CN104193182A - Accurate control method of etching technology in optical fiber preform production - Google Patents
Accurate control method of etching technology in optical fiber preform production Download PDFInfo
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- CN104193182A CN104193182A CN201410421792.XA CN201410421792A CN104193182A CN 104193182 A CN104193182 A CN 104193182A CN 201410421792 A CN201410421792 A CN 201410421792A CN 104193182 A CN104193182 A CN 104193182A
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Abstract
The invention provides an accurate control method of an etching technology in optical fiber preform production. According to the accurate control method, the etching time is determined by accurately controlling the concentration of acid in acid liquid and the temperature of the acid liquid, so that the etching thickness can be accurately controlled and the surface quality of a quartz rod and the quality stability of an optical fiber preform are ensured. In a state that the acid liquid for etching the quartz rod is kept circulated, the stability of the temperature of the acid liquid and the concentration of acid in the acid liquid is ensured by controlling the temperature of the acid liquid and the concentration of acid in the acid liquid, and then the etching thickness of the surface of the quartz rod is accurately controlled by adjusting the soaking time of the quartz rod in the acid liquid.
Description
Technical field
The present invention relates to the technical field that preform is made, be specially the accuracy control method of etching technique in a kind of preform production.
Background technology
The decay of the intensity of preform in drawing process and the optical fiber that draws is two important indicators of optical fiber production.The fracture that intensity difference causes, has increased the production cost of optical fiber greatly, and the defective optical fiber that directly causes of decaying is defective.These two indexs all have direct relation with the quartz pushrod surface imperfection of producing in optical fiber prefabricating rod motion, and surface imperfection principal mode is small crackle and small impurity.Produce the quartz pushrod (silica tube) such as mother's rod (plug), sleeve pipe in optical fiber prefabricating rod motion, all may occur aborning surperficial fine crack, crystallite and tiny flaw.
The method of removing fine crack, crystallite and the tiny flaw of producing the quartz pushrod surface in optical fiber prefabricating rod motion, nearly all adopts acid solution etching method.These quartz pushrods of etching, are equivalent to quartz surfaces evenly to get rid of one deck.Thereby can remove the fine crack on quartz pushrod surface, thereby reduce surface stress; Also can remove surperficial impurity.But the etching of transition, can cause producing new etched pitting; Cause that local indexes of refraction changes, and causes " miniature coarse "; Surface stress increases; Even cause cracking.Visible, controlling appropriate etched thickness (thickness etching away) is a very crucial technology.
At present, the research of the etching control technology in preform production process is little.Publication number is that CN1692086A and publication number are the patent of CN 101164937A, all the acid washing method of quartz pushrod is described, and has also spoken of the requirement of etched thickness, but specifically how accurately to control the temporary transient not deep research of etched thickness.
Etching quartz pushrod acid solution mainly contains hydrofluoric acid, the mixed a small amount of nitric acid of hydrofluoric acid, the mixed a small amount of sulfuric acid of hydrofluoric acid.Affect quartz pushrod etched thickness because have: the concentration of acid solution, the temperature of acid solution, etching period.Acid liquor temperature raises, and has improved reaction rate constant, and the rising of concentration has directly promoted speed of reaction, and the increase of pickling time has directly increased quartzy etched thickness.The method of the etched thickness of existing control quartz pushrod is constantly to adjust the etched time to adjust etched thickness, integral replacing acid solution after etching for some time.Within this method can only be controlled at dozens or even hundreds of micron etched thickness, etching control method is coarse, causes unstable product quality, and the disconnected fibre of wire drawing and optical fiber attenuation quality can not be controlled.
Summary of the invention
For the problems referred to above, the invention provides the accuracy control method of etching technique in a kind of preform production, it is by accurately controlling the concentration of each acid and the temperature of acid solution in acid solution, determine the etched time, thereby can accurately control etched thickness, guarantee the quality on quartz pushrod surface, guaranteed the steady quality of preform.
The accuracy control method of etching technique in a kind of preform production, it is characterized in that: the acid solution of etching quartz pushrod keeps under the state of circulation, by controlling the concentration of various acid in the temperature, acid solution of acid solution, guarantee concentration stable of various acid in the temperature, acid solution of acid solution, and then be immersed in time in acid solution and accurately control the etched thickness on quartz pushrod surface by adjusting quartz pushrod.
