CA1168434A - Burner for the production of preforms for optical fibers - Google Patents
Burner for the production of preforms for optical fibersInfo
- Publication number
- CA1168434A CA1168434A CA000391857A CA391857A CA1168434A CA 1168434 A CA1168434 A CA 1168434A CA 000391857 A CA000391857 A CA 000391857A CA 391857 A CA391857 A CA 391857A CA 1168434 A CA1168434 A CA 1168434A
- Authority
- CA
- Canada
- Prior art keywords
- burner
- hood
- flame
- preforms
- production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01413—Reactant delivery systems
- C03B37/0142—Reactant deposition burners
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/04—Multi-nested ports
- C03B2207/06—Concentric circular ports
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/40—Mechanical flame shields
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/42—Assembly details; Material or dimensions of burner; Manifolds or supports
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/46—Comprising performance enhancing means, e.g. electrostatic charge or built-in heater
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The extension tube at the outlet end of a burner used in the production of optical fiber preforms is provided with a heating device to raise the temperature of the interior of the tube and reduce the amount of glass particles deposited onto the tube.
The extension tube at the outlet end of a burner used in the production of optical fiber preforms is provided with a heating device to raise the temperature of the interior of the tube and reduce the amount of glass particles deposited onto the tube.
Description
68~3~
BACKGROUND OF THE Il~VE~TION
This invention relates to improvements in a burner for use in the production of preforms for optical fibers.
BRIEF DESCRIPTION OF THE DRAWINGS
.
ReEerence will now be made to the accompanying drawings in which:
Fig. 1 is a schematic view illustrating the production of an optical fiber preform with a conventional concentric multiple tip burner;
Fig. 2 i5 a schematic perspective view of a conventional concentric multiple tip burner e~uipped with a hood; and Fig. 3 is a longitudinal sectional view of the burner of this invention.
A gas phase axial deposit method is one known method of producing optical fiber preforms. In accordance with this method, as illustrated in Fig. 1, a glass-forming gaseous feedstoc]c (containing a dopant), combustible gas, oxygen gas, etc. are .swpplied over a concentric multiple tip burner 1 to form a flame 3 containing fine glass particles 2, and the fine glass particles
BACKGROUND OF THE Il~VE~TION
This invention relates to improvements in a burner for use in the production of preforms for optical fibers.
BRIEF DESCRIPTION OF THE DRAWINGS
.
ReEerence will now be made to the accompanying drawings in which:
Fig. 1 is a schematic view illustrating the production of an optical fiber preform with a conventional concentric multiple tip burner;
Fig. 2 i5 a schematic perspective view of a conventional concentric multiple tip burner e~uipped with a hood; and Fig. 3 is a longitudinal sectional view of the burner of this invention.
A gas phase axial deposit method is one known method of producing optical fiber preforms. In accordance with this method, as illustrated in Fig. 1, a glass-forming gaseous feedstoc]c (containing a dopant), combustible gas, oxygen gas, etc. are .swpplied over a concentric multiple tip burner 1 to form a flame 3 containing fine glass particles 2, and the fine glass particles
2~ 2 in the flame 3 are deposited on a seed bar 4 while the latter is rotating to obtain a preform 5 for optical fibers. The thus obtained preform 5 is heated and sintered, and is subjected to heat drawing to produce an optical fiber.
The use of the preform 5 produced by the above method enables graded-index type optical fibers having excellent trans-mission characteristics to be obtained, particularly optical fibers which are excellent in transmission distortion. In order to consistently produce high ~uality glass preforms for optical fibers by the above described method, it is necessary that the temperature distribution and dopant distribution in the flame 3 - 1 - ~
~61~3~
l .
1 be stabilized. In the burner as illustra-ted in Fig. 1, however, the flame 3 is swayed by the environmental gas flow and by dif-fusion of jetted gasesl causing changes in the temperature dis-tribution and dopant distribution in the flame 3.
Attempts have been made to stabilize the flame 3 by pro-viding a hood 6 to the top of the concentric multiple tip burner 1 as shown in Fig. 2. The fine glass particles 2 formed in -the flame 3, however, readily deposit on the inner wall sur-face of the hood 6, and the thus deposited fine glass particles disturb the flame 3, causing changes in the temperature dis-tribution and dopant distribution of the flame 3 and also of thepreform 5.
