Class / Patent application number | Description | Number of patent applications / Date published |
065377000 | With measuring, controlling, sensing, programming, timing, indicating, or testing | 84 |
20090314035 | METHOD FOR PRODUCING MINERAL WOOL - The invention relates to a method for producing mineral wool, wherein a mineral base material is melted in a cupola furnace having a shaft to hold the base material, the lower section of said shaft being provided with a grate, and beneath said grate there is a combustion chamber. The combustion chamber is heated by one or a plurality of burners, the burner or burners being run on liquid or gaseous fuel and an oxygen-containing gas. The burners are operated such that the length of the flames occurring during combustion of the fuel with the oxygen-containing gas is between 60% and 100% of the combustion chamber diameter. | 12-24-2009 |
20090320526 | Pre-Form For And Methods Of Forming A Hollow-Core Slotted PBG Optical Fiber For An Environmental Sensor - A preform for forming a hollow-core, slotted photonic band-gap (PBG) optical fiber for use in an environmental sensor, and methods of forming such a fiber using the preform are disclosed. The preform comprises a slotted cladding tube that surrounds a slotted, hollow-core PBG cane. The slots in the cladding tube and PBG cane are longitudinally formed and substantially aligned with each other. When the preform is drawn, the slots merge to form an elongated side opening or slot in the resulting hollow-core PBG fiber. In one case, the slot reaches the hollow core upon drawing, while in another case a second step is used to extend the slot to connect to the hollow core. The fiber is used to form an environmental sensor for sensing the presence of a target substance in an environment. The slot formed in the PBG region of the fiber forms a ridge waveguide wherein a portion of the light that otherwise is confined to the hollow core as a bound mode travels in the slot. The target substance affects the light traveling in the fiber, allowing for the target substance to be detected. | 12-31-2009 |
20100236292 | PROCESS FOR MANUFACTURING A LOW-ATTENUATION OPTICAL FIBER - A process for manufacturing an optical fiber, includes the steps of: a) producing a soot core preform by depositing a core material on a substrate; b) removing the substrate from the soot preform leaving an axial cavity along the longitudinal axis of the soot core preform; (c) drying and consolidating the soot core preform so as to obtain a glass core preform having an axial hole corresponding to the axial cavity; d) reducing a diameter of the axial hole; and e) stretching the glass core preform so as to substantially close the axial hole, wherein the process further includes the step of measuring at least one geometric characteristic of the axial hole of the glass core preform. | 09-23-2010 |
20110107797 | OPTICAL FIBER PREFORM MANUFACTURING METHOD AND OPTICAL FIBER PREFORM MANUFACTURING DEVICE - An optical fiber base material manufacturing method includes: supplying oxygen, hydrogen, and silicide to a core deposition burner; depositing silicon dioxide; adjusting a drawing up speed so that a deposition tip position remains at the same position in accordance with growth of a porous base material; calculating an average of the drawing up speed at each preset time interval; calculating a difference of the calculated average from a preset value of the drawing up speed; correcting a flow rate of silicon tetrachloride when the supplied hydrogen is hydrogen produced or stored at normal temperature, and correcting a flow rate of hydrogen when the supplied hydrogen is hydrogen obtained by vaporizing liquid hydrogen, where when correcting the flow rate of hydrogen, a flow rate of hydrogen supplied to a cladding deposition burner is also corrected in a ratio of before and after the correction of the flow rate of the hydrogen. | 05-12-2011 |
20110174019 | MANUFACTURING APPARATUS AND METHOD FOR OPTICAL WAVEGUIDE STRUCTURE - A manufacturing apparatus for an optical waveguide structure including a clad structure having grooves in a curved surface thereof and a clad film attached to the curved surface includes a clad film shape retaining portion that has a curved surface along which the clad film is held. a position checking portion that checks the position of the clad film on the clad film shape retaining portion, and a first position adjusting portion that adjusts the position of the clad film shape retaining portion so that the clad film on the clad film shape retaining portion is disposed at a reference position while checking the position of the clad film with the position checking portion. | 07-21-2011 |
20120073328 | METHOD AND SYSTEM FOR PROCESSING OPTICAL MATERIALS FOR HIGH POWER LASER SYSTEMS - A method of determining conditioning pulse parameters for an optical element includes directing a pump pulse to impinge on the optical element and directing a probe pulse to impinge on the optical element. The method also includes determining a first time associated with an onset of electronic excitation leading to formation of an absorbing region of the optical element and determining a second time associated with expansion of the absorbing region of the optical element. The method further includes defining a turn-off time for a conditioning pulse between the first time and the second time. According to embodiments of the present invention, pulse shaping of the conditioning pulse enables laser conditioning of optical elements to achieve improvements in their laser induced damage threshold. | 03-29-2012 |
20120144868 | APPARATUS AND METHOD FOR CONTROLLING MOISTURE IN THE MANUFACTURE OF GLASS FIBER INSULATION - Apparatus, systems and methods for monitoring and controlling the amount of moisture introduced into the forming hood area in the manufacture of mineral fiber insulation products. Moisture from coolant liquids, binder dispersions and binder diluents are all introduced deliberately into a forming hood; ambient moisture and water from combustion are additional sources. A series of global variable control valves, one for each fluid system; as well as individual variable control valves for each fiberizing unit are provided with associated meters. Sensors monitor fibrous pack conditions and ambient conditions and provide inputs to the valve control system. A specific 3-ring liquid dispensing system is also disclosed. | 06-14-2012 |
20120240636 | METHOD OF MANUFACTURING AN OPTICAL FIBRE, PREFORM AND OPTICAL FIBRE - A method for manufacturing an optical preform via an internal vapour deposition process, wherein during the inside deposition process the velocity of the reaction zone is set so that the velocity of the reaction zone over the length of the supply side-to-discharge side is higher than the velocity of the reaction zone over the length of the discharge side-to-supply side. | 09-27-2012 |
20120247156 | Method of producing biosoluble inorganic fiber - A method of producing inorganic fibers includes heating and melting an inorganic raw material that includes 70 wt % or more of silica and 10 wt % to 30 wt % of magnesia and calcia in total in a container to obtain a melt having a melt viscosity of 15 poise or less, supplying the melt to a rotor that rotates at an acceleration of 70 km/s | 10-04-2012 |
20130086952 | METHODS OF USING A SUBMERGED COMBUSTION MELTER TO PRODUCE GLASS PRODUCTS - A method comprises flowing an oxidant and a fuel into a submerged combustion burner in a glass tank furnace, the glass tank furnace receiving a feed of glass forming material and producing molten glass, the burner and furnace comprising a melting system. The melting system has a variable system vibration and/or oscillation due to the nature of submerged combustion. One method includes predicting a value of at least one property, such as viscosity, of the molten glass using the variable system vibration and/or oscillation. | 04-11-2013 |