It is further characterized in that:
The acid solution of etching quartz pushrod keeps under the state of circulation, and the temperature of acid solution is monitored in timing, and when temperature is when setting low temperature, heating unit is heated in the temperature range of setting, thereby the temperature of controlling acid solution fluctuates in very little scope; The concentration of various acid in online acid assay instrument Timing measurement acid solution, in the time that the concentration of acid solution is less than setting low value, online acid assay instrument calculates needs the acid solution amount of discharging and the amount that needs the each high density acid solution increasing, thereby carry out automatic drain and acid adding, the concentration of acid solution is controlled in very little scope and is fluctuateed, in conjunction with the particular case on quartz pushrod surface, adjust etching period, adjust quartz pushrod rod and be immersed in the time in acid solution, thereby accurately control etched thickness.
It is further characterised in that:
Etching quartz pushrod is placed in etching bath, etching quartz pushrod is immersed in acid solution, outside acid solution storage tank is communicated with the acid solution import of etching bath, and the acid solution that exceeds setting liquid level of etching bath refluxes and enters acid solution storage tank, guarantees that the acid solution in etching bath keeps recurrent state;
Acid solution storage tank injects the acid solution import of etching bath, the self-circulation that acid solution storage tank injects acid solution by water pump acid solution tank inside, formation acid solution tank inside simultaneously by water pump by acid solution, guarantees that the acid solution in acid solution storage tank mixes;
The liquid level of the acid solution in acid solution storage tank is constant, ensures the cumulative volume of acid solution in acid solution storage tank, guarantees that the calculating of follow-up online acid assay instrument is accurate;
Heating unit is positioned at below the liquid level of acid solution storage tank, the outer setting of heating unit has controller, controller is communicated to the temperature control modules of total Electric Appliance Cabinet, the temperature measurement fraction of temperature measuring equipment is positioned at below the liquid level of acid solution storage tank, the temperature data of temperature measuring equipment is external to the temperature control modules of total Electric Appliance Cabinet, temperature control modules in total Electric Appliance Cabinet is compared according to the temperature of temperature measuring equipment feedback and the temperature of setting, when the temperature of temperature measuring equipment feedback is during lower than design temperature, temperature control modules starts heating unit and starts to heat the acid solution in acid solution storage tank, until temperature measuring equipment feeds back to the temperature of temperature control modules in the scope of design temperature, the heating work of temperature control modules heating-stopping apparatus,
The sampling part of online acid assay instrument is positioned at below the liquid level of acid solution storage tank, the regular draw samples of sampling part to online acid solution analyser is analyzed, and draw the concentration value of various acid in sample acid solution, in sample acid solution, the concentration value of the concentration value of various acid and the various acid of setting is compared, in the time that the concentration value of various acid in sample acid solution has at least one sour concentration to be less than setting low value, online acid assay instrument calculating needs the acid solution amount of discharge and the amount of each high density acid solution that corresponding needs increase, accurately control the output of acid solution storage tank, acid adding equipment adds the amount of each high density acid solution of acid solution storage tank, complete the concentration control for various acid in acid solution,
The discharge acid solution of the acid solution storage tank calculating by online acid assay instrument is discharged to outside spent acid treatment system, online acid assay instrument by the sample acid solution of having analyzed discharged to outside spent acid treatment system;
Method of the present invention is equally applicable to the quartz etch of other industry, guarantees the thickness controllable precision of quartz etch.
Adopt after the present invention, by controlling the temperature of acid solution, the concentration of various acid in acid solution, guarantee the temperature of acid solution, in acid solution, the concentration of various acid is stable, can keep etched speed of reaction is definite value, thereby by regulating etching period, be that quartz pushrod rod is immersed in the time in acid solution, reach desirable etched thickness, etched thickness can be controlled within 5 microns, owing to can accurately controlling the temperature of acid solution, the concentration of various acid in acid solution, need to enhance productivity, while reducing etching period, can set by the temperature-control range that regulates acid solution, or the scope of acid strength is set to realize, to sum up, adopt after present method, can accurately control the etched thickness of preform, guaranteed the quality on quartz pushrod surface, guarantee the steady quality of preform.