S~JM~ARY OF THE INVENTION
~ n object of this invention is to keep stability of the flame in a burner for use in the production of preforms for optical fibers, and to allow consistent production of high quality preforms for optical Eibers.
Briefly, in order to attain the above object the invention is characterized in -that a concentric multiple tip burner is provided with a c~lindrical member extending forward from the top periphery thereof, and the cylindrical member is equipped with a heating apparatus to heat the inner wall surface thereof.
As described above, the inventor's experiments have revealed that fine glass particles formed in the Elame gradually deposit on the inner wall surface of the top of the hood mounted on the burner. It has been further found, however, that when the hood portion is heated, the tcndency of the fineglass particles to deposit on the inner wall surface of the top of the hood is reduced, as the temperatureC; o~ the inner walls of the hood is ~fi~1~3~
increased, the eEfect of this reduction is enhanced. This invention provides a burner for the produc-tion of fine glass particles utilizing the above described phenomenon.
Hereinafter, an embodiment of the burner of this invention will be explained with reference to the accompanying drawings as described hereinbefore.
DET~ILED DESCRIPTION OF THE INVENTION
Fig. 3 shows a longitudinal sectional view of an embod-iment of this invention. The main body of a burner l' is com-~
1~ posed of concentric tubes 7a, 7b, 7c, 7d, and 7e having differentdiameters. 8a is a gas feed path for the central tube 7a, and 8b , 8c, 8d and 8e are gas feed paths which are disposed con-centrically around the gas feed path 8a. 9a, 9b, 9c, 9d and 9e are gas feed inlets connected to the gas feed paths 8a, 8b, 8c, 8d and 8e, respectively. To the gas feed paths 8a to 8d are fed a feed gas combustible gas, oxygen gas, etc., and a flame is formed at the outlet (right-hand end in Fig. 3) containing fine glass particles therein.
A hood ll as the cylindrical member is attached to the top section of the burner l' through a spacer lO. The hood ll extends forward from the top of the burner l'. As the length of the hood ll is increased, the stability of the flame in the hood 11 is increased. I-~ is necessary that the material of the hood l have a high melting point, excellent corrosion resistivity, and high resistance to thermal impact. An example of such a mat-erial is zirconia (zirconium oxide). In order to heat an inner wall surface lla of the hood ll to high temperatures, a heating appara-tus 12 is provided on the outside of the hood ll. In this embodiment, high frequency induction heating is utilized as the heating apparatus 12, and 13 is a high frequency working coil.
The coil 13 is tu~ular so that cooling liquid can be passed therethrough.
The use of the preform 5 produced by the above method enables graded-index type optical fibers having excellent trans-mission characteristics to be obtained, particularly optical fibers which are excellent in transmission distortion. In order to consistently produce high ~uality glass preforms for optical fibers by the above described method, it is necessary that the temperature distribution and dopant distribution in the flame 3 - 1 - ~
~61~3~
l .
1 be stabilized. In the burner as illustra-ted in Fig. 1, however, the flame 3 is swayed by the environmental gas flow and by dif-fusion of jetted gasesl causing changes in the temperature dis-tribution and dopant distribution in the flame 3.
Attempts have been made to stabilize the flame 3 by pro-viding a hood 6 to the top of the concentric multiple tip burner 1 as shown in Fig. 2. The fine glass particles 2 formed in -the flame 3, however, readily deposit on the inner wall sur-face of the hood 6, and the thus deposited fine glass particles disturb the flame 3, causing changes in the temperature dis-tribution and dopant distribution of the flame 3 and also of thepreform 5.
S~JM~ARY OF THE INVENTION
~ n object of this invention is to keep stability of the flame in a burner for use in the production of preforms for optical fibers, and to allow consistent production of high quality preforms for optical Eibers.
Briefly, in order to attain the above object the invention is characterized in -that a concentric multiple tip burner is provided with a c~lindrical member extending forward from the top periphery thereof, and the cylindrical member is equipped with a heating apparatus to heat the inner wall surface thereof.