20130133375 | METHOD FOR PRODUCING SYNTHETIC QUARTZ GLASS - A method for producing synthetic quartz glass comprises providing a liquid SiO | 05-30-2013 |
20130152637 | APPARATUS AND METHOD FOR CONTROLLING MOISTURE IN THE MANUFACTURE OF GLASS FIBER INSULATION - Apparatus, systems and methods for making a fibrous products form molten material into fibers. The fibers are sprayed with a coolant liquid to cool the fibers. A flow rate of the sprayed coolant liquid is controllable. The fibers are also sprayed with a binder dispersion. The fibers are directed toward a conveyor to form an uncured fibrous pack. A thickness of the uncured pack is measured and the flow rate of the sprayed coolant liquid is controlled based on the measured thickness of the uncured pack. | 06-20-2013 |
20130205834 | POROUS GLASS BASE MATERIAL SINTERING METHOD - It is an objective of the present invention to provide a method for sintering a porous glass base material that can experience an earthquake or large vibration without the base material falling or decreasing in quality when performing sintering, dehydration, and transparent vitrification on the porous glass base material. Provided is a method of sintering a porous glass base material including sintering by lowering the porous glass base material vertically through a furnace from above while rotating the porous glass base material, the method comprising changing rotational speed of the porous glass base material during the sintering. | 08-15-2013 |
20130291601 | GLASS BASE MATERIAL ELONGATING METHOD AND GLASS BASE MATERIAL ELONGATING APPARATUS - A glass base material elongating method of sequentially feeding rod-like glass base materials hung by a glass base material feeding mechanism into a heating furnace, and pulling a glass rod with a smaller diameter by a pulling chuck at a lower part of the heating furnace, includes: aligning, by an alignment guiding device that guides the glass rod, a guiding center of the alignment guiding device with an axis of the glass rod, the alignment guiding device guiding the glass rod between the heating furnace and the pulling chuck. | 11-07-2013 |
20130333421 | PROCESS FOR PRODUCING OPTICAL FIBER AND PROCESSING APPARATUS FOR OPTICAL FIBER WORK USED FOR THE SAME - Provided is a process for producing an optical fiber including a processing process where an optical fiber work made of a glass is held by a processing apparatus for an optical fiber work to be heated and processed, wherein in the processing process, vibration caused by an abnormality of the optical fiber work in the heated state or vibration caused by an abnormality of a glass body which is a portion of the processing apparatus for an optical fiber work and is in the state where the glass body portion is heated due to the heating of the optical fiber work is detected by using an acoustic emission sensor. | 12-19-2013 |
20140007623 | PROCESS OF USING A SUBMERGED COMBUSTION MELTER TO PRODUCE HOLLOW GLASS FIBER OR SOLID GLASS FIBER HAVING ENTRAINED BUBBLES, AND BURNERS AND SYSTEMS TO MAKE SUCH FIBERS - Processes and systems for producing glass fibers having regions devoid of glass using submerged combustion melters, including feeding a vitrifiable feed material into a feed inlet of a melting zone of a melter vessel, and heating the vitrifiable material with at least one burner directing combustion products of an oxidant and a first fuel into the melting zone under a level of the molten material in the zone. One or more of the burners is configured to impart heat and turbulence to the molten material, producing a turbulent molten material comprising a plurality of bubbles suspended in the molten material, the bubbles comprising at least some of the combustion products, and optionally other gas species introduced by the burners. The molten material and bubbles are drawn through a bushing fluidly connected to a forehearth to produce a glass fiber comprising a plurality of interior regions substantially devoid of glass. | 01-09-2014 |
20140020430 | GLASS BASE MATERIAL ELONGATION METHOD - Provided is a glass base material elongation method for elongating a glass base material with a large diameter to manufacture a glass rod with a smaller diameter, the method comprising, when elongating a glass base material that has a transparent glass tapered portion at one end of a trunk portion and a glass tapered portion including a non-transparent glass portion at the other end of the trunk portion, prior to the elongation, fusing a hanging dummy to an end of the transparent glass tapered portion, setting the hanging dummy in communication with a feeding mechanism, inserting the glass base material into a heating furnace beginning with the other end, and performing elongation. | 01-23-2014 |
20140283557 | QUARTZ GLASS MANUFACTURING METHOD USING HYDROGEN OBTAINED BY VAPORIZING LIQUID HYDROGEN - Provided is a quartz glass manufacturing method that involves using one or more burners, supplying hydrogen and oxygen to the one or more burners to generate an oxyhydrogen flame, introducing a silicide into the oxyhydrogen flame, forming a porous base material by depositing silicon dioxide generated from a flame hydrolysis reaction with the silicide, and heating and sintering the porous base material to form transparent glass, the method comprising supplying hydrogen that is stored or made at a normal temperature to the one or more burners; controlling a hydrogen flow rate using a measurement apparatus or control apparatus that performs measurement based on heat capacity of a gas; vaporizing liquid hydrogen stored in a low-temperature storage chamber, and supplying the vaporized liquid hydrogen to the one or more burners as backup hydrogen; switching from the hydrogen to the backup hydrogen; and when switching, adjusting the hydrogen flow rate to a value obtained by multiplying the hydrogen flow rate immediately after switching by a predetermined correction coefficient. | 09-25-2014 |
20150007615 | High Power Fiber Laser System with Side Pumping Arrangement - A twin fiber laser arrangement is configured with active and passive fibers supporting respective signal and pump lights and a reflective coating surrounding the fibers along a section of the arrangement. The passive fiber has regions covered by respective protective layer and coating-free regions alternating with the layer covered regions, wherein the reflective coating is configured to overlap the protective layer which shields the end of the reflective coating from high power pump light. | 01-08-2015 |
20150135775 | METHODS OF USING A SUBMERGED COMBUSTION MELTER TO PRODUCE GLASS PRODUCTS - A method comprises flowing an oxidant and a fuel into a submerged combustion burner in a glass tank furnace, the glass tank furnace receiving a feed of glass forming material and producing molten glass, the burner and furnace comprising a melting system. The melting system has a variable system vibration and/or oscillation due to the nature of submerged combustion. One method includes predicting a value of at least one property, such as viscosity, of the molten glass using the variable system vibration and/or oscillation. | 05-21-2015 |
