CN112194360B - Device for monitoring abnormal sintering of optical fiber preform and monitoring method thereof - Google Patents
Device for monitoring abnormal sintering of optical fiber preform and monitoring method thereof Download PDFInfo
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- CN112194360B CN112194360B CN202011279899.7A CN202011279899A CN112194360B CN 112194360 B CN112194360 B CN 112194360B CN 202011279899 A CN202011279899 A CN 202011279899A CN 112194360 B CN112194360 B CN 112194360B
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- core tube
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- 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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
- C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
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- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention provides a device for monitoring whether optical fiber preform sintering is abnormal or not, which monitors and discovers the abnormal condition in the early sintering stage as early as possible, stops the production process in time, reduces the production cost, reduces the waste circulation time and reduces the risk of production accidents. The device comprises a furnace core tube, wherein an inner cavity of the furnace core tube is used for sintering an optical fiber preform, the bottom of the furnace core tube is supported on a carrying platform, a gap strip is arranged at a section position corresponding to one radius of the furnace core tube on the carrying platform, a laser tester is arranged right below the carrying platform, a detection part of the laser tester is arranged right above the direction, the bottom of the laser tester is fixedly arranged at an output end of a horizontal moving device, the horizontal moving device drives the detection part of the laser tester to reciprocate radially along the gap strip from the central axis position of the filter core tube, and the detection part monitors the shape of the lower end of the preform after penetrating through the gap strip and penetrating through a glass bottom plate of the filter core tube.
Description
Technical Field
The invention relates to the technical field of optical fiber perform sintering monitoring, in particular to a device for monitoring whether optical fiber perform sintering is abnormal or not, and also provides a method for monitoring by adopting the device.
Background
With the national policy support of the information industry, the optical communication industry is rapidly developed, single mode optical fibers are widely used, and prefabricated soot rods are generated by using an axial vapor deposition (VAD) method and an external vapor deposition (OVD) method.
The prefabricated ash stick is put into a furnace core pipe for sintering treatment, the sintering comprises a plurality of processes, each process consumes much time and much material, the furnace core pipe has strong light during heating, the change condition of the ash stick cannot be monitored by naked eyes or a camera and the like, and the technology for monitoring the sintering process of the ash stick is temporarily in a blank stage. In the preparation process in the field, once the soot rod is put into the furnace core tube, the sintering effect can be seen only after tens of hours, and the soot rod can be taken out after the production is finished, if the soot rod is damaged in the process and can not be found in time, the soot rod with the lost use performance can still continuously undergo the subsequent sintering step, and a great amount of resource waste can be caused. In view of the foregoing, it is necessary to develop a device for monitoring the sintering process of soot rods.
Disclosure of Invention
In order to solve the problems, the invention provides a device for monitoring whether the sintering of an optical fiber preform is abnormal, which monitors and discovers the abnormal condition in the early sintering stage as soon as possible, stops the production process in time, reduces the production cost, reduces the waste circulation time and reduces the risk of production accidents.
A device for monitoring whether optical fiber perform sintering is abnormal, characterized in that: the device comprises a furnace core tube, wherein an inner cavity of the furnace core tube is used for sintering an optical fiber preform, the bottom of the furnace core tube is supported on a carrying platform, a gap strip is arranged at a section position corresponding to one radius of the furnace core tube on the carrying platform, a laser tester is arranged right below the carrying platform, a detection part of the laser tester is arranged right above the direction, the bottom of the laser tester is fixedly arranged at an output end of a horizontal moving device, the horizontal moving device drives the detection part of the laser tester to reciprocate radially along the gap strip from the central axis position of the filter core tube, and the detection part monitors the shape of the lower end of the preform after penetrating through the gap strip and penetrating through a glass bottom plate of the filter core tube.
It is further characterized by: the support frame is characterized in that the support frame is supported by the support frame, the horizontal moving device is arranged at the position of the corresponding cross rod of the support frame, the support frame is integrally arranged at the output end of the rotary platform, the rotary platform synchronously drives the support frame and the horizontal moving device to rotate, the furnace core tube does not rotate, the furnace core tube is enabled to be partially shielded by dropped powder, and when the laser tester cannot monitor, the support frame of the furnace core tube and the laser tester synchronously rotate to the part which is not shielded by the powder, and monitoring is continued.