As described above, the inventor's experiments have revealed that fine glass particles formed in the Elame gradually deposit on the inner wall surface of the top of the hood mounted on the burner. It has been further found, however, that when the hood portion is heated, the tcndency of the fineglass particles to deposit on the inner wall surface of the top of the hood is reduced, as the temperatureC; o~ the inner walls of the hood is ~fi~1~3~
increased, the eEfect of this reduction is enhanced. This invention provides a burner for the produc-tion of fine glass particles utilizing the above described phenomenon.
Hereinafter, an embodiment of the burner of this invention will be explained with reference to the accompanying drawings as described hereinbefore.
DET~ILED DESCRIPTION OF THE INVENTION
Fig. 3 shows a longitudinal sectional view of an embod-iment of this invention. The main body of a burner l' is com-~
1~ posed of concentric tubes 7a, 7b, 7c, 7d, and 7e having differentdiameters. 8a is a gas feed path for the central tube 7a, and 8b , 8c, 8d and 8e are gas feed paths which are disposed con-centrically around the gas feed path 8a. 9a, 9b, 9c, 9d and 9e are gas feed inlets connected to the gas feed paths 8a, 8b, 8c, 8d and 8e, respectively. To the gas feed paths 8a to 8d are fed a feed gas combustible gas, oxygen gas, etc., and a flame is formed at the outlet (right-hand end in Fig. 3) containing fine glass particles therein.
A hood ll as the cylindrical member is attached to the top section of the burner l' through a spacer lO. The hood ll extends forward from the top of the burner l'. As the length of the hood ll is increased, the stability of the flame in the hood 11 is increased. I-~ is necessary that the material of the hood l have a high melting point, excellent corrosion resistivity, and high resistance to thermal impact. An example of such a mat-erial is zirconia (zirconium oxide). In order to heat an inner wall surface lla of the hood ll to high temperatures, a heating appara-tus 12 is provided on the outside of the hood ll. In this embodiment, high frequency induction heating is utilized as the heating apparatus 12, and 13 is a high frequency working coil.
The coil 13 is tu~ular so that cooling liquid can be passed therethrough.
- 3 -, . .
~6~3~34 t In the production of preforms for optical Eibers by the use of the burner 1' r the inner wall surface lla of the hood 11 is heated with the above described heating apparatus 12 during the formation of the flame. When the temperature of the inner wall surface lla is increased, it becomes more difficult for the fine glass particles from the flame to adhere to the inner wall surface of the hood. In contrast, in a conven-tional hooded burner, the deposition of fine glass particles occurs readily, particularly at the top section of the hood 11. It is therefore desirable to increase the temperature of the top sec-tion of the hood 11 to particularly high levels. For this pur pose, the coil pitch, i.e. the distance between turns, of the high frequency working coil 13 in the top section of the hood 11 may be narrowed, or the thickness of the top section of the hood 11 may be reduced.
As described hereinbefore with reference to one embodiment of this invention, the burner for the production of preforms for optical ibers according to the invention prevents or at least substantially reduces the deposition of fine glass particles onto the inner wall surface of the hood. -This prevents the swinging and the change of the flame, stabilizes the temperature distribution and dopant distribution in the flame and permits the production of optical fiber preforms of consistent quality.
~6~3~34 t In the production of preforms for optical Eibers by the use of the burner 1' r the inner wall surface lla of the hood 11 is heated with the above described heating apparatus 12 during the formation of the flame. When the temperature of the inner wall surface lla is increased, it becomes more difficult for the fine glass particles from the flame to adhere to the inner wall surface of the hood. In contrast, in a conven-tional hooded burner, the deposition of fine glass particles occurs readily, particularly at the top section of the hood 11. It is therefore desirable to increase the temperature of the top sec-tion of the hood 11 to particularly high levels. For this pur pose, the coil pitch, i.e. the distance between turns, of the high frequency working coil 13 in the top section of the hood 11 may be narrowed, or the thickness of the top section of the hood 11 may be reduced.
As described hereinbefore with reference to one embodiment of this invention, the burner for the production of preforms for optical ibers according to the invention prevents or at least substantially reduces the deposition of fine glass particles onto the inner wall surface of the hood. -This prevents the swinging and the change of the flame, stabilizes the temperature distribution and dopant distribution in the flame and permits the production of optical fiber preforms of consistent quality.
