and a porous optical fiber preform deposition method, and belongs to the technical field of porous optical fiber preform manufacturing.
Background
Currently, the manufacturing process of the porous optical fiber preform mainly comprises two methods, namely OVD and VAD. The VAD process is mainly used for manufacturing the core layer and part of the cladding layer of the optical fiber preform, and the OVD process is mainly used for manufacturing the outer cladding layer part of the optical fiber preform. The OVD process is to deposit the core layer and then the cladding layer by reciprocating the burner and the target rod in the diameter direction of the preform, and a great deal of literature discloses a multi-burner deposition device and a multi-burner deposition method by using the OVD process. The VAD process adopts a mode of simultaneously depositing a core layer and a cladding layer, and the deposition direction is the length direction of the preform. And (3) double-burner deposition, wherein one burner deposits a core layer, and the other burner deposits an inner cladding layer.
In related domestic patents, VAD processes mostly employ dual-burner deposition, where one burner deposits the core layer and the other burner deposits the inner cladding layer. For example, chinese patent CN108929031B and CN107601839a, both use dual-torch deposition, only optical fiber preforms with simple profile can be manufactured, and the deposition rate of the device is limited. In related foreign patents, some VAD processes employ multi-torch deposition. For example, in US20200095156A1 and JP5697165B2, a three-torch is used to deposit a porous optical fiber preform, but the deposition rate and the utilization rate are improved, but the dynamic control effects of the thickness, density, etc. of the deposited layers of different torches are poor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a porous optical fiber preform deposition device and a method for depositing a porous optical fiber preform by using the device through a VAD process, which can deposit a relatively complex section, has a higher deposition rate and has uniform thickness and density of different deposition layers in the length direction.
In order to achieve the technical purpose, the invention adopts the technical means that: the utility model provides a porous optical fiber perform deposition device, includes the cavity that is used for the deposition reaction, sets up the target stick above the cavity, sets up three blowlamps below the cavity, be respectively the core layer blowlamp of lower part, be located intermediate level blowlamp in middle part, be located the cladding blowlamp of upper portion, three blowlamps are connected respectively independent feed system, and the cladding blowlamp is connected angle rotation regulation subassembly, the perform is installed on the target stick, adopts the three-layer structure distribution that corresponds with the blowlamp; the CCD detector for collecting the deposition area of the blast lamp is arranged outside the cavity, the CCD detector transmits collected data to the image processing assembly, the outer diameter distribution of the deposition area is identified and calculated, the image processing assembly is connected with the PID controller, and the PID controller forms closed-loop adjustment according to the lifting speed of the cavity, the flow of raw materials and the angle of the blast lamp of the cladding, and the closed-loop adjustment is fed back and adjusted in real time.
Further, an exhaust port is arranged on one side of the cavity, a lateral air inlet is arranged on the side opposite to the exhaust port, and a bottom air inlet is arranged at the bottom of the cavity; the target rod is clamped by a suspender extending into the cavity, and the suspender is connected with the rotating chuck and the lifting mechanism and is used for lifting and rotating the cavity.
Further, the rotation angle of the angle rotation adjusting component ranges from-30 degrees to 30 degrees, wherein 0 degrees is expressed as being perpendicular to the center line of the loose body.
Further, the direction of the CCD detector for collecting the image is vertical to the plane of the blast lamp.
The method for preparing the porous optical fiber preform by the device for depositing the porous optical fiber preform by the VAD process comprises the following steps:
In the preparation stage, a target rod is arranged on a suspender, a rotary chuck and a lifting mechanism are started, a blast lamp is ignited, and a cavity is closed;
in the initial deposition stage, all feeding systems are started, the angle of a cladding blowtorch is-20 degrees, and the lifting speed is gradually changed from zero to a preset stable speed;
along with the progress of deposition, the porous glass matrix deposited on the lower end of the target rod in the axial direction is gradually lengthened, the distribution image of the outer diameter acquired by the CCD detector is conveyed to the image processing assembly, and after the area S1 of the core layer deposition area is larger than a preset value, the lifting speed of the target rod is controlled by the PID controller to be accelerated;
when the diameter d2 of the middle layer is larger or smaller than a set value, the flow of the MFC2 feeding is controlled to be reduced or increased through a PID controller to adjust;
When the diameter d3 of the cladding is larger or smaller than a set value, the flow of the MFC3 feeding is controlled to be reduced or increased by a PID controller to adjust;
When the length H of the part with the uniform diameter of the middle layer is larger or smaller than a set value, the angle of the cladding blowtorch is controlled to be reduced or enlarged by a PID controller to be adjusted;
and after the deposition is carried out until the preset length is reached, the feeding system is closed, and the torch flame is extinguished.
Further, the lifting stable speed of the boom is 0.8-3.5 mm/min, and in the deposition process, the lifting speed is regulated by a PID controller on the basis of the stable speed.
Furthermore, the MFC preset stable flow of the blast lamp in the deposition process is a fixed value, and the MFC preset stable flow is adjusted on the basis of the fixed value through the PID controller.