A method for monitoring whether the optical fiber preform is abnormally sintered by adopting a device for monitoring whether the optical fiber preform is abnormally sintered is characterized in that: the method comprises the steps that curve data monitored by a laser tester for sintering a preform of a corresponding model are imported into standard data of a data comparison module in advance, then the laser monitor is started in the sintering process of the preform, the sintered preform is monitored in real time through the laser monitor, the laser monitor moves back and forth in the radial direction of a gap strip from the central axis position of a filter core tube at a detection part, the real-time monitoring curve fed back in real time is fed back to the data comparison module by the laser monitor, the data comparison module is used for comparing the real-time monitoring curve with the standard data, when the difference of distance curves obtained by feeding back soot rods in different monitoring states is large, sintering abnormality is judged, and sintering is stopped.
It is further characterized by:
when the soot rod begins to fall off in the early stage of the sintering process, the falling powder covers the bottom of the furnace core tube, and after the real-time monitoring curve obtained by feedback is consistent with the curve in the standard data shielded by the powder, the carrier and the laser tester rotate simultaneously, so that the laser tester monitors the bottom of the furnace core tube which is not shielded by the powder, and the monitoring is continuous and reliable;
the horizontal moving device drives the laser tester to horizontally reciprocate, the laser traversing distance is displayed on the abscissa of the curve data, the detection distance is displayed on the ordinate of the curve data, the detection distance is a distance value from the laser transmitting end to the corresponding lower end position of the soot rod, and whether sintering is normal or not is detected by comparing the values of the laser traversing distance and the detection distance.
After the invention is adopted, the horizontal moving device drives the detection part of the laser tester to reciprocate along the radial direction of the empty strip from the central axis position of the filter core tube, the detection part monitors the lower end shape of the preform rod after penetrating through the empty strip and penetrating through the glass bottom plate of the filter core tube, the laser point moves outwards along the radial direction from the center of the furnace core tube to obtain the diameter change trend of the soot rod, when the diameter change trend of the soot rod is different from the normal trend, the abnormal sintering is judged after the shielded body is eliminated, the sintering is stopped, the abnormal sintering at the early stage of sintering is detected and detected as soon as possible, the production process is stopped in time, the production cost is reduced, the waste circulation time is reduced, and the production accident risk is reduced.
Drawings
FIG. 1 is a schematic and schematic illustration of the apparatus of the present invention;
FIG. 2 is a schematic top view of a stage;
FIG. 3 is a schematic view of monitoring a complete soot rod;
FIG. 4 is a graph of curve data for an embodiment of a completed soot rod;
FIG. 5 is a schematic view of monitoring a normally sintered soot rod;
FIG. 6 is a graph of the sintering process for a normally sintered soot rod;
FIG. 7 is a schematic illustration of detection of a surface burst soot stick;
FIG. 8 is a graph of the graph data for a surface burst soot rod;
FIG. 9 is a schematic diagram of the detection of a significant amount of burn-through after vitrification;
FIG. 10 is a graph corresponding to FIG. 9;
FIG. 11 is a graph of curve data for occlusion detection corresponding to loose body shedding;
the names corresponding to the serial numbers in the figures are as follows:
furnace core tube 1, carrier 2, vacancy strip 3, laser tester 4, horizontal mobile device 5, supporting rack 6, horizontal pole 7, rotary platform 8.
Detailed Description
An apparatus for monitoring whether optical fiber preform sintering is abnormal is shown in fig. 1 to 11: the device comprises a furnace core tube 1, wherein an inner cavity of the furnace core tube 1 is used for sintering an optical fiber preform, the bottom of the furnace core tube 1 is supported on a carrying platform 2, a gap strip 3 is arranged at a section position, corresponding to one radius of the furnace core tube 1, of the carrying platform 2, a laser tester 4 is arranged right below the carrying platform 2, a detection part of the laser tester 4 is arranged right above the carrying platform, the bottom of the laser tester 4 is fixedly arranged at an output end of a horizontal moving device 5, the horizontal moving device 5 drives the detection part of the laser tester 4 to reciprocate radially along the gap strip 3 from the central axis position of the filter core tube 1, and the detection part penetrates through the gap strip 3 and monitors the shape of the lower end of the preform after penetrating through a glass bottom plate of the filter core tube 1.