20160185661 | Method of manufacturing optical fiber and apparatus of manufacturing the same - A method of manufacturing an optical fiber includes drawing an optical fiber preform and forming a bare optical fiber, disposing a coating layer formed of a resin on an outer circumference of the bare optical fiber, and curing the coating layer and obtaining an optical fiber. A direction of the bare optical fiber is changed by a direction changer in any position from drawing the optical fiber to disposing the coating layer, and the direction changer includes a guide groove which guides the bare optical fiber, | 06-30-2016 |
065378000 | Optical property | 22 |
20080236203 | METHOD FOR TREATING OPTICAL FIBER - Included are monitoring a loss value of the optical fiber with respect to propagation light having a wavelength at or in the vicinity of 1714 nm after the optical fiber is exposed to deuterium; and ending the exposure of the optical fiber to the deuterium when a change quantity of the loss value has exceeded a predetermined value. The monitoring of the loss value is pursued by, while exposing the optical fiber to an atmosphere that contains deuterium, causing propagation light having a wavelength at or in the vicinity of 1714 nm to be incident from one end of the optical fiber, monitoring the propagation light emitted from the other end of the optical fiber, and measuring a loss value of the optical fiber. According to this, it is possible to manufacture an optical fiber having an excellent hydrogen resistance characteristic assuredly and at low cost. | 10-02-2008 |
20100294000 | Process for manufacturing an optical fiber with a time-stable hydroxyl content - The hydroxyl content in an optical fiber is stabilized by a manufacturing process involving exposure of the optical fiber to a mixture of deuterium and a predetermined amount of hydrogen. | 11-25-2010 |
20110088433 | Methods For Drawing Multimode Bend Resistant Optical Fiber - According to one embodiment, a method for characterizing a multimode, bend resistant optical fiber may include determining a core refractive index profile for a core portion of a preform and determining a moat refractive index profile for a moat portion of the preform. Thereafter, a property of a multimode optical fiber is determined prior to drawing the multimode optical fiber from the preform. The property of the multimode fiber is determined based on the core refractive index profile of the preform, the moat refractive index profile of the preform, the inner radius r | 04-21-2011 |
20110094268 | METHOD FOR PRODUCING HIGH STRENGTH AND LONG COILING LENGTH SINGLE-MODE FIBER FOR SUBMARINE CABLE - A method for producing a single-mode fiber for submarine cables including washing and flame polishing of a preform, fiber drawing, coating with a first coating layer and curing therein using an UV-curing device, coating with a second coating layer and curing therein using the UV-curing device, fiber selection with a 2% screening strain, and testing the properties of the fiber. The fiber has a high strength and long coiling length exceeding 100 km and the method is easy to practice with low production cost and parameters involved therein are highly controllable. | 04-28-2011 |
20110132037 | HOLE DIAMETER MEASURING METHOD AND DEVICE FOR HOLEY OPTICAL FIBER, AND MANUFACTURING METHOD AND DEVICE FOR HOLEY OPTICAL FIBER - A hole diameter measuring method for a holey optical fiber of the present invention is a hole diameter measuring method for a holey optical fiber having: continuously irradiating a side of a holey optical fiber bare wire with parallel light rays, the holey optical fiber bare wire obtained by drawing an optical fiber base material; continuously detecting, with a detecting portion, forward scattering light that is generated by the irradiation of the holey optical fiber bare wire with the parallel light rays; and calculating a diameter of at least one hole in the holey optical fiber bare wire using a correlation relationship between a scattering intensity pattern of the detected forward scattering light and the diameter of the at least one hole. | 06-09-2011 |
20110265520 | Methods For Determining The Rotational Characteristics Of An Optical Fiber - A method for determining a rotational characteristic of an optical fiber is disclosed. The method includes forming an orientation registration feature in an optical fiber preform and drawing an optical fiber from the preform such that the orientation registration feature formed in the optical fiber preform is imparted to the optical fiber. The optical fiber is then rotated about a longitudinal axis and the direction of rotation is periodically reversed. An orientation signal of the optical fiber is determined based on a position of the orientation registration feature as the optical fiber is rotated. A rotational characteristic of the optical fiber is then determined based on the orientation signal. | 11-03-2011 |
20120042696 | MEASURING METHOD OF LONGITUDINAL DISTRIBUTION OF BENDING LOSS OF OPTICAL FIBER, MEASURING METHOD OF LONGITUDINAL DISTRIBUTION OF ACTUAL BENDING LOSS VALUE OF OPTICAL FIBER, TEST METHOD OF OPTICAL LINE, MANUFACTURING METHOD OF OPTICAL FIBER CABLE, MANUFACTURING METHOD OF OPTICAL FIBER CORD, AND MANUFACTURING METHOD OF OPTICAL FIBER - A measuring method of a longitudinal distribution of bending loss of an optical fiber includes calculating an arithmetical mean value I(x) from two backscattering light intensities of two backscattering light at a position x obtained by bidirectional OTDR measurement of the optical fiber; and obtaining a bending loss value at the position x from a mode field diameter 2W(x) and a relative refractive index difference Δ(x) at the position x calculated from the arithmetical mean value. | 02-23-2012 |
20120073329 | LARGE DIAMETER OPTICAL WAVEGUIDE SPLICE - Techniques and systems suitable for performing low-loss fusion splicing of optical waveguide sections are provided. According to some embodiments, multiple laser beams (from one or more laser) may be utilized to uniformly heat a splice region including portions of the optical waveguide sections to be spliced, which may have different cross-sectional dimensions. According to some embodiments, the relative distance of the optical waveguide sections and/or the power of the multiple laser beams may be varied during splicing operations. | 03-29-2012 |
20120118018 | OPTICAL FIBER PREFORM, METHOD OF MANUFACTURING OPTICAL FIBER PREFORM, AND METHOD OF MANUFACTURING OPTICAL FIBER - A porous layer is formed by depositing a silica glass particle around a core rod. The porous layer is dehydrated. The dehydrated porous layer is sintered under a decreased pressure until the dehydrated porous layer becomes a translucent glass layer containing a closed pore. The translucent glass layer is vitrified under an ambient atmosphere including an inert gas other than a helium gas. | 05-17-2012 |
20120125053 | METHOD OF MANUFACTURING OPTICAL FIBER WITH SELECTED DRAW TENSION - A method of manufacturing an optical fiber includes providing a preform in a furnace, and drawing a plurality of optical fibers from the preform at a plurality of different draw tensions. A bandwidth characteristic of each of the optical fiber is drawn at the different draw tensions is measured. A draw tension setpoint is selected based on the measured bandwidth characteristic of each optical fiber and the draw tension is adjusted to the selected draw tension setpoint. The method further includes drawing from the preform a tuned optical fiber at the selected draw tension setpoint which provides peak bandwidth. | 05-24-2012 |