Claims (3)
1. A burner for the production of preforms for optical.
fibers, said burner having a main body portion having an outlet end at which a flame is produced and a cylindrical hood member extending from said outlet end, the improvement comprising heating means other than said flame for heating said cylindrical hood member.
fibers, said burner having a main body portion having an outlet end at which a flame is produced and a cylindrical hood member extending from said outlet end, the improvement comprising heating means other than said flame for heating said cylindrical hood member.
2. A burner as claimed in claim 1, wherein said heating means is disposed around the exterior of said hood member.
3. A burner as claimed in claim 1, wherein said main body comprises a plurality of concentric tubular passages.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17472480A JPS57100928A (en) | 1980-12-12 | 1980-12-12 | Burner for preparing base material for optical fiber |
| JP174724/80 | 1980-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1168434A true CA1168434A (en) | 1984-06-05 |
Family
ID=15983539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391857A Expired CA1168434A (en) | 1980-12-12 | 1981-12-09 | Burner for the production of preforms for optical fibers |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS57100928A (en) |
| CA (1) | CA1168434A (en) |
| DE (1) | DE3149167C2 (en) |
| FR (1) | FR2496231B1 (en) |
| GB (1) | GB2092738B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4428760A (en) * | 1982-03-25 | 1984-01-31 | International Telephone And Telegraph Corporation | Oxyhydrogen flame torch for optical fiber drawing |
| DE3417438A1 (en) * | 1984-05-11 | 1985-11-14 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | METHOD AND DEVICE FOR PRODUCING AN AEROSOL FLOW |
| DE3427323A1 (en) * | 1984-07-25 | 1986-03-27 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | METHOD FOR PRODUCING A AEROSOL FLOW |
| JPS6168330A (en) * | 1984-09-07 | 1986-04-08 | Furukawa Electric Co Ltd:The | Formation of fine particle of optical glass |
| AU583588B2 (en) * | 1985-02-06 | 1989-05-04 | Sumitomo Electric Industries, Ltd. | Gas reaction apparatus and multi-wall pipe type burner therefor |
| JPH0667764B2 (en) * | 1985-05-27 | 1994-08-31 | 古河電気工業株式会社 | Burner for producing fine glass particles |
| CN104649577B (en) * | 2015-02-12 | 2017-03-01 | 江苏通鼎光棒有限公司 | A kind of apparatus and method that VAD and OVD flame temperature is carried out with on-line tuning |
| JP2023083805A (en) * | 2021-12-06 | 2023-06-16 | 住友電気工業株式会社 | Manufacturing equipment for glass fine particle deposits |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2313327A1 (en) * | 1975-06-06 | 1976-12-31 | Quartz & Silice | VERY HIGH PURITY GLASS PREPARATION PROCESS USED IN PARTICULAR FOR THE MANUFACTURE OF OPTICAL FIBERS |
| CH620181A5 (en) * | 1975-08-16 | 1980-11-14 | Heraeus Schott Quarzschmelze | Process for the preparation of synthetic quartz glass, apparatus to carry out the process, and the use of the synthetic quartz glass |
| DE2605483A1 (en) * | 1976-02-12 | 1977-08-18 | Licentia Gmbh | Photoconductor having radially decreasing refractive index - formed on heated rotating glass rod using heat decomposing gases |
| JPS52121341A (en) * | 1976-04-06 | 1977-10-12 | Nippon Telegr & Teleph Corp <Ntt> | Production of optical fiber base materials and production apparatus fo r the same |
| JPS5927728B2 (en) * | 1977-08-11 | 1984-07-07 | 日本電信電話株式会社 | Manufacturing method of sooty glass rod |
-
1980
- 1980-12-12 JP JP17472480A patent/JPS57100928A/en active Pending
-
1981
- 1981-12-04 GB GB8136676A patent/GB2092738B/en not_active Expired
- 1981-12-09 CA CA000391857A patent/CA1168434A/en not_active Expired
- 1981-12-11 FR FR8123223A patent/FR2496231B1/en not_active Expired
- 1981-12-11 DE DE19813149167 patent/DE3149167C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3149167C2 (en) | 1984-04-05 |
| JPS57100928A (en) | 1982-06-23 |
| FR2496231B1 (en) | 1986-12-05 |
| GB2092738B (en) | 1984-08-22 |
| FR2496231A1 (en) | 1982-06-18 |
| GB2092738A (en) | 1982-08-18 |
| DE3149167A1 (en) | 1982-10-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |