CN104402212A - Optical fiber prefabricated component, sensing optical fiber, and preparation method of optical fiber prefabricated component - Google Patents
Optical fiber prefabricated component, sensing optical fiber, and preparation method of optical fiber prefabricated component Download PDFInfo
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- CN104402212A CN104402212A CN201410618701.1A CN201410618701A CN104402212A CN 104402212 A CN104402212 A CN 104402212A CN 201410618701 A CN201410618701 A CN 201410618701A CN 104402212 A CN104402212 A CN 104402212A
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Abstract
The invention relates to the technical field of optical fibers, and especially relates to an optical fiber prefabricated component, a hydro-generator stator iron core sensing optical fiber prepared by drawing the optical fiber prefabricated component, and a preparation method of the optical fiber prefabricated component. The materials of the core and coating of the optical fiber prefabricated component are improved. When the sensing optical fiber made of the optical fiber prefabricated component is bent or extruded, the optical loss efficiency is prominent. The materials of the coating layer and the sleeve layer of the sensing optical fiber are also improved to enhance the high temperature resistant property of the sensing optical fiber. Moreover, two parallelly-arranged optical fiber units are adopted to enable the sensing optical fiber to have multiply functions in the stator iron core state monitoring. The preparation method of the optical fiber prefabricated component is simple.
Description
Technical field
The present invention relates to technical field of optical fiber, particularly relate to a kind of fibre-optical preform, stretched by this fibre-optical preform the hydraulic generator stator core sensor fibre of preparation and the preparation method of this fibre-optical preform.
Background technology
Hydroelectric power plant's hydrogenerator is in operational process; Stator Slots siliconized plate ruptures, and under the effect of generator field pulling force, the siliconized plate of fracture cuts through the insulation layer of stator coil; generator stator ground, to be happened occasionally by the accident of forced-stopping machine, cause huge financial loss.For Timeliness coverage water turbine stator core fault, avoid hydraulic turbine operation accident to occur, research and development large-sized water turbine generator stator core displacement on-line monitoring system is necessary very much.
In recent years, the development of hydrogenerator operation parameters on-line monitoring technique rapidly, but, for the on-line monitoring of large-sized water turbine generator stator core, extensively adopt electromagnetic sensor as sensing member both at home and abroad at present, because electromagnetic sensor signal easily causes signal distortion by the interference of hydrogenerator high-intensity magnetic field and high electric field environment, thus cause the wrong report of on-line monitoring fault and and fail to report.
Optical fiber sensing technology is the novel science and technology grown up nearly decades, optical fiber has that working band is wide, dynamicrange is large, parameter loads the features such as easy, and thus optical fiber sensing technology effectively can be applied to parameter collection under multiple fields and environment and data transmission.The fundamental component of optical fiber is quartz, and fibre core external coating (EC) and protective layer material are high insulated non-metal material, and optical fiber only passes light; non-conductive; not by the effect of electromagnetic field, the optical signal of its transmission, not by the impact of electromagnetic field, has the characteristic of good electromagnetism interference, anti-man-made interference.Fibre Optical Sensor can adapt to hydrogenerator strong-electromagnetic field environment, can become the high performance sensor material of hydrogenerator.Optical fiber sensing technology is adopted can effectively to stop and evade generator high-intensity magnetic field, high electric field to the impact detecting parameter.
When light transmits in a fiber, due to fiber core specific refractory power (n
1) high, and fibre cladding specific refractory power (n
2) comparatively fiber core refractive index (n
1) low, i.e. n
2< n
1, fiber core is optically denser medium, and covering comparatively fibre core is optically thinner medium, and when light transmits in fibre core, total reflection occurs, without refraction loss, only scatter loss occurs, optical loss is very little.Covering and core material refringence are △=n
1-n
2, it directly affects the loss of light in Optical Fiber Transmission.When optical fiber by bending or extruding time, inside fibre-optical bending, clad material is squeezed, medium molecular density increases, cladding index increases, fibre core and bag index differential between layers △ reduce, along with the reduction of Refractive Index of Material difference between fiber core and covering, when cutoff wavelength is identical with operation wavelength, light in transmitting procedure because macrobend and micro-curved loss caused will increase.When fibre core and bag index differential between layers △ are less than ultimate value, light reflects in extruded parts, and optical loss increases sharply.By the research to fibre core and clad material, develop the total reflection feature that can have optical transport under normal circumstances, in micro-curved and macrobend situation, as sensor, stator lamination displacement signal loading can be significantly improved by the obvious optical fiber of optical loss benefit again, improve system senses ability.
