Search query: fiber drawing analysis

Related papers:

abstract: Abstract We examine the thermal drawing of zinc tellurite silver containing glass. While the silver doped glass fibers remain unchanged over thermal drawing under oxygenatmosphere, we establish that under argon silver doping leads to the growth of a thin, metallic like precipitate at the fiber surface. Optical, chemical and structural analysis, supported by UV vis, HR TEM and XPS, reveals that the precipitate contains silver telluride nanoparticles in its first tens of nanometers. We believe the direct fiber drawing induced synthesis of silver telluride semiconductor compounds could lead to development of new fiber based devices, with applications spanning photonics or sensing.
author_names: Clement Strutynski

Christine Labrugere

Angeline Poulon-Quintin

Marc Dussauze

Frederic Adamietz

Thierry Cardinal

Sylvain Danto
title: In situ fiber drawing induced synthesis of silver tellurium semiconductor compounds
year: 2020

abstract: The Fiber metal laminates (FMLs) combine the advantages of fiber reinforced polymer properties, like stiffness and strength, with metallic alloys, like toughness and durability. These hybrid materials can unravel some problems in the industrial sector, particularly in aerospace, and advanced automotive industry. Still, there are significant challenges in the GLARE sheets forming process even for small drawing ratios, notably smaller and complex shaped fiber metal laminate with low thickness. As a case study, a cylindrical GLARE cup was chosen. This shape with sharp bends and vertical geometrical features, still face many challenges and difficulties in the forming process. Numerical simulations have been used utilizing ABAQUS and compared with the experimental results in the Hydro mechanical deep drawing to achieve good forming quality with higher depth. An extensive investigation of the effect of process variables has been done such as cavity pressure, blank holding force, and blank diameter. Also, their roles in wrinkles formation, tearing and thinning, and formability has been performed. Furthermore, the friction in two cases; cured, and semi cured condition, has been considered. The results show that the application of cavity pressure within specified limits has a positive effect on the quality of the formed cup and leads to higher depths. The same conclusion for the blank holder, which has a positive impact on wrinkling elimination and friction reducing between the aluminum layers and the fiberglass. The result shows that the semi cured condition of the GLARE has a good effect on wrinkling reduction, due to the uniform movement of the fiberglass inside the aluminum layers. Understanding these parameters and the GLARE forming behavior and have a good selection of these parameters can give the advantage to achieve smaller and more complex shapes with higher depth, particularly for mass production. Finally, this study can extend the industrial application areas of FMLs and GLARE parts.
author_names: Hamza Blala

Lihui Lang

Ehsan Sherkatghanad

Lei Li
title: GLARE Hydro Mechanical Deep Drawing Analysis Based on the Forming Depth
year: 2020

abstract: Plasmonic metamaterials are composites containing metal structures imbedded within a dielectric matrix. Their nanoscale structure gives them optical properties that can be nonexistent in naturally occurring materials. However, the requirement for a subwavelength structure creates difficulties when fiber drawing technology is used to fabricate such metamaterials due to Plateau Rayleigh instability effects. This paper addresses the instability issues by combining classic linear stability analysis with scaling considerations for the drawing of a fiber containing a concentric metal core. In terms of the amplitude growth of radial fluctuations, the key operational parameters that influence metal core instability are identified as a function of the metal/dielectric combination, while instability growth is correlated with three dimensionless numbers. To verify these theoretical predictions, a numerical fiber drawing model, developed using a commercial software package (PolyFlow) is employed to simulate the nonisothermal drawing of a polymer preform containing an indium metal core in a cylindrical furnace. Together, these theoretical predictions and numerical simulations provide key insights into conditions that minimize the instability of drawn fiber based metamaterials for optical applications.
author_names: Shicheng Xue

Geoffrey W Barton

Simon Fleming

Alexander J Argyros
title: Analysis of Capillary Instability in Metamaterials Fabrication Using Fiber Drawing Technology
venue: Journal of Lightwave Technology
year: 2017

abstract: As fiberoptics industries have been attempting to use a silica preform of larger diameter in order to reduce facility down time and increase optical fiber manufacturing productivity, this computational study investigates how the use of large sized preform in sized up draw furnace affects high speed glass fiber drawing process. Present computational model for glass fiber drawing simulations employs iterative scheme between one dimensional momentum balance model for neck down profile of heated and softened preform and two dimensional axisymmetric thermo fluid computations of convective and radiative heat transport for preform heating and purge gas flow inside muffle tube. Prediction of preform neck down shape for 10 cm diameter preform has been verified with measured profile from actual optical fiber drawing test. The effects of larger preform diameter up to 20 cm are appreciated and discussed on temperature distribution of preform and drawn glass fiber and fiber draw tension. This study also shows that fine control of heating condition is necessary to maintain proper amount of draw tension in high precision glass fiber drawing.
author_names: Yong Ki Kim