20130205835 | OPTICAL ELEMENT CLEAVER AND SPLICER APPARATUS AND METHODS - Apparatus and methods are described herein for cleaving an optical element at a defined distance from a splice (or other reference point/feature) of the optical element within a desired precision and/or accuracy. In some embodiments, a method includes receiving an indication of a location of a feature in an intermediate optical assembly visible within an image of the intermediate optical assembly. The feature can be for example, a splice. A position of the intermediate optical assembly is translated relative to a cleave unit based on the indication. After translating, the intermediate optical assembly, the intermediate optical assembly is cleaved to form an optical assembly that has an end face at a location disposed at a non-zero distance from the location of the feature. In some embodiments, the location of the feature can be determined with an image recognition system. | 08-15-2013 |
20130219969 | METHODS OF MAKING A STUB LENS ELEMENT AND ASSEMBLIES USING SAME FOR OPTICAL COHERENCE TOMOGRAPHY APPLICATIONS - Methods of making a stub lens element and assemblies for coherence tomography (OCT) applications are disclosed. The method of making the stub lens element includes drawing a rod of optical material and processing the drawn rod to form a lens integrally connected to a stub section. The methods also include operably supporting an optical fiber and a stub lens element in a cooperative optical relationship to form a stub lens sub-assembly. The methods also include operably supporting the stub lens sub-assembly and a light-deflecting member in a cooperative optical relationship to form a probe optical assembly that has a folded optical path. | 08-29-2013 |
20130298610 | FUSION SPLICING APPARATUS AND FUSION SPLICING METHOD - A fusion splicing apparatus fusion-splices end faces | 11-14-2013 |
20140020431 | Methods for Making a Graded-Index Multimode Preform and Fiber - Methods for making a preform for a graded-index multimode fiber by using an inside deposition process are disclosed. The methods are characterized by an iterative refractive index profile correction with the following steps: determining a target refractive index profile for the preform to be produced, carrying out an inside deposition process with fixed volume flows for the reacting gases inside a tube and a given burner speed for all deposited layers, collapsing the tube and measuring the actual refractive index profile, comparing the target profile with the actual profile and calculating a correction value of index differences, converting this correction value in corrected burner speeds as varying process parameter, carrying out a inside deposition process with fixed gas flows and corrected burner speeds for all layers to be deposited. | 01-23-2014 |
20140090425 | Laser Machining and Mechanical Control of Optical Microresonators - An apparatus and technique are used to fabricate optical microresonators. A fabrication chamber contains all fabrication materials and devices. The microresonators are fabricated from a glass preform mounted on a motorized spindle. A laser is focused onto the preform to partly or fully impinge on the preform. The laser's focus position is controlled by changing the positioning of a lens mounted on a translation stage. Piezoelectric control elements may be mounted to finished microresonators to control of nonlinear parametric oscillation and four-wave mixing effects of the microresonator, control of nonlinear optical stimulated Brillouin scattering and Raman effects of said microresonator and wideband tuning of the frequency spacing between the output modes of a nonlinear-Kerr-effect optical frequency comb generated with said microresonator. | 04-03-2014 |
20140318188 | METHODS FOR MODIFYING MULTI-MODE OPTICAL FIBER MANUFACTURING PROCESSES - Methods for modifying multi-mode optical fiber manufacturing processes are disclosed. In one embodiment, a method for modifying a process for manufacturing multi-mode optical fiber includes measuring at least one characteristic of a multi-mode optical fiber. The at least one characteristic is a modal bandwidth or a differential mode delay at one or more wavelengths. The method further includes determining a measured peak wavelength of the multi-mode optical fiber based on the measured characteristic, determining a difference between the target peak wavelength and the measured peak wavelength, and modifying the process for manufacturing multi-mode optical fiber based on the difference between the target peak wavelength and the measured peak wavelength. | 10-30-2014 |
20150336837 | APPARATUS AND METHOD FOR CARRYING OUT A PLASMA DEPOSITION PROCESS - A method for carrying out a plasma deposition process including the steps of providing a substrate tube, supplying dopant-containing glass-forming gases to the substrate including a main gas flow and one or more secondary gas flows, inducing a plasma in the substrate tube, moving a reaction zone back and forth in strokes between a reversal point near the supply side and a reversal point near the discharge side, and interrupting the secondary gas flow during a portion of each stroke, each interruption having a start point and an end point within the same stroke. | 11-26-2015 |
20150355416 | METHODS AND SYSTEMS FOR POLISHING OPTICAL FIBERS - A method of polishing an optical fiber that extends through a ferrule involves: (a) determining a polishing depth by measuring the distance between an end of the optical fiber and an end face of the ferrule with an interferometer; (b) performing a polishing step based on the the polishing depth to remove material from the end of the optical fiber; and (c) repeating steps (a) and (b) until the end of the optical fiber is within a predetermined distance of the end face of the ferrule. Related systems for polishing an optical fiber that extends through a ferrule are also disclosed. | 12-10-2015 |
20150378102 | FEEDBACK SYSTEM FOR IMPROVING THE STABILITY OF A CO2 LASER BASED SPLICING AND TAPERING APPARATUS - An apparatus for splicing and tapering optical fibers employing a feedback system for stabilizing the laser output is disclosed. The apparatus may include a laser illuminating a target-area of one or more optical fibers by a laser beam; one or more cameras receiving light from one or more areas of the fibers and forming images of the one or more areas; a beam sampler detector sampling the beam power; and a controller receiving images from the camera and a signal from the power sampler. The controller may use the images received from the camera and the signal received from the detector as feedback parameters and to control the laser output according to said signal and said images such as to stabilize the laser output. The controller may include an image analysis unit determining, based on the images, a brightness or temperature distribution over the areas of the fibers. | 12-31-2015 |
20160002105 | METHOD OF PROCESSING OPTICAL FIBER AND METHOD OF ESTIMATING THEREFOR - A method of processing an optical fiber of the invention includes: a determination step of determining at least an ambient temperature of conditions of a diffusion treatment that causing an optical fiber to be subjected to an non-oxygen bridging atmosphere; an exposure step of exposing the optical fiber to a gas including an oxygen bridging element that is capable of processing the Non-Bridging Oxygen Hole Centers by being bonded to a non-bridging oxygen in the optical fiber, and causing the oxygen bridging element to infiltrate into the optical fiber; and a diffusion step of subsequently causing the optical fiber to be subjected to the non-oxygen bridging atmosphere in the exposure ambient temperature which is determined by the determination step and at which the optical fiber is subjected to the non-oxygen bridging atmosphere, and thereby diffusing the oxygen bridging element into the optical fiber. | 01-07-2016 |