To sum up, bending loss of optical fiber is by the impact of the factor such as fiber core and bag index differential between layers, numerical aperture, cutoff wavelength and operation wavelength, having the greatest impact especially by core bag refringence, therefore, in the fabrication process, the optical fiber of the application met in various field can be produced by adjustment fiber cores bag refringence.
Hydraulic generator stator and rotor clearance narrow and small, water turbine set vibration is large, diameter run-out is there is during rotor operation, insulated wire rod is had and notch is provided with groove Xie under in stator core slot, therefore, wanted to monitor the omnidirectional of the whole iron core of water turbine stator, sensor fibre need carry out displacement detection from multiple directions to each notch.Fibre Optical Sensor is little because of its external diameter, and at optical fiber outer cladding protective layer, makes optical fiber have certain tension, resistance to compression and resistant to bending physical property, can meet sensor fibre at stator core in-site installation and fixed demand.
For large-sized water turbine generator stator core displacement on-line monitoring system research project, the theoretical analysis and scientific experiment, by application optical fiber sensing technology, luminous power Real-Time Monitoring method is adopted to complete Large Hydroelectric Set stator core displacement on-line monitoring, this system senses layer adopts high bending susceptibility special optical fiber as the core sensor part of system, completes the collection to stator lamination displacement parameter.
Given this, the defect overcome existing for the prior art is the art problem demanding prompt solution.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of fibre-optical preform, to improve the optical loss benefit of optical fiber in bending situation.
The sensor fibre that the technical problem that the present invention will solve further is to provide a kind of stretching by above-mentioned fibre-optical preform and is formed, improves its high temperature resistant property, for the sensor fibre as hydraulic generator stator core.
The present invention adopts following technical scheme:
A kind of fibre-optical preform, be made up of silica based glasses, this fibre-optical preform comprises:
The core segment in the core region of optical fiber is formed as by stretching;
Be formed as the clad section of the cladding regions of described optical fiber by stretching, described clad section is positioned at the periphery of described core segment;
Wherein, described core is divided into undoped silica based glasses, and described clad section is the silica based glasses doped with boron and fluorine.
In some embodiments, described clad section is SiO
2-SiF
4-B
2o
3material.
In some embodiments, the SiO of described clad section
2-SiF
4-B
2o
3in material, the weight percent of fluorine is 1.5 ~ 2%, the weight percent of boron is 4.5 ~ 5%.
In some embodiments, the SiO of described clad section
2-SiF
4-B
2o
3in material, the weight percent of fluorine is 1.6 ~ 1.8%, the weight percent of boron is 4.6 ~ 4.8%.
Present invention also offers a kind of hydraulic generator stator core sensor fibre, it comprises two fiber units be set up in parallel, and is coated on the optical fiber tight sleeve layer that described fiber unit is outer, kept integratedly by two fiber units; Each fiber unit comprises the fibre core, covering and the coat that set gradually from inside to outside, the core segment of described fibre core and the covering fibre-optical preform respectively according to any one of Claims 1-4 and clad section carry out stretching and being formed, wherein, described coat and described optical fiber tight sleeve layer are polytetrafluoroethylmaterial material.
In some embodiments, the diameter of described sandwich layer is 5 ~ 10 μm, and the external diameter of described covering is 90 ~ 150 μm.
In some embodiments, the diameter of described sandwich layer is 9 μm, and the external diameter of described covering is 125 μm, and the external diameter of described coat is 250 μm.