Further, the preset area of the core layer deposition area is 400-800 mm 2.
The invention has the beneficial effects that: 1. three-blast lamp deposition is adopted, so that the deposition rate is improved; 2. the CCD detector is adopted to collect and calculate the distribution of the deposition areas in real time, and the thickness and the density of each deposition layer are uniform by dynamically changing the flow rate, the lifting speed and the angle of a cladding blowtorch; 3. realizing the manufacture of three layers of core rods with different refractive index profile distribution.
Drawings
FIG. 1 is a block diagram of an embodiment of the apparatus of the present invention;
FIG. 2 is a control diagram of an embodiment of the present invention;
Fig. 3 is a refractive index profile of an embodiment of the present invention.
In the figure: 11. cavity, 12, exhaust port, 13, lateral air inlet, 14, bottom air inlet, 21, preform core, 22, preform middle layer, 23, preform cladding, 31, core burner, 32, middle layer burner, 33, cladding burner, 41, target rod, 42, and hanger rod.
Detailed Description
The invention is described in more detail below, by way of example, with reference to the accompanying drawings:
The device for depositing the porous optical fiber preform by using the VAD process as shown in fig. 1 and 2 comprises a cavity 11 for deposition reaction, wherein the cavity is connected with an exhaust port 12, a lateral air inlet 13 and a bottom air inlet 14; a boom 42 extending into the cavity from above, a target rod 41 clamped on the boom, the upper end of the boom being connected with the spin chuck and the lifting structure; the lower part of the cavity is provided with 3 torches which are respectively a core layer torch 31, a middle layer torch 32 and a cladding layer torch 33, different torches are provided with independent feeding systems, and the cladding layer torch is provided with a device for rotating and adjusting the angle; the prefabricated rod adopts 3 layers of structures corresponding to the blast lamps, and the core layer blast lamps 31 are used for depositing and manufacturing the prefabricated rod core layer 21; the middle layer torch 32 is used for depositing and manufacturing the preform middle layer 22; the cladding torch 33 is used for depositing and manufacturing the preform cladding 23; a CCD detector is arranged outside the cavity to collect a torch deposition area; the image processing device is used for identifying and calculating the outer diameter distribution of the deposition area, and is characterized in that a PID closed-loop regulating system is formed between the image processing device and the angle of the lifting speed, the raw material flow and the cladding blowlamp, and the PID closed-loop regulating system can be fed back and regulated in real time.
An example of a three-layer refractive index profile is prepared as follows:
In the preparation stage, the target rod 41 is arranged on the suspender 42, the rotation is started, the torch is ignited, and the cavity is closed;
in the initial deposition stage, a feeding system is started, the angle of a cladding blowtorch is-20 degrees, and the lifting speed is gradually changed from zero to a preset stable speed, specifically 2mm/min;
Along with the progress of deposition, the porous glass matrix deposited on the lower end of the target rod in the axial direction becomes longer gradually, the distribution of the outer diameter can be acquired by the CCD, and after the area S1 of the core layer deposition area in the image processing device is larger than a preset value of 600mm 2, the lifting speed of the target rod is controlled by PID to be increased. After the diameter d2 of the middle layer is larger or smaller than the set value of 90mm, the flow of the feed MFC2 is reduced or increased through PID parameters to adjust. When the cladding diameter d3 is greater than or less than the set point 130mm, the flow rate of the feed MFC3 is adjusted by decreasing or increasing the PID parameter. After the length H of the part with uniform diameter of the middle layer is more than or less than a set value of 10mm, adjusting by reducing or increasing the angle of the cladding blowtorch through PID parameters;
closing the feeding system after the deposition is carried out until the preset length is reached, and extinguishing the torch flame;
the sintered optical fiber preform has a cross-sectional structure as shown in FIG. 3, wherein the relative refractive index difference Delta1 of the core layer is 0.35%, the relative refractive index difference Delta2 of the intermediate layer is-0.01%, and the relative refractive index difference Delta3 of the cladding layer is-0.06%.
The above embodiments are illustrative of the technical solution of the present invention, and cannot be used as a limitation of the technical solution of the present invention, and all the simple evolutions based on the technical solution disclosed by the present invention belong to the protection scope of the present invention.