20160139062 | METHOD FOR DETECTING DEFECTS IN A ROD-SHAPED TRANSPARENT OBJECT - A method for inspecting defects inside a rod-shaped transparent object by using a scanning beam of parallel light rays directed onto a rod-shaped transparent object orthogonally to the longitudinal axis of the object so that an inspection plane comprises an object's cross-section. The scanning beam is detected at an opposite side of the rod-shaped object that is interposed to intercept the parallel rays of the scanning beam. The electric output signal from the detector is processed to produce a first light intensity profile in a first scan direction, the light intensity profile comprising a shadow region delimited by first and second shadow edges, which is indicative of the outside diameter of the object across the inspection plane. The method comprises analysing the first light intensity profile to determine the presence or absence of a peak of positive intensity within the shadow region and, if an intensity peak is determined to be present, to determine the presence or absence of a region of depressed intensity within the intensity peak. If, as a result of analysing, an intensity peak within the shadow region is determined to be absent or a region of depressed intensity is determined to be present within the intensity peak, the presence of at least one structural defect within the object's cross-section is identified. In the preferred embodiments, the rod-shaped transparent object is a glass core rod for the production of a transmission optical fibre. | 05-19-2016 |
20160161673 | ALIGNMENT DEVICE, SPLICING DEVICE, ALIGNING METHOD, AND SPLICING METHOD FOR OPTICAL FIBERS - An optical fiber alignment device includes an image-capturing device capturing images of end surfaces of two optical fibers; an image-analyzing device obtaining position coordinates of two or more cores in the end surfaces from the image captured by the image-capturing device for each of the two optical fibers; a calculation device substituting the position coordinates of the cores obtained for each of the optical fibers in a theoretical equation that represents a total sum of axial deviation losses at the time of splicing the cores to each other, the calculation device obtaining a positional relationship between the end surfaces of the optical fibers from the theoretical equation such that the total sum of the axial deviation losses becomes a minimum; and a driving device arranging the optical fibers such that the end surfaces of the optical fibers satisfy the positional relationship obtained by the calculation device. | 06-09-2016 |
065379000 | Fluid pressure | 12 |
20090217710 | Methods for measuring the tension of optical fibers during manufacture - A non-contact method for measuring the tension applied to a drawn optical fiber includes drawing an optical fiber and displacing the optical fiber by applying a pressurized fluid to the optical fiber. The pressurized fluid may be applied to the optical fiber using a fluid bearing. The fluid bearing may include a fiber support channel. The optical fiber may be directed through the fiber support channel and is displaced relative to the fluid bearing by supplying the pressurized fluid to the fiber support channel. The displacement of the optical fiber caused by the application of the pressurized fluid to the optical fiber may then be measured. The tension applied to the optical fiber may then be determined based on the determined displacement. | 09-03-2009 |
20100180639 | Method and System For Manufacturing an Optical Fiber Preform - A method is described for manufacturing an optical fiber preform, including a tube collapsing phase, and including monitoring the concentration of at least one fluid component of a fluid that is exhausted from the tube, to detect structural integrity of the tube. A system is also described for manufacturing optical fiber preforms. The system comprising a holder configured to hold a tube, a heater configured to heat at least part of the tube to a tube collapsing temperature, a fluid exhaust configured to discharge fluid from the tube, held by the holder. The system also includes a tube integrity monitor configured to monitor structural integrity of the tube, during a collapsing phase, by monitoring fluid that is discharged from the tube. | 07-22-2010 |
20100180640 | Method And System For Manufacturing An Optical Fiber Preform - A method for manufacturing an optical fiber preform is described that includes detecting structural integrity of the tube during a collapsing phase utilizing a fluid flow that is fed to the tube. Also, a system for manufacturing optical fiber preforms is described that comprises a holder configured to hold a tube, a heater configured to heat at least part of the tube to a tube collapsing temperature, and a fluid supply system configured to supply a fluid to the tube held by the holder. The system comprises a tube integrity monitor configured to monitor structural integrity of the tube, during a collapsing phase, by monitoring the fluid. | 07-22-2010 |
20120167633 | Glass-Melting Device for Producing Glass Fiber and Method for Producing Glass Fiber - A glass-melting device for producing glass fibers capable effectively reducing inclusion of bubbles into glass fibers to be spun, and a method for producing glass fibers using the same are provided. | 07-05-2012 |
20120279258 | METHOD OF DEHYDRATING AND SINTERING POROUS PREFORM FOR OPTICAL FIBER AND DEHYDRATION-SINTERING FURNACE - A dehydration-sintering furnace includes a muffle tube that accommodates therein the porous preform, a heater that heats the porous preform from outside of the muffle tube, a furnace body that accommodates the heater at an outer periphery of the muffle tube. When a gas required for dehydrating and sintering the porous preform is supplied in the muffle tube, and a pressure in the muffle tube is measured, an average value of the pressure in the muffle tube P0 and a standard deviation of the pressure in the muffle tube σ0 are controlled to satisfy a relation P0−3×σ0>0. | 11-08-2012 |
20130167593 | PCVD Method and Apparatus - The disclosed Plasma Chemical Vapor Deposition (PCVD) process uses the injection of plasma-reactive gas to control deposition oscillation and refractive-index oscillation (e.g., alpha oscillation). This PCVD process, which may employ a modified PCVD apparatus, achieves more uniform glass deposition. This, in turn, results in optical preforms and optical fibers having more uniform optical properties. | 07-04-2013 |
20130298611 | METHOD OF MANUFACTURING OPTICAL FIBER BASE MATERIAL AND APPARATUS OF THE SAME - A method of manufacturing an optical fiber base material includes: forming a porous glass base material by depositing glass particles; providing a synthetic quartz glass vessel at least partly made of quartz glass which contains aluminum equal to or less than 0.01 ppm; introducing dehydration reaction gas and inert gas into the vessel; heating a portion made of quartz glass which contains aluminum equal to or less than 0.01 ppm in the vessel that contains the dehydration reaction gas and the inert gas; and inserting the porous glass base material into the heated vessel to dehydrate and sinter the porous glass base material. | 11-14-2013 |
20130340483 | GRAPHITE HEATING FURNACE - A gas supplying unit supplies a nitrogen gas into a furnace body of a graphite heating furnace in which at least a part of the furnace body is formed with a graphite. An exhausting unit exhausts a gas inside the furnace body to outside the furnace body. A dew-point temperature of the nitrogen gas supplied into the furnace body is equal to or lower than −80° C. A pressure inside the furnace body is equal to or higher than 140 Pa with respect to an atmospheric pressure outside the furnace body. | 12-26-2013 |