Invention additionally provides a kind of preparation method of above-mentioned fibre-optical preform, comprise the steps: to use purity oxygen O
2as carrier gas, by the silicon tetrachloride SiCl mixed
4saturation steam and doping agent freonll-11 CF
2cl
2, boron bromide BBr
3import the inside of the quartzy armor hose be made up of silica based glasses, meanwhile, under rotation, heat outside described quartzy armor hose in the oxyhydrogen flame of 1400 ~ 1600 DEG C, to form SiO at described quartzy armor hose inwall
2-SiF
4-B
2o
3cladding glass layer; By the silicon tetrachloride SiCl of gasification
4saturation steam is at purity oxygen O
2as the inside importing quartzy armor hose under carrier gas, meanwhile, under rotation, in the oxyhydrogen flame of 1400 ~ 1600 DEG C, heat described quartzy armor hose, to form sandwich layer deposition; High temperature melting contracting is carried out again, to form fibre-optical preform in 1800 DEG C.
Compared with prior art, beneficial effect of the present invention is: the material of the present invention to core segment in fibre-optical preform and clad section improves, and the sensor fibre that this fibre-optical preform is formed is bending or when being squeezed, optical loss benefit is obvious; The material of the present invention to the coat of sensor fibre and optical fiber tight sleeve layer improves, and to improve its high temperature resistant property, and adopts two fiber units be set up in parallel, to meet the multi-functional in stator core condition monitoring; The preparation method of fibre-optical preform of the present invention is simple.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of sensor fibre that the embodiment of the present invention provides;
Fig. 2 is the tight mold structural representation that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
In the process of hydraulic generator stator core running status, sensor fibre is laid in the groove portion of stator core, when stator core abnormal state, sensor fibre bends or fractures, the state of monitoring sensor fibre can indirectly be monitored stator core state, be applicable in the process of the sensor fibre of above-mentioned observation process in research, the present inventor finds, by in the optical fiber that silica based glasses is formed, adopt undoped silica based glasses as core segment, be conducive to improving sensor fibre in the optical loss benefit bent or in the situation that is squeezed using the silica based glasses doped with boron and fluorine as clad section simultaneously.
The fibre-optical preform be made up of silica based glasses provided by the invention, comprising:
The core segment in the core region of optical fiber is formed as by stretching;
Be formed as the clad section of the cladding regions of described optical fiber by stretching, described clad section is positioned at the periphery of described core segment;
Wherein, described core is divided into undoped silica based glasses, and described clad section is the silica based glasses doped with boron and fluorine.
As a preferred version of the present invention, described clad section is SiO
2-SiF
4-B
2o
3material.Further, in order to improve the optical loss benefit of sensor fibre under bending, the SiO of described clad section
2-SiF
4-B
2o
3in material, the weight percent of fluorine is 1.5 ~ 2%, the weight percent of boron is 4.5 ~ 5%; Further, the SiO of described clad section
2-SiF
4-B
2o
3in material, the weight percent of fluorine is 1.6 ~ 1.8%, the weight percent of boron is 4.6 ~ 4.8% for best.
Fibre-optical preform can adopt vapour deposition process (MCVD) in pipe to make, and covering deposit host material is silicon tetrachloride (SiCl
4), low-refraction dopant material adopts freonll-11 (CF
2cl
2) and boron bromide (BBr
3), above-mentioned fibre-optical preform can be prepared in accordance with the following steps:
First, purity oxygen O is used
2as carrier gas, by the silicon tetrachloride SiCl mixed
4saturation steam and doping agent freonll-11 CF
2cl
2, boron bromide BBr
3import the inside of the quartzy armor hose be made up of silica based glasses, meanwhile, under rotation, heat outside described quartzy armor hose in the oxyhydrogen flame of 1400 ~ 1600 DEG C, to form SiO at described quartzy armor hose inwall
2-SiF
4-B
2o
3cladding glass layer.
Secondly, by the silicon tetrachloride SiCl of gasification
4saturation steam is at purity oxygen O
2as the inside importing quartzy armor hose under carrier gas, meanwhile, under rotation, in the oxyhydrogen flame of 1400 ~ 1600 DEG C, heat described quartzy armor hose, to form sandwich layer deposition.
Finally, then carry out high temperature melting contracting in 1800 DEG C, to form fibre-optical preform.