Brief description of the drawings
Fig. 1 is that the schematic block diagram of present method (only draws the trend of liquid management, do not draw the portion of electrical equipment control
Point);
In figure, the corresponding reference name of each sequence number is as follows:
Etching quartz pushrod 1, etching bath 2, acid solution storage tank 3, water pump 4, online acid assay instrument 5, heating unit 6, controller 7, temperature measuring equipment 8, acid adding equipment 9, spent acid treatment system 10.
Embodiment
The accuracy control method of etching technique in a kind of preform production, the acid solution of etching quartz pushrod keeps under the state of circulation, the temperature of acid solution is monitored in timing, when temperature is lower than setting when low temperature, heating unit starts to be heated in the temperature range of setting, thereby the temperature of control acid solution fluctuates in very little scope; The concentration of various acid in online acid assay instrument Timing measurement acid solution, in the time that the concentration of acid solution is less than setting low value, online acid assay instrument calculates needs the acid solution amount of discharging and the amount that needs the each high density acid solution increasing, thereby carry out automatic acid adding, the concentration of acid solution is controlled in very little scope and is fluctuateed, in conjunction with the particular case on quartz pushrod surface, adjust etching period, adjust quartz pushrod rod and be immersed in the time in acid solution, thereby accurately control etched thickness.
Embodiment, see Fig. 1: etching quartz pushrod 1 is placed in etching bath 2, etching quartz pushrod 1 is immersed in acid solution, outside acid solution storage tank 3 is communicated with the acid solution import of etching bath 2, the acid solution that exceeds setting liquid level of etching bath 2 refluxes and enters acid solution storage tank 3, guarantees that the acid solution in etching bath 2 keeps recurrent state;
The self-circulation that acid solution storage tank 3 is injected acid solution the acid solution import of etching bath 2, by described water pump 4, acid solution injected to acid solution storage tank 3 inside, formation acid solution storage tank 3 inside simultaneously by water pump 4, guarantees that the acid solution in acid solution storage tank 3 mixes;
The liquid level of the acid solution in acid solution storage tank 3 is constant, ensures the cumulative volume of acid solution storage tank 3 interior acid solutions, guarantees that the calculating of follow-up online acid assay instrument 5 is accurate;
Heating unit 6 is positioned at below the liquid level of acid solution storage tank 3, the outer setting of heating unit 6 has controller 7, it is (not shown in FIG. that controller 7 is communicated to the temperature control modules of total Electric Appliance Cabinet, belong to contral ripening technology), the temperature measurement fraction of temperature measuring equipment 8 is positioned at below the liquid level of acid solution storage tank 3, the temperature data of temperature measuring equipment 8 is external to total Electric Appliance Cabinet temperature control modules, temperature control modules in total Electric Appliance Cabinet is compared according to the temperature of temperature measuring equipment feedback and the temperature of setting, when the temperature of temperature measuring equipment feedback is during lower than design temperature, temperature control modules starts heating unit 6 and starts to heat the acid solution in acid solution storage tank 3, until temperature measuring equipment 8 feeds back to the temperature of temperature control modules in the scope of design temperature, the heating work of temperature control modules heating-stopping apparatus 6,
The sampling part of online acid assay instrument 5 is positioned at below the liquid level of acid solution storage tank, the regular draw samples of sampling part to online acid solution analyser 5 is analyzed, and draw the concentration value of various acid in sample acid solution, in sample acid solution, the concentration value of the concentration value of various acid and the various acid of setting is compared, in the time that the concentration value of various acid in sample acid solution has at least one sour concentration to be less than setting low value, online acid assay instrument 5 calculating need the acid solution amount of discharge and the amount of each high density acid solution that corresponding needs increase, accurately control the output of acid solution storage tank 3, acid adding equipment 9 adds the amount of each high density acid solution of acid solution storage tank 3, complete the concentration control for various acid in acid solution,
The acid adding amount of the output of acid solution storage tank 3 and acid adding equipment is all measured by volume pump, guarantees precision;
The discharge acid solution of acid solution storage tank is discharged to outside spent acid treatment system 10, online acid assay instrument 5 by the sample acid solution of having analyzed discharged to outside spent acid treatment system 10.
Wherein online acid assay instrument 5 is existing mature equipment, the Processlab At-Line series product that can select the logical Metrohm of Switzerland ten thousand to produce.