20140075998 | POROUS GLASS PREFORM PRODUCTION APPARATUS - A porous preform production apparatus having a reaction vessel which includes an upper deposition chamber having an air supply inlet and an exhaust outlet, a lower deposition chamber having an air supply inlet, and a top chamber disposed on top of the upper deposition chamber and adapted to lift and store a porous preform formed by deposition, characterized in that the floor of the upper deposition chamber is disposed at a height between the lower end of a straight body part and the deposition tip of the porous glass preform during deposition, and a connection opening which connects the upper deposition chamber with the lower deposition chamber, is provided on the floor of the upper deposition chamber, and that when the aperture diameter of the connection opening is designated as A and the diameter of the porous preform passing through the connection opening as B, the ratio B/A satisfies the expression 0.05≦B/A≦0.6. | 03-20-2014 |
20140202214 | METHOD AND APPARATUS FOR OPTICAL FIBER COLORING - A method of coloring optical fibers during the optical fiber drawing that includes the steps of feeding a natural fiber coating material and a colorant to a mixer; mixing the natural fiber coating material and the colorant in the mixer to obtain a colored coating material; and supplying the colored coating material to a coating die. The feeding step includes exerting on the natural fiber coating a first gas pressure variable with at least one fiber drawing parameter; and exerting on the colorant a second gas pressure variable with at least one fiber drawing parameter. | 07-24-2014 |
20140305168 | METHOD FOR MANUFACTURING GLASS-FINE-PARTICLE-DEPOSITED BODY AND METHOD FOR MANUFACTURING GLASS BASE MATERIAL - In the method for manufacturing a glass-fine-particle-deposited body according to the present invention, at least a part of a gas supplying pipe | 10-16-2014 |
20150336841 | METHOD FOR MANUFACTURING AN OPTICAL PREFORM - A method for manufacturing an optical preform including the steps of providing a substrate tube having deposited layers of glass on an inside surface thereof, increasing an outer diameter of the substrate tube by means of applying a traversing heat source to heat the substrate tube to above a softening temperature thereof and by providing an internal pressure in the substrate tube higher than an ambient pressure, and collapsing the substrate tube of increased outer diameter by means of applying the traversing heat source to heat the substrate tube to above the softening temperature thereof such that an optical preform is manufactured. | 11-26-2015 |
065380000 | Molten material level | 1 |
20090277227 | GLASS MELTING IN THE PRESENCE OF SULPHUR - The invention relates to a process for manufacturing a glass by melting, at more than 1300° C., batch materials comprising silica and an alkali or alkaline-earth metal sulfate, characterized in that a sulfide is added to the batch materials in order to reduce the height of foam at the surface of the bath of liquid glass at more than 1300° C. The invention reduces the formation of foam at the surface of the glass and improves the heat exchanges between the overhead burners and the glass bath. The invention is particularly suitable for glass intended to be fiberized. | 11-12-2009 |
065381000 | Winder or puller movement | 10 |
20090320527 | APPARATUS AND METHOD FOR TAPERING OPTICAL FIBERS TO CONFORM TO A DESIRED RADIAL PROFILE - An apparatus and method for tapering an optical fiber segment having an initial radial profile to substantially conform to a pre-specifiable desired radial profile for controlling mutually coordinated elongation and softening of different axial portions of the segment according to control parameters derivable based on a normalized axial coordinate reference by which points of the initial profile map to corresponding points of the desired profile. The softening and/or elongation may progress substantially in either a step-wise, time-discrete manner or time-continuously. The invention is useful for forming tapered fused couplers as well as for tapering individual fibers. | 12-31-2009 |
20110174020 | OPTICAL FIBER MANUFACTURING METHOD - A method of manufacturing an optical fiber which comprises heating and melting one end of an optical fiber preform made of a glass, drawing a glass optical fiber from the one end, measuring a total volume of the drawn glass optical fiber, and carrying out a control of changing a drawing speed of the glass optical fiber on the basis of the measured total volume. | 07-21-2011 |
20110239709 | MANUFACTURING METHOD OF OPTICAL FIBER - In an optical fiber manufacturing method, the cooling device and the coating device are connected in an airtight manner and by preventing a cooling gas, flowing inside the cooling device, from flowing into the coating device by a meniscus of resin inside of the coating device, a flow of the cooling gas inside the cooling device is discharged to an outside of an upper end of the cooling device as an upward stream; helium gas as the cooling gas flows into a lower portion of the cooling device and carbon dioxide gas as the cooling gas which is separated from the helium gas flows into a side lower than a position where the helium gas flows in, during the forcible cooling; and a flow rate of the helium gas and a flow rate of the carbon dioxide gas are individually controlled. | 10-06-2011 |
20120055198 | APPARATUS FOR FABRICATING A GLASS ROD AND METHOD OF SAME - The present invention provides a apparatus and a method for fabricating a glass rod capable of suppressing a diameter fluctuation of a drawn glass rod even in case of a relatively large diameter reduction ratio between a glass preform and a glass rod, such as 60 to 95%. A feed speed V | 03-08-2012 |
20130118207 | APPARATUS FOR AND METHOD OF PROCESSING GLASS OPTICAL FIBER, METHOD OF MANUFACTURING AND METHOD OF DRAWING OPTICAL FIBER - A method of processing an optical fiber includes introducing fiber that has passed a pulling mechanism to a shredding unit with an introducing unit. The introducing unit includes a movable unit including a notch configured to fit with a capstan roller included in the pulling mechanism, a sliding mechanism that attaches the movable unit slidably with respect to a main body of the introducing unit, and a restoring mechanism configured to restore the movable unit to an initial position when the movable unit has slid. The method includes shredding the fiber introduced by the introducing unit into fiber pieces, and suctioning, carrying, and collecting the fiber pieces. A method of drawing an optical fiber includes drawing the fiber while controlling a drawing speed, adjusting a diameter of the fiber to a diameter passable through a die, and arranging the die around the fiber having the diameter passable through the die. | 05-16-2013 |
20140007624 | METHOD FOR CONTROLLING DIAMETER OF GRIN LENS FIBER AND FIBER DRAWING EQUIPMENT - When a GRIN lens fiber is drawn from a preform, control of a fiber diameter is improved in order to increase a production yield of the GRIN lens fiber having a fiber diameter within a desired range. The problem is solved by controlling the drawing speed using a fiber diameter c, which is obtained by correcting a fiber diameter a using the fiber diameter b and a fiber diameter α. The fiber diameter a is measured using a diameter measuring instrument A that measures an outer diameter of the GRIN lens fiber, which is being elongated inside a heating furnace, the fiber diameter b is measured using a diameter measuring instrument B that measures an outer diameter of the GRIN lens fiber outside the heating furnace, and the fiber diameter α is a value of the fiber diameter a measured a specified period of time T earlier. | 01-09-2014 |
