1736results about "Glass making apparatus" patented technology

The invention discloses a basalt fiber multi-bushing wire drawing control method, system and equipment and a medium. The basalt fiber multi-bushing wire drawing control method comprises the following steps that the real-time temperature, the real-time viscosity and the melt flow of a target bushing and the target fiber diameter of the target bushing are obtained; inputting the real-time temperature, the real-time viscosity, the melt flow and the target fiber diameter into a preset dynamic equilibrium equation to obtain a dynamic equilibrium index; whether the dynamic balance index is larger than a preset index threshold value or not is judged, and if yes, the melt flow is input into a preset flow compensation equation to obtain a flow compensation value; after the wire drawing control process is guided to reach preset time based on the flow compensation value, whether the dynamic balance index is larger than a preset index threshold value or not is judged again; if yes, the real-time temperature is input into a preset temperature compensation equation to obtain a temperature compensation value, and the wire drawing control process is guided based on the temperature compensation value, and the wire drawing control method and device have the advantages that the priority sequence of regulation and control indexes can be reasonably planned, and the wire drawing regulation and control efficiency is improved.

The invention relates to the field of optical fiber cable preparation, and discloses an optical fiber cable preparation method and a pressure control device.The method comprises the steps that an optical fiber preform is prepared, and a sleeve is coaxially assembled outside the optical fiber preform; extending the optical fiber preform and the sleeve through two extension pipes; a cavity between one ends of the two extension pipes is blocked through a blocking piece; performing wire drawing treatment on the optical fiber preform, and dynamically adjusting micro-positive pressure and negative pressure in the optical fiber preform and between the optical fiber preform and the sleeve at the same time; the device has the beneficial effects that the problem of low stacking efficiency of the hollow optical fiber caused by deformation of the capillary tube is avoided by setting the micro-positive pressure in the optical fiber preform 1 and the negative pressure between the optical fiber preform 1 and the sleeve 2, the manufacturing efficiency is improved, and the product quality is improved.

The utility model belongs to the technical field of glass fiber production equipment, and particularly relates to a novel sleeve-connection-method wire drawing machine head of a modular structure. The device comprises a machine head main shaft, an upper wire ring, a pull rod seat, a broken bridge type expansion sheet, an on-shaft aluminum rotary drum and a plurality of sections of sleeved aluminum rotary drums, telescopic mechanism installation positions are arranged between the upper wire ring and the sleeved connection type aluminum rotary drum, between the pull rod seat and the on-shaft aluminum rotary drum, between the on-shaft aluminum rotary drum and the sleeved connection type aluminum rotary drum and between every two adjacent sleeved connection type aluminum rotary drums, and expansion piece telescopic mechanisms are arranged in the telescopic mechanism installation positions. And the broken bridge type expansion sheets are connected to the on-shaft aluminum rotary drum and the sleeve type aluminum rotary drum in a clamping and embedding manner. According to the novel sleeve connection method wire drawing machine head with the modular structure, the technical problems that the machining difficulty of a super-long aluminum rotary drum and an expansion piece is large, the machining quality cannot be guaranteed, and disassembly and assembly are difficult during assembly and maintenance are solved; and meanwhile, the control precision and efficiency are improved, and the power consumption of the wire drawing machine is reduced.

The utility model belongs to the technical field of glass fiber production equipment, and particularly relates to a simple and replaceable reversing end sleeve at the two ends of a spiral groove of a groove drum. The device comprises an end sleeve and a tube sleeve, the end sleeve comprises an outer end sleeve and an inner end sleeve. The end sleeves are assembled at the two ends of the groove drum, and the drum sleeve is assembled on the groove drum and close to the end sleeves. A large reversing groove and a small reversing groove are defined between the end sleeve and the barrel sleeve. The groove drum can be maintained by replacing the reversing end sleeve, the technical problem that the whole groove drum needs to be replaced once the groove section at the reversing position of an existing groove drum is damaged is solved, and the production cost is saved, the equipment maintenance difficulty is lowered, and the shutdown overhaul time is shortened.

The utility model belongs to the technical field of glass fiber production, and particularly relates to a half-shaft type transmission dual-purpose thick and thin yarn machine head reciprocating wire drawing machine. The machine head reciprocating wire drawing machine comprises a rack, a first machine head, a first machine head reciprocating supporting mechanism, a machine head reciprocating mechanism, a second machine head, a second machine head reciprocating supporting mechanism, a creeling mechanism, a guide mechanism and a control system. According to the half-shaft type transmission dual-purpose thick and thin yarn machine head reciprocating wire drawing machine and the control method thereof, reciprocating linear motion of the first machine head and the second machine head can be achieved, automatic feeding, creeling, yarn breaking and yarn discharging work of glass fiber yarn can be automatically completed under dispatching of an electric control system, and the production efficiency is improved. The completion quality of wire drawing and winding is improved, and the production capacity of the wire drawing machine is improved. Meanwhile, different machine head structures can be configured for the wire drawing machine, so that the production requirements of roving and spun yarn can be flexibly met.

The utility model belongs to the technical field of glass fiber wire drawing machines, and particularly relates to a rear-end disc type wire drawing machine head capable of automatically adjusting and avoiding a wire drawing resonance area on line. The device comprises a machine head main shaft, a bearing seat, a cylinder body, a piston, a front seat, a rear seat, a barrel replacing body and a vibration reduction component, when the machine head operates, the bearing seat, the cylinder body, the piston, the front seat, the rear seat, the barrel replacing body and the vibration reduction component form an online rigid adjusting mechanism for the soft support of the machine head. The vibration of the machine head can be detected in real time through the vibration sensor and fed back to the PLC for control, the gas flow and / or the gas pressure are / is adjusted through the proportional valve PID, online real-time data collection and exchange are achieved, dynamic closed-loop control over the machine head rigidity adjusting mechanism on the bearing seat is achieved, and the vibration of the machine head is controlled within an acceptable range all the time.

The invention discloses a cooling device and glass fiber production equipment, and relates to the technical field of glass fiber production, and the cooling device comprises a spray pipe, an air supply pipeline, a control valve and a control system. Wherein the spray pipe is provided with a plurality of air nozzles distributed at intervals along the longitudinal direction, the plurality of air nozzles are used for spraying air flow towards one side deviating from the bushing so as to form an air vortex capable of reducing the temperature of the bushing and the root of the glass fiber on one side deviating from the bushing of the spray pipe, and the air supply pipeline is connected with the spray pipe and is used for supplying the air flow to the spray pipe; the control valve is arranged on the air supply pipeline and used for controlling the flow of airflow in the air supply pipeline, and the control system is in communication connection with the control valve and used for controlling the opening degree of the control valve according to the wire drawing operation state. The cooling device can stabilize the temperature of the bushing plate when the wire drawing operation is interrupted or the machine head is switched, reduces the number of waste products, and meets the cooling requirement of the bushing plate with high hole number for producing small-diameter fibers, so that the productivity and the economic benefit of a wire drawing operation unit are improved.

The utility model belongs to the technical field of glass fiber production, and particularly relates to a novel multi-drawing wire drawing machine head with a modular structure. The machine head comprises a machine head main shaft, an upper wire ring, a pull rod seat, a broken bridge type expansion sheet and a plurality of sections of sectional type aluminum rotary drums, expansion piece telescopic mechanisms are arranged between the upper wire ring and the sectional type aluminum rotary drum, between the sectional type aluminum rotary drum and the pull rod base and between every two adjacent sections of sectional type aluminum rotary drums. The expansion piece telescopic mechanism comprises a piston ring, a slope sliding block ring, a connecting rod sliding block, a connecting rod, a sliding block ring top spring, a sliding block tension spring and an expansion piece tension spring. According to the novel multi-split wire drawing machine head with the modular structure, the technical problems that the machining difficulty of an ultra-long aluminum rotary drum and an ultra-long expansion sheet is large, the machining quality cannot be guaranteed, and disassembly and assembly are difficult during assembly and maintenance are solved; and meanwhile, the control precision and the expansion piece stretching efficiency are improved, and the power consumption of the wire drawing machine is reduced.

The utility model belongs to the technical field of glass fiber wire drawing machines, and particularly relates to a wire drawing machine head with an inward taper, which can automatically adjust and avoid a wire drawing resonance area on line. The device comprises a machine head main shaft, a bearing seat, a front seat, a rear seat, a front taper sleeve, a rear taper sleeve and a vibration reduction component, the front taper sleeve and the rear taper sleeve are both arranged on the bearing seat, and the conical surfaces are matched with the front conical part and the rear conical part respectively; the front seat is arranged on the bearing seat, and a front sealing cavity is formed between the front seat and the front taper sleeve; the rear seat is arranged on the bearing seat, and a rear sealing cavity is formed between the rear seat and the rear taper sleeve; the front and rear sealing cavities are respectively provided with front and rear inflation ports. PLC control can be fed back through machine head vibration real-time detection, proportional valve PID adjustment is adopted, online real-time data collection and exchange are achieved, a soft supporting vibration reduction device on a bearing seat is controlled, and vibration is controlled within an acceptable range.

The invention belongs to the technical field of optical fiber manufacturing, and discloses a self-marking type anti-resonance hollow-core optical fiber and a preparation method thereof. The self-marking type anti-resonance hollow-core optical fiber comprises a cladding sleeve, a cladding anti-resonance group and a self-marking unit, the cladding anti-resonance group is fixed on the inner wall of the cladding sleeve; the self-marking unit is positioned in the cladding sleeve, so that at least one cladding anti-resonance group is distinguished from other cladding anti-resonance groups; and a central region defined by the cladding anti-resonance group is a fiber core. According to the self-marking type anti-resonance hollow-core optical fiber, the cladding anti-resonance group in the anti-resonance hollow-core optical fiber can be quickly identified in the wire drawing process, the size of the cladding anti-resonance group can be conveniently regulated and controlled on line, and the transmission performance of the anti-resonance hollow-core optical fiber is not influenced.

The utility model relates to a preform rod bending detection device and correction system, the device comprises: a first detection assembly comprising a first laser emitter and a first laser receiver, the first laser emitter emits a first light beam along a first linear direction, the first laser receiver is used for receiving the first light beam, and the first laser receiver is used for receiving the first light beam; the first laser transmitter and the first laser receiver are arranged on the two sides of the reference axis in the radial direction, and the reference axis is perpendicular to the first linear direction and the second linear direction and located in a light path of the first light beam; the second detection assembly comprises a second laser emitter and a second laser receiver, the second laser emitter is used for emitting a second light beam in the second linear direction, the second laser receiver is used for receiving the second light beam, and the second laser emitter and the second laser receiver are arranged on the two sides of the reference axis in the radial direction; the reference axis is located in a light path of the second light beam. According to the invention, accurate detection of the bending direction and the bending degree of the handle bar to be detected can be realized.

To provide a glass fiber and method for producing the same.SOLUTION: The method for producing a glass fiber includes a covering process, a sintering process, a mixing process, and spinning process. The covering process is implemented by covering a tungsten compound onto surfaces of a plurality of inorganic particles to form a plurality of surface treated inorganic particles. The sintering process is implemented by sintering the surface treated inorganic particles in a nitrogen atmosphere having a temperature of between 400°C and 1,000°C. The mixing process is implemented by mixing the surface treated inorganic particles into a glass raw material that is in a molten state. The spinning process is implemented by spinning from the glass raw material comprising the surface treated inorganic particles to form a plurality of glass fibers.SELECTED DRAWING: Figure 1

To provide glass fiber yarn and a method for manufacturing the same.SOLUTION: A method for manufacturing glass fiber yarn comprises a coating step of coating a molybdenum compound on the surfaces of inorganic particles to form the surface-treated inorganic particles; a sintering step of sintering the surface-treated inorganic particles on a temperature condition of 400 to 1,000°C in a nitrogen gas atmosphere; a mixture step of mixing the surface-treated inorganic particles into a molten glass raw material; and a spinning step of spinning the molten glass raw material including the surface-treated inorganic particles to form glass fiber yarns.SELECTED DRAWING: Figure 1

The utility model belongs to the technical field of glass fiber drawing machines, and particularly relates to a drawing machine head with an outward taper, which can automatically adjust and avoid a drawing resonance area on line. The device comprises a machine head main shaft, a bearing seat, a front taper sleeve, a rear taper sleeve, a barrel replacing body, a sealing cavity and an inflation inlet, the taper of the front taper sleeve and the taper of the rear taper sleeve face outwards, and the conical surfaces of the front taper sleeve and the rear taper sleeve are opposite. When the machine head of the wire drawing machine operates, real-time detection and feedback of PLC control can be realized through the machine head vibration sensor, and PID adjustment of the proportional valve is adopted, so that online real-time data acquisition and exchange are realized, a soft support vibration reduction device on a bearing seat is controlled, vibration of the machine head is automatically controlled within a suitable range, and online closed-loop real-time adjustment of rigidity of the machine head is realized.

A high-power single-frequency laser amplifier based on prepared YAG derivative optical fibers comprises a single-frequency optical fiber laser seed source, the output end of the single-frequency optical fiber laser seed source is connected with the input end of a first-stage pre-amplifier, and the output end of the first-stage pre-amplifier is connected with the input end of a second-stage pre-amplifier. The output end of the secondary preamplifier is connected with the input end of the high-power double-cladding circulator, and the output end of the high-power double-cladding circulator is connected with a signal light input port of the high-power pumping signal beam combiner. The output end of the high-power pumping signal beam combiner is connected with one end of a specially prepared large-mode-field low-NA double-cladding rare earth doped YAG derivative optical fiber, and the other end of the large-mode-field low-NA double-cladding rare earth doped YAG derivative optical fiber is connected with the input end of the cladding light filter. The problem that expansion and diffusion of a fiber core in the YAG derived optical fiber are not controlled is solved, and therefore the theoretical power limit of single-frequency optical fiber laser amplification conducted through a silica optical fiber at present is broken through.

The invention discloses a basalt fiber wiredrawing control method, system, equipment and medium, and relates to the technical field of control systems.The basalt fiber wiredrawing control method comprises the steps that a preset time period is set, a current moment and a historical moment are obtained, a historical wiredrawing diameter data sequence is obtained, and a stability index is obtained; if the stability index exceeds a preset threshold value, a historical melt viscosity data sequence is obtained, the viscosity change direction is obtained, and the wire drawing diameter change direction is obtained; if the diameter change direction is decreased, the minimum viscosity value is obtained, a first pretreatment reference viscosity value is formed, the viscosity value of the to-be-monitored melt is obtained, and if the viscosity value of the to-be-monitored melt is smaller than the first pretreatment reference viscosity value, the temperature of the bushing plate is decreased; if the diameter change direction is increased, the maximum viscosity value is obtained, a second pretreatment reference viscosity value is formed, the viscosity value of the to-be-monitored melt is obtained, and if the viscosity value of the to-be-monitored melt is larger than the second pretreatment reference viscosity value, the temperature of the bushing plate is increased. The device has the advantages that the wire drawing quality is improved, the energy efficiency is optimized, and the control is accurate.

The invention discloses a basalt fiber wiredrawing adjusting method, system, equipment and medium, and relates to the technical field of basalt fiber wiredrawing control, and the basalt fiber wiredrawing adjusting method comprises the following steps: obtaining melt viscosity in a pouring furnace; judging whether the melt viscosity is within the range of a preset viscosity threshold value or not, if yes, returning to obtain the melt viscosity in the pouring furnace, and if not, continuously obtaining a plurality of wire drawing state images of the basalt fiber in unit time; according to the multiple wire drawing state images, whether wire drawing abnormal characteristics exist or not is recognized, if not, the operation is returned to the step of obtaining the melt viscosity in the pouring furnace, and if yes, a first temperature adjusting parameter is obtained; wherein the first temperature adjusting parameter is used for adjusting the melt temperature in the pouring furnace; the first temperature adjusting parameter is input into the viscosity-temperature initial curve of the wire drawing process so as to update and obtain the viscosity-temperature target curve, and the method has the advantages that self-adaptive adjustment can be achieved, and the adjusting efficiency is improved.

The invention discloses a hollow-core optical fiber microstructure size dynamic nondestructive measurement and control system, which is characterized in that a spectral confocal detection module acquires spectral signals reflected by each interface of the cross section of a hollow-core optical fiber from the side surface of the hollow-core optical fiber by using a dispersion confocal principle in a hollow-core optical fiber drawing process, and converts the spectral signals into spectral data; the data analysis module outputs an axial peak value calculated value by using a neural network model according to the spectral data, and converts the axial peak value calculated value into the diameter of a nested glass tube in the nested structure unit; the regulation and control module outputs an airflow regulation instruction according to the difference between the diameter of the nested glass tube and a preset value; the airflow control module adjusts the size of airflow entering the hollow-core optical fiber according to the airflow adjusting instruction, and then the diameter of the nested glass tube is adjusted. According to the invention, the diameter of the nested structure unit in the hollow-core optical fiber can be accurately measured in the production process, and the technological parameters can be adjusted in time according to the product state.