Claims (4)
1. The utility model provides a porous optical fiber perform deposition device, includes the cavity that is used for the deposition reaction, sets up the target stick above the cavity, sets up three blowlamps below the cavity, be respectively the core layer blowlamp of lower part, be located intermediate level blowlamp in middle part, be located the cladding blowlamp of upper portion, three blowlamps are connected respectively independent feed system, and the cladding blowlamp is connected angle rotation regulation subassembly, the perform is installed on the target stick, adopts the three-layer structure distribution that corresponds with the blowlamp; the CCD detector is arranged outside the cavity and used for collecting the deposition area of the blast lamp, the CCD detector is used for transmitting collected data to the image processing assembly, the outer diameter distribution of the deposition area is identified and calculated, the image processing assembly is connected with the PID controller, and the PID controller forms closed-loop adjustment according to the lifting speed of the cavity, the flow of raw materials and the angle of the blast lamp of the cladding, and the closed-loop adjustment is fed back and adjusted in real time;
an exhaust port is arranged on one side of the cavity, a lateral air inlet is arranged on the opposite side of the exhaust port, and a bottom air inlet is arranged at the bottom of the cavity; the target rod is clamped by a suspender extending into the cavity, and the suspender is connected with the rotary chuck and the lifting mechanism and is used for lifting and rotating the cavity;
the rotation adjusting angle of the angle rotation adjusting component ranges from-30 degrees to 30 degrees, wherein 0 degree is expressed as being perpendicular to the center line of the loosening body;
the direction of the CCD detector for collecting the image is vertical to the plane of the blast lamp;
A method for preparing a holey optical fiber preform according to a holey optical fiber preform deposition apparatus, characterized by the steps of: in the preparation stage, a target rod is arranged on a suspender, a rotary chuck and a lifting mechanism are started, a blast lamp is ignited, and a cavity is closed; in the initial deposition stage, all feeding systems are started, the angle of a cladding blowtorch is-20 degrees, and the lifting speed is gradually changed from zero to a preset stable speed; along with the progress of deposition, the porous glass matrix deposited on the lower end of the target rod in the axial direction is gradually lengthened, the distribution image of the outer diameter acquired by the CCD detector is conveyed to the image processing assembly, and after the area S1 of the core layer deposition area is larger than a preset value, the lifting speed of the target rod is controlled by the PID controller to be accelerated; when the diameter d2 of the middle layer is larger or smaller than a set value, the flow of the MFC2 feeding is controlled to be reduced or increased through a PID controller to adjust; when the diameter d3 of the cladding is larger or smaller than a set value, the flow of the MFC3 feeding is controlled to be reduced or increased by a PID controller to adjust; when the length H of the part with the uniform diameter of the middle layer is larger or smaller than a set value, the angle of the cladding blowtorch is controlled to be reduced or enlarged by a PID controller to be adjusted;
and after the deposition is carried out until the preset length is reached, the feeding system is closed, and the torch flame is extinguished.
2. The method for preparing a holey optical fiber preform by using the holey optical fiber preform deposition apparatus according to claim 1, wherein: the lifting stable speed of the boom is 0.8-3.5 mm/min, and in the deposition process, the lifting speed is regulated by a PID controller on the basis of the stable speed.
3. The method for preparing a holey optical fiber preform by using the holey optical fiber preform deposition apparatus according to claim 1, wherein: and the MFC preset stable flow of the blast lamp in the deposition process is a fixed value, and is adjusted on the basis of the fixed value through a PID controller.
4. The method for preparing a holey optical fiber preform by using the holey optical fiber preform deposition apparatus according to claim 1, wherein: the preset area of the core layer deposition area is 400-800 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211215283.2A CN115784600B (en) | 2022-09-30 | 2022-09-30 | Porous optical fiber preform deposition device and method |
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| CN202211215283.2A CN115784600B (en) | 2022-09-30 | 2022-09-30 | Porous optical fiber preform deposition device and method |
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| Publication Number | Publication Date |
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| CN115784600A CN115784600A (en) | 2023-03-14 |
| CN115784600B true CN115784600B (en) | 2024-05-31 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2066800A (en) * | 2000-03-06 | 2001-09-13 | University Of Sydney, The | Method of fabricating a preform |
| CN106219961A (en) * | 2016-08-05 | 2016-12-14 | 长飞光纤光缆股份有限公司 | A kind of VAD prepares the device and method of preform |
| CN107540206A (en) * | 2017-10-13 | 2018-01-05 | 长飞光纤光缆股份有限公司 | VAD prepares the device and method of preform mother metal |
| CN113912279A (en) * | 2020-07-10 | 2022-01-11 | 中天科技精密材料有限公司 | Axial deposition doping device and preparation method of powder rod |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5399798B2 (en) * | 2008-07-18 | 2014-01-29 | 信越化学工業株式会社 | Optical fiber preform manufacturing method and optical fiber preform manufacturing apparatus |
| JP4750866B2 (en) * | 2009-02-18 | 2011-08-17 | 信越化学工業株式会社 | Method and apparatus for producing quartz glass |
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- 2022-09-30 CN CN202211215283.2A patent/CN115784600B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2066800A (en) * | 2000-03-06 | 2001-09-13 | University Of Sydney, The | Method of fabricating a preform |
| CN106219961A (en) * | 2016-08-05 | 2016-12-14 | 长飞光纤光缆股份有限公司 | A kind of VAD prepares the device and method of preform |
| CN107540206A (en) * | 2017-10-13 | 2018-01-05 | 长飞光纤光缆股份有限公司 | VAD prepares the device and method of preform mother metal |
| CN113912279A (en) * | 2020-07-10 | 2022-01-11 | 中天科技精密材料有限公司 | Axial deposition doping device and preparation method of powder rod |
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