20140069144 | METHOD OF PROCESSING GLASS OPTICAL FIBER AND METHOD OF DRAWING OPTICAL FIBER - A method of drawing an optical fiber in which a glass optical fiber is drawn while fusing by heating and pulling by a pulling mechanism one end of an optical fiber preform made of glass, includes drawing the glass optical fiber from the one end of the optical fiber preform while controlling a drawing speed to make an external diameter of the glass optical fiber larger than an external diameter of a product-to-be glass-optical fiber to be used to manufacture a product. The method includes adjusting an external diameter of the glass optical fiber to an external diameter passable through a die for forming a coating. The method also includes arranging the die around the glass optical fiber having the external diameter passable through the die. | 03-13-2014 |
20150007616 | GLASS BASE MATERIAL ELONGATING METHOD - To manufacture glass base material with high manufacturing yield, provided is a glass base material elongating method comprising forming a tapered portion where the outer diameter of the glass base material changes continuously, holding the glass base material with chucks, heating the glass base material held by chucks with a heat source, and with a portion of the glass base material softened, increasing the distance between the chucks to elongate the glass base material. The elongation begins from a state in which a position of the heat source at a position at which the outer diameter of the glass base material is set in a range from no less than 95% to no more than 98% of an average outer diameter of the trunk portion of the glass base material. | 01-08-2015 |
20150027170 | METHOD FOR PRODUCING OPTICAL FIBER - Provided is a method for producing an optical fiber having low attenuation and including a core that contains an alkali metal element. An optical fiber preform that includes a core part and a cladding part is drawn with a drawing apparatus | 01-29-2015 |
20150323434 | APPARATUSES FOR SCREEN TESTING AN OPTICAL FIBER AND METHODS FOR USING THE SAME - In one embodiment, an apparatus for screen testing an optical fiber includes a fiber conveyance pathway, a capstan having an outer circumference and a fiber contact region extending around the outer circumference, the fiber contact region having a durometer hardness of less than or equal to about 40 Shore A, where the capstan is positioned adjacent to the fiber conveyance pathway such that when the optical fiber is directed over the fiber conveyance pathway, the optical fiber engages with the fiber contact region, and a pinch belt positioned adjacent to the fiber conveyance pathway such that the fiber conveyance pathway extends between the pinch belt and the fiber contact region, where the pinch belt is engagable with the fiber contact region such that, when the optical fiber is directed over the fiber conveyance pathway, the optical fiber is impinged between the pinch belt and the fiber contact region. | 11-12-2015 |
065382000 | Diameter or coating thickness | 9 |
20080271493 | Method for elongating a glass body - A method of elongating a glass body is provided, in which method the axial variation in the inner refractive index structure of a glass body can be restrained. The method comprises: ( | 11-06-2008 |
20100005837 | METHOD OF MANUFACTURING AN ELONGATED GLASS BODY - A method of manufacturing an elongated glass body by elongating a glass body of columnar or cylindrical shape. The method comprises: (1) a first elongating step for obtaining an intermediate elongated body, where the glass body is softened by heating and elongated, while the diameter of the softened part is measured, so that the measured value may become equal to a first controlled diameter which is larger than the target diameter, where the diameter of the intermediate elongated body satisfies the relationship at each position thereof: (the target diameter−10 μm)<(the diameter of the intermediate elongated body)<(the target diameter+500 μm); and (2) a second elongating step for obtaining an elongated glass body having the target diameter, where the intermediate elongated body is softened by heating and elongated. | 01-14-2010 |
20110016925 | METHOD FOR CONTINUOUSLY FORMING OPTICAL FIBER CONNECTOR GLASS AND OTHER CLOSE TOLERANCE TUBES - A method and device for making high precision glass tubes. A glass rod is pushed into a heated chamber and the tube is pulled from the chamber. Preferably, both the push rate and the pull rate are controlled. Fiber optic glass ferrules and other components manufactured by the use of this invention have precision dimensions that fall well within the tight dimensional tolerances required for ferrules and others. | 01-27-2011 |
20120060560 | APPARATUS FOR FABRICATING A GLASS ROD AND METHOD OF SAME - The present invention provides an apparatus and a method for fabricating a glass rod capable of suppressing a diameter fluctuation of a drawn glass rod even in a case of a relatively large diameter reduction ratio between a glass preform and a glass rod, such as 60 to 95%. The diameter (D) of the glass preform for determining the ratio from a measured diameter data is acquired, the measured diameter data is obtained by measuring a diameter of the glass preform before being drawn along a longitudinal direction of the preform, and the feed speed (V1) is determined so that the feed speed (V1) varies depending on a fluctuation of the measured diameter data in the longitudinal direction. | 03-15-2012 |
20120103023 | METHOD OF MANUFACTURING GLASS PREFORM - According to one embodiment, there is provided a method of manufacturing a glass preform, including: obtaining a glass-fine-particle deposit by a VAD process; and heating the obtained glass-fine-particle deposit at a high temperature, thereby manufacturing a transparent glass preform, wherein, while depositing glass fine particles, in addition to monitoring a deposition shape of the glass-fine-particle deposit and controlling a pull-up rate of the glass-fine-particle deposit, there is controlled at least any of: flow rates of glass starting gases to be charged into glass-fine-particle producing burners; flow rates of flame forming gases to be charged into the glass-fine-particle producing burners; and positions of the glass-fine-particle producing burners relative to the glass-fine-particle deposit, so that the deposition shape may become a target shape, and wherein the deposition of the glass fine particles is stopped in a case where the deposition shape deviates from the target shape. | 05-03-2012 |
20140090426 | METHOD OF MANUFACTURING POROUS GLASS DEPOSITION BODY FOR OPTICAL FIBER - Provided is a method of manufacturing a porous glass deposition body for optical fiber comprising depositing silica powder on a starting member being raised and rotated by using burners with different deposition positions. With a glass raw material flow rate supplied to a core deposition burner represented by F | 04-03-2014 |
20140230494 | Production Method of Quartz Glass - A method of manufacturing quartz glass includes depositing soot generated by flame hydrolysis of a raw material gas to a starting member, while the starting member is raised and rotated, to form a soot deposition member that includes an effective portion having a substantially constant outer diameter, the effective portion to become a material of a glass product, an upper ineffective portion formed at an upper end of the effective portion, and a lower ineffective portion formed at a lower end of the effective portion, each of the ineffective portions having an outer diameter changing in a tapering form, wherein the depositing includes forming the lower ineffective portion while decreasing a peripheral speed of a surface of the starting member to a predetermined final peripheral speed in a ratio of 1.3 m/minute or below per second during a period after the effective portion is formed. | 08-21-2014 |