The utility model belongs to the technical field of glass fiber production, and particularly relates to a novel hollow shaft wire drawing machine head of a modular structure. The device comprises a hollow main shaft, an air delivery pipe, a sectional type aluminum rotary drum, broken bridge type expansion pieces and expansion piece telescopic mechanisms. The hollow main shaft comprises a front-end winding shaft body and a rear-end assembling shaft body, a front-end cavity is formed in the front-end winding shaft body, and an in-shaft air path is arranged in the rear-end assembling shaft body; a pipe body gas path is arranged in the gas conveying pipe, the gas conveying pipe is arranged in the front end cavity, and the pipe body gas path is communicated to the in-shaft gas path; the sectional type aluminum rotary drum comprises a plurality of sections of aluminum rotary drum single bodies, and the aluminum rotary drum single bodies are fixedly assembled on the front end winding shaft body. The broken bridge type expansion sheets are movably clamped and embedded on the aluminum rotary drum single bodies; the expansion piece telescopic mechanisms are arranged at the two ends of the aluminum rotary drum single bodies so as to drive the broken bridge type expansion pieces to stretch out and draw back.

The invention relates to the technical field of optical fibers, in particular to a preparation method of a spiral annular core coaxial double-waveguide type rare earth-doped optical fiber. According to the preparation method provided by the invention, the central rare-earth-doped core rod, the annular core rod and the quartz tube are prepared by rod assembling, so that the process of drilling and external processing on the rod body is avoided, the hole of the rod body does not need to be polished and cleaned, the process difficulty is reduced, and meanwhile, the production cost is reduced. According to the preparation method provided by the invention, the annular core rod can be spirally wound on the central rare-earth-doped core rod only by rotating the annular core rod, and the whole rod body does not need to be rotated, so that the problem that the optical performance of the fiber core is influenced by torsion stress generated by rotation of the central rare-earth-doped core rod is avoided.

The invention provides a fire-resistant inorganic fiber cotton board and a preparation method thereof, and belongs to the technical field of fire-resistant materials. The preparation method comprises the following steps: carrying out acid leaching treatment on sepiolite powder by using phosphoric acid, loading ammonium polyphosphate, drying and crushing to obtain a product A; enabling DOPO to react with gamma-aminopropyltriethoxysilane, and stirring and dissolving to obtain a product B; methyltrimethoxysilane and diethanol amine are subjected to hydrolytic polycondensation, dibutyltin dilaurate is added for continuous reaction, and a product C is obtained; combining raw materials including sodium silicate, potassium silicate, the product A, the product B, the product C and the like to prepare a curing liquid; melting and centrifuging the slag into cotton, and carrying out wet forming to obtain an inorganic fiber cotton plate rough blank; and the inorganic fiber cotton board rough blank is subjected to vacuum dehydration, then a curing liquid is sprayed, and the fireproof inorganic fiber cotton board is obtained after drying. The inorganic fiber cotton board is subjected to double-sided spraying by adopting the new curing liquid, so that the fireproof performance is high, and the mechanical property of the inorganic fiber cotton board can be enhanced.

A hollow-core optical fiber (HCF) configured to guide light waves through anti-resonance, the hollow-core optical fiber comprising a tubular glass sheath; a hollow core defined in the central inner cavity of the sheath and having a polygonal shape in a cross section; and a cladding located in the central lumen and comprising flat, planar glass films, each having two opposing edges extending along the length of the HCF, a film thickness lt; the films are arranged in a plurality of groups, each group comprising: a core boundary film defining one side of a polygonal shape; and at least one cladding film between the core boundary film and the sheath, all films in the group being spaced apart; wherein each side of the polygonal shape is formed by a core boundary film, each film being anchored to the sheath only along its two opposite edges, and there is no contact between any films.

The invention relates to the technical field of glass fiber materials, in particular to glass fiber cloth and a preparation method thereof. Through multi-angle technical improvement of base material component innovation, composite modifier design and preparation parameter synergy, the glass fabric with high strength, high elasticity and strong oxidation resistance is prepared, the requirements of aerospace, high-end electronics and other fields with strict requirements for material performance can be met, and remarkable technical value and market potential are achieved.

The invention provides a fiber drawing temperature control system for low-dielectric glass fibers, relates to the technical field of fiber drawing temperature control, and aims at monitoring the temperature of each area of a fiber bushing in the preparation process of the low-dielectric glass fibers in real time. Generating a temperature change curve of each area in the fiber bushing through the monitored temperature data, extracting temperature variation characteristics of each area in the corresponding temperature change curve, and constructing a temperature variation trend chart of the fiber bushing based on the temperature variation characteristics of each area; obtaining a theoretical temperature distribution diagram of fiber drawing in the preparation process of the low-dielectric glass fiber, and determining a regional temperature regulation and control sequence of the fiber bushing according to the temperature variation trend diagram and the theoretical temperature distribution diagram; according to the application, the wire drawing temperature of the fiber bushing can be accurately regulated and controlled in the fiber wire drawing process, so that the production quality of the low-dielectric glass fiber is improved.

Provided is a glass composition which has a low linear expansion coefficient and a high Young's modulus and is suitable for mass production. The present invention provides, in mass%: i) a glass composition containing 56 < = SiO2 < = 70, 0.1 < = B2O3 < = 8, 15 < = Al2O3 < = 24, 4 < = MgO < = 14, 0 < = CaO < = 4, 0 < = ZnO < = 10, 0 < = (Li2O + Na2O + K2O) < = 4, 0.1 < = ZrO2 < = 5, and substantially not containing TiO2; the present invention relates to a glass composition comprising (i) a glass composition containing 56 < = SiO2 < = 70, 0.1 < = B2O3 < = 8, 15 < = Al2O3 < = 24, 4 < = MgO < = 14, 0 < = CaO < = 4, 0.1 < = ZnO < = 3, 0 < = (Li2O + Na2O + K2O) < = 4, and substantially not containing TiO2 and ZrO2, and iii) a glass composition containing 56 < = SiO2 < = 70, 0.1 < = B2O3 < = 8, 15 < = Al2O3 < = 24, 4 < = MgO < = 14, 0 < = CaO < = 4, 0 < = ZnO < = 10, 0 < = (Li2O + Na2O + K2O) < = 4, and 1 < = ZrO2 < = 5.

A method of analysing a hollow core antiresonant optical fibre having an inner cladding comprising at least one capillary defined by a wall with a wall thickness comprises: directing light onto the fibre for interaction with at least one surface of the capillary wall; detecting a portion of the light which has interacted with the at least one surface of the capillary wall to determine a power level of the detected portion; and using the power level to deduce information regarding the wall thickness.

An optical fiber or a preform from which the fiber may be drawn may include an outer cladding layer, an inner cladding layer, a first core, and a second core. Each core may be in contact with at least the inner cladding layer and under frozen-in compressive axial stress. The refractive index of the inner cladding layer may be less than the refractive index of the outer cladding layer.

A method of manufacturing an optical fiber, the method including mounting a glass sleeve in a selective etching apparatus. The sleeve comprising one or more axial through-holes, and the etching apparatus comprising a first end cap with a central aperture disposed therethrough, the first end cap being attached to a first surface of the sleeve. The method further including exposing the sleeve to an acid solution such that a first portion of the first surface is exposed to the acid solution and a second portion of the first surface is not exposed to the acid solution. The first portion being adjacent to the central aperture when the sleeve is mounted in the selective etching apparatus, and the second portion being covered by the first end cap when the sleeve is mounted in the selective etching apparatus.

To provide a vaporization device capable of vaporizing liquid material efficiently in a large quantity while reducing or preventing gelation of the liquid material.SOLUTION: A vaporization device includes: a tank in which a liquid material used for manufacturing an optical fiber preform is vaporized: an introduction pipe connected to the tank for introducing the liquid material into the tank; a tabular body which is provided inside the tank and to which the liquid material introduced from the introduction pipe is supplied; a first heating unit for heating the tank and the tabular body; and a control unit for controlling the first heating part so as to heat the tank and the tabular body to a boiling point of the material or higher.SELECTED DRAWING: Figure 1A

A method determines a position of a light wave guiding core body of an optical waveguide for machining on a numerically controlled machine tool. The waveguide includes the core body and a shell body enclosing it, both extending from a first end face to a second end face of the waveguide. The method includes providing an optical measurement system, including a light source device and a detection device, and measuring the first end face by the optical measurement system, including irradiating the waveguide by the light source, detecting radiation emitted by the first end face, and determining a position of a center point of the core body on the first end face based on the detected radiation. The optical measurement system is arranged on the machine tool. The measurement of the first end face is performed on the waveguide clamped on the machine table by the optical measurement system.