Refer to shown in Fig. 1, hydraulic generator stator core sensor fibre of the present invention, prepared by stretching by above-mentioned fibre-optical preform, comprise two fiber units be set up in parallel, each fiber unit comprises the fibre core 1 set gradually from inside to outside, covering 2 and coat 3, fibre core 1 and covering 2 are undertaken stretching by the core segment of fibre-optical preform and clad section and are formed respectively, in addition, sensor fibre of the present invention also has and is coated on outside fiber unit, the optical fiber tight sleeve layer 4 that two fiber units are kept integratedly, wherein, coat 3 and optical fiber tight sleeve layer 4 are polytetrafluoroethylmaterial material.Further, the diameter of described sandwich layer is 5 ~ 10 μm, and the external diameter of described covering is 90 ~ 150 μm.Further, the diameter of described sandwich layer is 9 μm, and the external diameter of described covering is 125 μm, and the external diameter of described coat is 250 μm.Optical fiber tight sleeve layer 4 adopts disc structure, and its external diameter is 1.2mm.Whole sensor fibre adopts twin-core structure, and two core centres, apart from 1.5mm, adopt the supporting shaping mould of special half extrusion mould to carry out optical fiber and tightly overlap coated.
Fig. 2 is the tight mold structural representation that the present invention adopts.Tight mold is arranged on screw injection molding machine outlet position, before tight sleeve layer cast is carried out to optical fiber, first by two the optical fiber passing hole of sensor fibre 9 through cast internal mold 8, and be fixed on winder, winding speed 1000m/mim, keep two fibre cores to keep tension force to remain on 180g ~ 220g simultaneously, when optical fiber tight sleeve layer shaping bad time adjustment winding speed, keep winding tension within the scope of 180g ~ 220g simultaneously.Polytetrafluoroethylene PTFE raw material is added injection moulding machine raw material cavity, be heated to 327-342 DEG C, polytetrafluoroethylene PTFE is in molten state, up-coiler starts, start to reel, open injection moulding machine discharge port valve, melting polytetrafluoroethylene PTFE 6 is clamp-oned in the cavity between external mold 7 and internal mold 8 under pressure simultaneously.Under optical fiber traction, the polytetrafluoroethylene PTFE material of melting is coated on optical fiber, enter in shaping mould 5 with optical fiber, mould sensor fibre carries out tentatively moulding, along with optical fiber continues winding, coated polytetrafluoroethylene PTFE tightly overlaps extrusion molding mould exit at optical fiber and is stretched further under the effect of optical fibre winding tension force, and sensor fibre tight sleeve layer is at air section cooling curing gradually simultaneously.Optical fiber tightly needs the physical dimension of on-line monitoring sensor fibre in cover process, adjustment optical fiber pulling speed is detected by physical dimension, ensure that optical fiber physical dimension is stablized, namely design load operating range is greater than when monitoring optical fiber physical dimension, then accelerate pulling speed, when physical dimension is less than design load allowed band, then slow down pulling speed.Pulling speed controls and physical dimension is detected as closed-loop control.
Because this sensor fibre needs tight sleeve layer and coat to have good fusion, need have when therefore sensor fibre manufactures and ensure enough air cooling times compared with the cold length of vast sky.For the additional stress produced in minimizing optical fiber tightly cover process, sensor fibre is by entering high-temperature water cooling after air cooling section, and in water-cooling groove, water temperature controls at 70 ~ 80 DEG C.Aging after shaping tight tube fiber one-tenth dish, when 50 ~ 60 DEG C aging 8 hours, naturally cool to normal temperature with ageing oven.
In sensor fibre of the present invention, the specific refractory power 1.4565 ~ 1.4567 of fibre core 1, the specific refractory power 1.4550 ~ 1.4552 of covering 2, i.e. the refringence n of fibre core 1 and covering 2
1-n
2=0.0013 ~ 0.0017.