20150299023 | PROCESSING METHOD OF GLASS BASE MATERIAL FOR OPTICAL FIBER - Provided is a method of processing a glass base material for optical fiber in which the glass base material for optical fiber is elongated to reduce a diameter thereof until reaching a final elongation diameter and form a completed base material. The method includes measuring an outer diameter distribution that includes an outer diameter of the glass base material for optical fiber; setting an effective region; calculating a target elongation diameter that is larger than the final elongation diameter and less than an average diameter of the effective region, and elongating the glass base material for optical fiber until reaching the target elongation diameter; and after reaching the target elongation diameter, further elongating the glass base material for optical fiber until reaching the final elongation diameter. | 10-22-2015 |
20160023939 | ISOTHERMAL PLASMA CVD SYSTEM FOR REDUCED TAPER IN OPTICAL FIBER PREFORMS - A chemical vapor deposition (CVD) system is configured to reduce the presence of geometrical and optical taper at the end sections of the preform, or more generally controlling the axial profile of the fabricated optical fiber preform. The system is configured to create an isothermal plasma within the substrate tube, with a relatively confined deposition zone located upstream of the plasma. A reagent delivery system is configured to adjust the composition and concentration of the introduced species in sync with the movement of the plasma and deposition zone within the substrate tube. By synchronizing the movement of the plasma with the adjustable reagent delivery system, it is possible to provide precision control of the axial profile of the created optical fiber preform. | 01-28-2016 |
065384000 | Temperature | 9 |
20090145168 | OPTICAL FIBER MANUFACTURING METHOD AND OPTICAL FIBER MANUFACTURING APPARATUS - A pressure detecting unit detects a pressure of supplying a resin to at least a hole for forming an innermost resin layer on an optical fiber from among a plurality of successive holes in a coating die. A control unit controls a discharge amount of a constant-rate pump that supplies the resin to the coating die in such a manner that a detected resin pressure becomes a predetermined value, and controls a temperature of the optical fiber so that the temperature of the optical fiber becomes a predetermined temperature in accordance with a variation of the discharge amount of the constant-rate pump. | 06-11-2009 |
20100319404 | PROCESSES AND SYSTEMS FOR MAKING INORGANIC FIBERS - Inorganic fiber production processes and systems are disclosed. One process includes providing a molten inorganic fiberizable material, forming substantially vertical primary fibers from the molten material, and attenuating the primary fibers using an oxy-fuel fiberization burner. Other processes include forming a composition comprising combustion gases, aspirated air and inorganic fibers, and preheating a fuel stream and/or an oxidant stream prior to combustion in a fiberization burner using heat developed during the process. Flame temperature of fiberization burners may be controlled by monitoring various burner parameters. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b). | 12-23-2010 |
20110277510 | APPARATUS AND METHOD FOR THERMAL CONNECTION OF OPTICAL WAVEGUIDES - A splicer comprises a positioning device, in which the fiber ends in general have a residual offset. A memory stores a predetermined relationship between the possible offset and a parameter which controls the application of heat. The parameter which controls the application of heat, for example the splicing time for a predetermined splicing current, is defined on the basis of an actual offset which can be recorded by means of cameras. | 11-17-2011 |
20140230495 | METHOD FOR MANUFACTURING A PRIMARY PREFORM FOR OPTICAL FIBRES - A method for manufacturing a primary preform for optical fibres including surrounding at least part of a hollow substrate tube with a furnace set at a temperature T0, supplying doped or undoped gases to the inside of the tube, creating a reaction zone to promote deposition, and moving the zone back and forth along the length of the tube between to form at least one preform layer, wherein the temperature of the furnace is varied linearly as a function of the thickness of the at least one preform layer to compensate for temperature increases of the tube during deposition. | 08-21-2014 |
20140238080 | Systems and Techniques For Fabricating Optical Fiber Gratings - A resistive heating element is used to fabricate a long-period grating mode converter. The resistive heating element creates a localized heating zone for creating an asymmetric perturbation at a periodic series of axial locations along the length of a segment of optical fiber that supports the propagation of both a symmetric mode and an asymmetric mode. In a further technique, a grating is written with an index contrast value that is higher than a selected optimum value. The heating element is then used to anneal the fiber segment so as to reduce the contrast value of the grating to the selected optimum value. | 08-28-2014 |
20140245796 | PROCESS FOR PRODUCING A CYLINDRICAL COMPONENT MADE OF GLASS BY ELONGATION - A method for using a temperature control loop in order to further develop process control during elongation of a cylindrical preform such that a component strand with high dimensional accuracy can be drawn even in the presence of temperature-effective defects during the elongation process: (a) the continuous measurement of a first temperature value, T | 09-04-2014 |
20150040614 | METHODS OF MAKING OPTICAL FIBER WITH REDUCED HYDROGEN SENSITIVITY THAT INCLUDE FIBER REDIRECTION - A method of making optical fibers that includes controlled cooling to produce fibers having a low concentration of non-bridging oxygen defects and low sensitivity to hydrogen. The method may include heating a fiber preform above its softening point, drawing a fiber from the heated preform and passing the fiber through two treatment stages. The fiber may enter the first treatment stage at a temperature between 1500° C. and 1700° C., may exit the first treatment stage at a temperature between 1200° C. and 1400° C., and may experience a cooling rate less than 5000° C./s in the first treatment stage. The fiber may enter the second treatment stage downstream from the first treatment stage at a temperature between 1200° C. and 1400° C., may exit the second treatment stage at a temperature between 1000° C. and 1150° C., and may experience a cooling rate between 5000° C./s and 12,000° C./s in the second treatment stage. The method may also include redirecting the fiber with a fluid bearing device or an air-turn device. | 02-12-2015 |
20160060155 | METHOD AND DEVICE FOR PRODUCING ROD LENSES - A method for producing rod lenses with an enveloping diameter of the rod lens face of up to 200 mm and an edge length of at least 800 mm. The method is characterized in that fabrication is performed from a cylindrical rod lens element made from synthetic quartz glass material configured as a fused silica ingot. This is performed using a flame hydrolysis method with a direct one stage deposition process of SIO | 03-03-2016 |
20160168007 | METHOD OF MAKING AN OPTICAL FIBER PREFORM AND HANDLE FOR USE IN MAKING OF OPTICAL FIBER PREFORM | 06-16-2016 |