The carrier 2 is supported on the supporting frame 6, the horizontal moving device 5 is arranged at the position of the corresponding cross rod 7 of the supporting frame 6, the supporting frame 6 is integrally arranged at the output end of the rotating platform 8, the rotating platform 8 synchronously drives the carrier 2 and the horizontal moving device 5 to rotate, the furnace core tube 1 does not rotate, (in the specific implementation, the periphery of the bottom of the furnace core tube is supported on the corresponding upper ring of the bearing, the lower ring of the bearing is embedded on the corresponding surface of the carrier, so that the furnace core tube cannot rotate during the rotation of the carrier), the carrier 2 and the laser tester 4 synchronously rotate until the part which is not blocked by the powder is blocked, and the monitoring is continued when the laser tester 4 cannot monitor.
A method for monitoring whether optical fiber perform sintering is abnormal by adopting a device for monitoring whether the optical fiber preform is abnormal or not comprises the following steps: the method comprises the steps that curve data monitored by a laser tester for sintering a preform of a corresponding model are imported into standard data of a data comparison module in advance, then the laser monitor is started in the sintering process of the preform, the sintered preform is monitored in real time through the laser monitor, the laser monitor moves back and forth in the radial direction of a gap strip from the central axis position of a filter core tube at a detection part, the real-time monitoring curve fed back in real time is fed back to the data comparison module by the laser monitor, the data comparison module is used for comparing the real-time monitoring curve with the standard data, when the difference of distance curves obtained by feeding back soot rods in different monitoring states is large, sintering abnormality is judged, and sintering is stopped.
When the soot rod begins to fall off in the early stage of the sintering process, the falling powder covers the bottom of the furnace core tube, and after the real-time monitoring curve obtained by feedback is consistent with the curve in the standard data shielded by the powder, the carrier and the laser tester rotate simultaneously, so that the laser tester monitors the bottom of the furnace core tube which is not shielded by the powder, and the monitoring is continuous and reliable;
the horizontal moving device drives the laser tester to horizontally reciprocate, the laser traversing distance is displayed on the abscissa of the curve data, the detection distance is displayed on the ordinate of the curve data, the detection distance is a distance value from the laser transmitting end to the corresponding lower end position of the soot rod, and whether sintering is normal or not is detected by comparing the values of the laser traversing distance and the detection distance.
The specific implementation method comprises the following steps: the method comprises the steps of importing curve data of a complete soot rod, curve data of a normal sintering process and curve data of shielded detection into a data comparison module, starting a laser monitor in the sintering process of the preform, monitoring the sintered preform in real time through the laser monitor, feeding back real-time monitoring curves fed back in real time to the data comparison module by the laser monitor in the detection part along the radial direction of a blank strip from the central axis position of the filter core, and comparing the real-time monitoring curves with standard data by the data comparison module according to the real-time monitoring curves, judging sintering abnormality when the difference of distance curves fed back by the soot rod in different states is large, stopping sintering, and particularly, judging that the sintering abnormality is surface burst (see fig. 7 and 8) or a large number of unburnt soot particles after vitrification (fig. 9 and 10).
When the soot rod begins to fall off in the early stage of the sintering process, the fallen powder covers the bottom of the furnace core tube, and the real-time monitoring curve obtained by feedback is consistent with the curve (see figure 11) in the standard data shielded by the powder, the carrier and the laser tester rotate simultaneously, so that the laser tester monitors the bottom of the furnace core tube which is not shielded by the powder, and the monitoring is continuously and reliably operated
The working principle is as follows: the horizontal moving device drives the detection part of the laser tester to reciprocate radially along the vacancy strip from the central axis of the filter core tube, the detection part monitors the lower end shape of the preform rod after penetrating the vacancy strip and penetrating the glass bottom plate of the filter core tube, the laser point moves radially outwards from the center of the furnace core tube to obtain the diameter change trend of the soot rod, when the diameter change trend of the soot rod is different from the normal trend, the sintering is judged to be abnormal and stopped after the shielded body is eliminated, the monitoring is carried out and the abnormality in the early sintering stage is found as early as possible, the production process is stopped in time, the production cost is reduced, the waste circulation time is reduced, and the production accident risk is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (1)