Specific embodiment: in the time adopting OVD explained hereafter preform, produce before preform, for the fine crack on quartz pushrod surface and Impurity removal are fallen, there is not crackle and cracking that over etching causes simultaneously, need to be etched gauge control in a very little scope, with ensure to produce preform drawing time intensity index and decay indices all arrive good effect.
When mixing a small amount of nitric acid quartz pushrod carried out to etching by hydrofluoric acid, the temperature of setting acid solution is 25 DEG C～28 DEG C, in acid solution, hydrofluoric acid concentration is 20%～23%, concentration of nitric acid is 8%～10%, the interior hydrofluoric acid that is placed with respectively high density of acid adding equipment 9, nitric acid, the hydrofluoric acid of the high density in acid adding equipment, nitric acid is placed in separately respectively in acid adding equipment 9, and by pipeline connection the hydrofluoric acid acid-adding port to acid solution storage tank 3, nitric acid acid-adding port, quartz pushrod is in acid cleaning process, the temperature of the acid solution in acid solution storage tank is monitored in temperature measuring equipment 8 timings, once monitor lower than 25 DEG C, starting heating unit 6 heats acid solution, the temperature of guaranteeing acid solution is 25 DEG C～28 DEG C, simultaneously online acid assay instrument 5 timing extraction sample acid solutions, the concentration of various acid in measure sample acid solution, when hydrofluoric acid concentration be less than 20% or and concentration of nitric acid while being less than 8%, online acid assay instrument 5 calculates to be needed the acid solution amount of the acid solution storage tank of discharging and needs the high concentration of hydrofluoric acid increasing, the amount of nitric acid, the amount of the output of accurate control acid solution storage tank, each high density acid solution that acid adding equipment adds acid solution storage tank 3, complete the concentration control for various acid in acid solution, guarantee in acid solution hydrofluoric acid concentration 20%～23%, concentration of nitric acid is 8%～10%.In acid cleaning process, can adjust the etched time, follow the tracks of wire drawing intensity and the decay indices of follow-up preform, in the time that these two indexs reach optimum value, fixing acid strength, acid liquor temperature, etching period, according to acid strength, acid liquor temperature, etching period under fixing, complete the volume production of producing this etch process on line, accurately control etched thickness, guarantee the quality on quartz pushrod surface, guaranteed the steady quality of preform.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. the accuracy control method of etching technique in a preform production, the acid solution of etching quartz pushrod keeps under the state of circulation, by controlling the concentration of various acid in the temperature, acid solution of acid solution, guarantee concentration stable of various acid in the temperature, acid solution of acid solution, and then be immersed in time in acid solution and accurately control the etched thickness on quartz pushrod surface by adjusting quartz pushrod.
2. the accuracy control method of etching technique in a kind of preform production as claimed in claim 1, it is characterized in that: the acid solution of etching quartz pushrod keeps under the state of circulation, the temperature of acid solution is monitored in timing, when temperature is lower than setting when low temperature, heating unit is heated in the temperature range of setting, thereby the temperature of control acid solution fluctuates in very little scope; The concentration of various acid in online acid assay instrument Timing measurement acid solution, in the time that the concentration of acid solution is less than setting low value, online acid assay instrument calculates needs the acid solution amount of discharging and the amount that needs the each high density acid solution increasing, thereby carry out automatic drain and acid adding, the concentration of acid solution is controlled in very little scope and is fluctuateed, in conjunction with the particular case on quartz pushrod surface, adjust etching period, adjust quartz pushrod rod and be immersed in the time in acid solution, thereby accurately control etched thickness.
3. the accuracy control method of etching technique in a kind of preform production as claimed in claim 2, it is characterized in that: etching quartz pushrod is placed in etching bath, etching quartz pushrod is immersed in acid solution, outside acid solution storage tank is communicated with the acid solution import of etching bath, the acid solution that exceeds setting liquid level of etching bath refluxes and enters acid solution storage tank, guarantees that the acid solution in etching bath keeps recurrent state.
4. the accuracy control method of etching technique in a kind of preform production as claimed in claim 2, it is characterized in that: acid solution storage tank injects the acid solution import of etching bath, the self-circulation that acid solution storage tank injects acid solution by water pump acid solution tank inside, formation acid solution tank inside simultaneously by water pump by acid solution, guarantees that the acid solution in acid solution storage tank mixes.
5. the accuracy control method of etching technique in a kind of preform production as claimed in claim 2, it is characterized in that: the liquid level of the acid solution in acid solution storage tank is constant, ensure the cumulative volume of acid solution in acid solution storage tank, guarantee that the calculating of follow-up online acid assay instrument is accurate.
6. the accuracy control method of etching technique in a kind of preform production as claimed in claim 2, it is characterized in that: heating unit is positioned at below the liquid level of acid solution storage tank, the outer setting of heating unit has controller, controller is communicated to the temperature control modules of total Electric Appliance Cabinet, the temperature measurement fraction of temperature measuring equipment is positioned at below the liquid level of acid solution storage tank, the temperature data of temperature measuring equipment is external to the temperature control modules of total Electric Appliance Cabinet, temperature control modules in total Electric Appliance Cabinet is compared according to the temperature of temperature measuring equipment feedback and the temperature of setting, when the temperature of temperature measuring equipment feedback is during lower than design temperature, temperature control modules starts heating unit and starts to heat the acid solution in acid solution storage tank, until temperature measuring equipment feeds back to the temperature of temperature control modules in the scope of design temperature, the heating work of temperature control modules heating-stopping apparatus.
7. the accuracy control method of etching technique in a kind of preform production as claimed in claim 2, it is characterized in that: the sampling part of online acid assay instrument is positioned at below the liquid level of acid solution storage tank, the regular draw samples of sampling part to online acid solution analyser is analyzed, and draw the concentration value of various acid in sample acid solution, in sample acid solution, the concentration value of the concentration value of various acid and the various acid of setting is compared, in the time that the concentration value of various acid in sample acid solution has at least one sour concentration to be less than setting low value, online acid assay instrument calculating needs the acid solution amount of discharge and the amount of each high density acid solution that corresponding needs increase, accurately control the output of acid solution storage tank, acid adding equipment adds the amount of each high density acid solution of acid solution storage tank, complete the concentration control for various acid in acid solution.
8. the accuracy control method of etching technique in a kind of preform production as claimed in claim 7, it is characterized in that: the discharge acid solution of described acid solution storage tank is discharged to outside spent acid treatment system, online acid assay instrument by the sample acid solution of having analyzed discharged to outside spent acid treatment system.
9. the accuracy control method of etching technique in a kind of preform production as described in arbitrary claim in claim 1 to 9, is characterized in that: it is applicable to the quartz etch of other industry, guarantees the thickness controllable precision of quartz etch.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277419A (en) * | 2015-11-18 | 2016-01-27 | 武威科近新发技术有限责任公司 | Circulating filtration type nuclear pore membrane etching device |
| CN115677207A (en) * | 2022-05-25 | 2023-02-03 | 中国科学院上海光学精密机械研究所 | Multilayer variable-diameter solid photonic crystal fiber oriented to adjustable dispersion and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101118333A (en) * | 2006-07-31 | 2008-02-06 | 卡西欧计算机株式会社 | Method of manufacturing a liquid crystal display apparatus |
| CN101140374A (en) * | 2006-09-08 | 2008-03-12 | 三星电子株式会社 | Etching liquid supply device, etching device and etching method |
| CN101443282A (en) * | 2006-05-17 | 2009-05-27 | 旭硝子株式会社 | Process for producing optical fiber |
-
2014
- 2014-08-25 CN CN201410421792.XA patent/CN104193182A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101443282A (en) * | 2006-05-17 | 2009-05-27 | 旭硝子株式会社 | Process for producing optical fiber |
| CN101118333A (en) * | 2006-07-31 | 2008-02-06 | 卡西欧计算机株式会社 | Method of manufacturing a liquid crystal display apparatus |
| CN101140374A (en) * | 2006-09-08 | 2008-03-12 | 三星电子株式会社 | Etching liquid supply device, etching device and etching method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277419A (en) * | 2015-11-18 | 2016-01-27 | 武威科近新发技术有限责任公司 | Circulating filtration type nuclear pore membrane etching device |
| CN105277419B (en) * | 2015-11-18 | 2018-01-23 | 武威科近新发技术有限责任公司 | The nucleopore membranes Etaching device of circular filtration type |
| CN115677207A (en) * | 2022-05-25 | 2023-02-03 | 中国科学院上海光学精密机械研究所 | Multilayer variable-diameter solid photonic crystal fiber oriented to adjustable dispersion and preparation method thereof |
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