According to result of study, sensor fibre is not when bending or bending curvature radius is greater than 15mm, when light is propagated in sensor fibre can there is full transmitting in optical fiber, optical transmission loss is less than 0.2dB/Km, but optical fiber is under affecting by external force, when fiber bending radius is less than 15mm, along with the reduction of fiber bending radius, bending loss of optical fiber increases sharply, be less than when 4mm light is propagated in sensor fibre total reflection can not occur in bending radius, optical transmission loss is not less than 5 dB/ crooked positions, and when fiber bending radius is less than 2mm, optical fiber easily ruptures.Optical fiber is made up of fibre core, covering, coat.Because optical fiber material is crisp, diameter is little, easily fractures, and finished product optical fiber need increase protective layer when applying, and adopts polytetrafluoroethylene (PTFE) as coating material, carries out primary coating to optical fiber, coating diameter 250 μm.The temperature of stator core in normal course of operation is approximately 80 DEG C, when stator core breaks down or generator is abnormal, stator temperature can rise local, therefore, require that sensor fibre should have the ability of anti-100 DEG C of high temperature, and sensor fibre can keep good physical property in stator operational process, comprises mechanical characteristics, profile nature etc.Sensor fibre is made up of fibre core, covering and coat, and polytetrafluoroethylene PTFE temperature profile is good, Applicable temperature scope is-190 ~ 250 DEG C, high-temperature aging resisting is functional, therefore, select F201 polytetrafluoroethylene (PTFE) as fibre coating material, be disposablely coated to fibre core external diameter 250 μm.Two optical fiber coatings adopt two kinds of distinct colors to paint, respectively blueing, tangerine two kinds of colors.Adopt twin-core structure form, and optical fiber is tightly overlapped using tetrafluoroethylene as tight sleeve layer material, tight cover material is identical with coating material to ensure the physical property that fibre core coat and tight sleeve layer are both identical, again because the temperature difference between optical fiber during tight cover and tight sleeve layer makes optical fiber to peel off smoothly.
Sensor fibre tight sleeve layer adopts high temperature resistance material polytetrafluoroethylene PTFE, and optical fiber is wound into dish after having painted, tightlier overlaps, and tight sleeve layer material also adopts polytetrafluoroethylene PTFE material.Optical fiber is tightly placed on conventional tight cover technical process basis increases aging technique, and eliminate the material stress of optical fiber in tight cover process, tightly cover flow process namely: fiber tension unwrapping wire → optical fiber preheating → optical fiber tightly overlaps → take-up → aging → inspection.Require that tight cover material and coating material have good fusion in tight cover technique, tight cover material require tensile strength and elongation at break low, such optical fiber is more easily out of shape when stator core extrudes and fractures, and sensing is obviously corresponding.
Optical fiber should adopt tension stringing in unwrapping wire process, and laying tension should control at 180g ~ 220g, and speed control is at 1000m/min.Optical fiber preheating is the critical process that optical fiber tightly overlaps, when optical fiber preheating, preheating temperature should control: 200 DEG C ± 2 DEG C, optical fiber answers preheating to complete before entering multiple screw extruder, and the tight cover material of optical fiber adopts polytetrafluoroethylene PTFE material, its molten solubility temperature is 327 DEG C ~ 342 DEG C, tight cover material is heated to 335 ± 5 DEG C, after polytetrafluoroethylene PTFE melting, adopts multiple screw extruder to be clamp-oned in mould, winding with optical fiber is extracted out, carries out continuously tight cover.
For ensureing that deformation and displacement can be all delivered to coat and fibre core by the fibre core tight sleeve layer when stator core is subjected to displacement effectively, do not produce small slip and displacement between each layer, sensing tight tube fiber and conventional tight tube fiber manufacturing process have larger difference.Tight sleeve layer and coat need have good fusion, and polymkeric substance flows out after head should carry out suitable air cooling, after carry out high-temperature water cooling again.Air cooling distance of the present invention is 300mm, and by lengthening air cooling distance, produce good fusion between tight sleeve layer and coat, adopt 60 DEG C of warm water water-cooleds, tight sleeve layer speed of cooling slows down simultaneously, and sensor fibre internal stress reduces, and optical fibre refractivity is more stable with decay.