1. A method for monitoring whether the optical fiber preform is abnormally sintered by adopting a device for monitoring whether the optical fiber preform is abnormally sintered is characterized in that:
the device for monitoring whether the optical fiber preform is abnormally sintered comprises a furnace core tube, wherein an inner cavity of the furnace core tube is used for sintering the optical fiber preform, the bottom of the furnace core tube is supported on a carrying platform, a gap strip is arranged on the carrying platform corresponding to the position of the section of one radius of the furnace core tube, a laser tester is arranged right below the carrying platform, a detection part of the laser tester is arranged right above the carrying platform, the bottom of the laser tester is fixedly arranged at the output end of a horizontal moving device, the horizontal moving device drives the detection part of the laser tester to reciprocate radially along the gap strip from the central axis position of the furnace core tube, and the detection part monitors the shape of the lower end of the preform after penetrating through the gap strip and penetrating through a glass bottom plate of the furnace core tube; the support platform is supported on a support frame, the horizontal moving device is arranged at the position of a corresponding cross rod of the support frame, the support frame is integrally arranged at the output end of the rotary platform, and the rotary platform synchronously drives the support platform and the horizontal moving device to rotate and the furnace core tube does not rotate;
the method specifically comprises the following steps of importing curve data monitored by a laser tester for sintering a preform of a corresponding model into standard data of a data comparison module in advance, starting the laser monitor in the sintering process of the preform, monitoring the sintered preform in real time by the laser monitor, feeding back a real-time monitoring curve fed back in real time to the data comparison module by the laser monitor in the radial reciprocating manner along a blank strip at the central axis position of a detection part of a furnace core tube, and judging sintering abnormality when the difference of distance curves fed back by soot rods in different monitoring states is large according to the real-time monitoring curve and the standard data comparison module, and stopping sintering;
when the soot rod begins to fall off in the early stage of the sintering process, the falling powder covers the bottom of the furnace core tube, and after the real-time monitoring curve obtained by feedback is consistent with the curve in the standard data shielded by the powder, the carrier and the laser tester rotate simultaneously, so that the laser tester monitors the bottom of the furnace core tube which is not shielded by the powder, and the monitoring is continuous and reliable;
the horizontal moving device drives the laser tester to horizontally reciprocate, the laser traversing distance is displayed on the abscissa of the curve data, the detection distance is displayed on the ordinate of the curve data, the detection distance is a distance value from the laser transmitting end to the corresponding lower end position of the soot rod, and whether sintering is normal or not is detected by comparing the values of the laser traversing distance and the detection distance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011279899.7A CN112194360B (en) | 2020-11-16 | 2020-11-16 | Device for monitoring abnormal sintering of optical fiber preform and monitoring method thereof |
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| CN202011279899.7A CN112194360B (en) | 2020-11-16 | 2020-11-16 | Device for monitoring abnormal sintering of optical fiber preform and monitoring method thereof |
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| CN112194360B true CN112194360B (en) | 2023-10-10 |
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| CN112979153B (en) * | 2021-02-26 | 2022-04-22 | 通鼎互联信息股份有限公司 | Structure is reformed transform to optical fiber perform sandwich layer sintering equipment laser support |
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| CN205590555U (en) * | 2016-05-06 | 2016-09-21 | 藤仓烽火光电材料科技有限公司 | Optical fiber perform's external diameter stabilising arrangement based on power switch |
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| CN213708139U (en) * | 2020-11-16 | 2021-07-16 | 江苏亨通光导新材料有限公司 | Device for monitoring whether sintering of optical fiber preform is abnormal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1279646B1 (en) * | 2001-07-26 | 2006-12-13 | Sumitomo Electric Industries, Ltd. | Method and apparatus for producing a glass preform for optical fibres |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105776838A (en) * | 2016-03-03 | 2016-07-20 | 江苏亨通光电股份有限公司 | Equipment and method for conducting PID controlled optical fiber prefabricated rod sintering with laser |
| CN205590555U (en) * | 2016-05-06 | 2016-09-21 | 藤仓烽火光电材料科技有限公司 | Optical fiber perform's external diameter stabilising arrangement based on power switch |
| CN110790501A (en) * | 2019-11-22 | 2020-02-14 | 青海中利光纤技术有限公司 | Sintering device and method for optical fiber preform |
| CN211141894U (en) * | 2019-11-22 | 2020-07-31 | 青海中利光纤技术有限公司 | Optical fiber perform's sintering device |
| CN213708139U (en) * | 2020-11-16 | 2021-07-16 | 江苏亨通光导新材料有限公司 | Device for monitoring whether sintering of optical fiber preform is abnormal |
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