Sensor fibre of the present invention adopts twin-core tight tube fiber, for adapting to the installation of optical fiber in stator core slot portion and teeth portion, meet small―gap suture and closely spaced installation between stator core slot portion and insulated wire rod between stators and rotators, sensor fibre cross section is approximate rectangular, be convenient to double-core parallel lay, reduce fibre core thickness, twin-core energy uniform stressed simultaneously, the tight mold of twin-core is special, ensures that sensor fibre tightly overlaps operation and can meet design requirement.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a fibre-optical preform, is made up of silica based glasses, it is characterized in that, this fibre-optical preform comprises:
The core segment in the core region of optical fiber is formed as by stretching;
Be formed as the clad section of the cladding regions of described optical fiber by stretching, described clad section is positioned at the periphery of described core segment;
Wherein, described core is divided into undoped silica based glasses, and described clad section is the silica based glasses doped with boron and fluorine.
2. fibre-optical preform according to claim 1, is characterized in that, described clad section is SiO
2-SiF
4-B
2o
3material.
3. hydraulic generator stator core sensor fibre according to claim 2, is characterized in that, the SiO of described clad section
2-SiF
4-B
2o
3in material, the weight percent of fluorine is 1.5 ~ 2%, the weight percent of boron is 4.5 ~ 5%.
4. hydraulic generator stator core sensor fibre according to claim 3, is characterized in that, the SiO of described clad section
2-SiF
4-B
2o
3in material, the weight percent of fluorine is 1.6 ~ 1.8%, the weight percent of boron is 4.6 ~ 4.8%.
5. a hydraulic generator stator core sensor fibre, is characterized in that, comprises two fiber units be set up in parallel, and is coated on the optical fiber tight sleeve layer that described fiber unit is outer, kept integratedly by two fiber units; Each fiber unit comprises the fibre core, covering and the coat that set gradually from inside to outside, the core segment of described fibre core and the covering fibre-optical preform respectively according to any one of Claims 1-4 and clad section carry out stretching and being formed, wherein, described coat and described optical fiber tight sleeve layer are polytetrafluoroethylmaterial material.
6. sensor fibre according to claim 5, is characterized in that, the diameter of described sandwich layer is 5 ~ 10 μm, and the external diameter of described covering is 90 ~ 150 μm.
7. sensor fibre according to claim 5, is characterized in that, the diameter of described sandwich layer is 9 μm, and the external diameter of described covering is 125 μm, and the external diameter of described coat is 250 μm.
8. the preparation method of fibre-optical preform according to claim 2, is characterized in that, comprises the steps: to use purity oxygen O
2as carrier gas, by the silicon tetrachloride SiCl mixed
4saturation steam and doping agent freonll-11 CF
2cl
2, boron bromide BBr
3import the inside of the quartzy armor hose be made up of silica based glasses, meanwhile, under rotation, heat outside described quartzy armor hose in the oxyhydrogen flame of 1400 ~ 1600 DEG C, to form SiO at described quartzy armor hose inwall
2-SiF
4-B
2o
3cladding glass layer; By the silicon tetrachloride SiCl of gasification
4saturation steam is at purity oxygen O
2as the inside importing quartzy armor hose under carrier gas, meanwhile, under rotation, in the oxyhydrogen flame of 1400 ~ 1600 DEG C, heat described quartzy armor hose, to form sandwich layer deposition; High temperature melting contracting is carried out again, to form fibre-optical preform in 1800 DEG C.
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|---|---|---|---|
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|---|---|---|---|
| CN201410618701.1A CN104402212B (en) | 2014-11-06 | 2014-11-06 | Optical fiber prefabricated component |
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| CN104402212B CN104402212B (en) | 2017-04-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108750873A (en) * | 2018-07-03 | 2018-11-06 | 杭州富通通信技术股份有限公司 | Preform lifting device |
| CN114184135A (en) * | 2016-02-25 | 2022-03-15 | 康奈尔大学 | Waveguide for use in a sensor or display |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184135A (en) * | 2016-02-25 | 2022-03-15 | 康奈尔大学 | Waveguide for use in a sensor or display |
| CN108750873A (en) * | 2018-07-03 | 2018-11-06 | 杭州富通通信技术股份有限公司 | Preform lifting device |
| CN108750873B (en) * | 2018-07-03 | 2023-07-25 | 杭州富通通信技术股份有限公司 | Optical fiber perform hoisting device |
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|---|---|
| CN104402212B (en) | 2017-04-19 |
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