Jin Su Choi

Ho Sang Kwak

Kyoungjin Kim
title: Numerical modeling and analysis of glass fiber drawing process from large sized silica preform
year: 2017

abstract: Fiber optic taper is an important component in the CCD coupling, television imaging and night vision device. Increasing need in high resolution picture transmission devices requires better quality of high ratio fiber optic taper. The resulting taper shape is important as it affects transmission properties of fiber optic taper. This paper develops a physical model for analyzing the high ratio fiber optic taper time dependent fabricating process. Based on the physical model, the evolution of the taper's neckdown profile is analyzed. Simulation results demonstrate that viscosity of materials, furnace geometry, temperature distribution in the furnace and the external tensile force will strongly affect the drawing process. The final shape of fiber optic taper depends on material properties and heating profile. The tensile force, which will affect the evolution process, has a minor influence on the taper's final shape. Based on the understanding of the above analysis, an improved drawing design can be proposed for fabricating large radius fiber optic taper with high ratio.
author_names: Jiahui Liu

Lili Zheng
title: Theoretical and Numerical Analysis for Design of High Ratio Fiber Optic Taper Drawing Process
venue: IEEE Photonics Journal
year: 2020

abstract: Sampled fiber grating is a special superstructure fiber Bragg grating with a wide range of applications in many fields. In this work, based on drawing tower in line fabrication system, a new preparation method of the sampled fiber grating is proposed and experimentally demonstrated. Experimental result shows that the obtained sampled fiber gratings possess dense reflection spectra, with a minimum reflection peak interval of only 0.09nm. This method exhibits promising application prospect in the fabrication of the high quality sampled fiber grating. On the other hand, the spectral characteristics of the sampled fiber grating are analyzed when the sub grating is affected by the external physical quantities such as, in this paper, strain. Wavelength shift and intensity change in the reflection peak of the spectra indicate that the grating is affected differently by micro strains, due to the different spatial positions along the axis of the sampled fiber grating. This work is aimed at exploring the potential applications of the sampled fiber grating in quasi distributed micro area sensing with the millimeter level.
author_names: Yu Zheng

Wenjing Gao

Haihu Yu

Huiyong Guo

Shan Jiang

De-sheng Jiang
title: Drawing Tower In Line Fabrication and the Spectrum Analysis of Sampled Fiber Grating
venue: Photonic Sensors
year: 2019

abstract: The thermal effects of the necking in fiber drawing, with respect to the change of microstructure and deformation thermodynamics, have been studied in this paper. The microstructure change before and after necking was characterized by differential scanning calorimeter, revealing the significant variations of crystallinity of polyester (PET) fiber. According to the thermal effect feature during the fiber cold drawing process, deformation thermodynamics is established to analyze the necking mechanism. Internal energy increase in polypropylene fiber may be caused by melting of crystal or stored elastic strain energy, while the internal energy of PET fiber decreases with time, probably caused by the induced crystallization.
author_names: Yun Liao

Decai Shan

Zhifang Liu

Meng Wang
title: Thermal analysis of the necking phenomenon in fiber drawing
venue: Journal of Thermal Analysis and Calorimetry
year: 2015

author_names: Go Dongwoo

Takarada Wataru

Aneja Arun

Kikutani Takeshi
title: Analysis of fiber structure and properties of drawn fibers prepared by cold drawing in ethanol and subsequent hot drawing
year: 2020

abstract: We demonstrate a high throughput method for synthesizing zinc selenide (ZnSe) in situ during fiber drawing. Central to this method is a thermally activated chemical reaction occurring across multiple interfaces between alternately layered elemental zinc (Zn and selenium (Se rich films embedded in a preform and drawn into meters of fiber at a temperature well below the melting temperature of either Zn or ZnSe. By depositing 50 nm thick layers of Zn interleaved between 1 mm thick Se layers, a controlled breakup of the Zn sheet is achieved, thereby enabling a complete and controlled chemical reaction. The thermodynamics and kinetics of this synthesis process are studied using thermogravimetric analysis and differential scanning calorimetry, and the in fiber compound is analyzed by a multiplicity of materials characterization tools, including transmission electron microscopy, Raman microscopy, energy dispersive X ray spectroscopy, and X ray diffraction, all resulting in unambiguous identification of ZnSe as the compound produced from the reactive fiber draw. Furthermore, we characterize the in fiber ZnSe/Se97S3 heterojunction to demonstrate the prospect of ZnSe based fiber optoelectronic devices. The ability to synthesize new compounds during fiber drawing at nanometer scale precision and to characterize them at the atomic level extends the architecture and materials selection compatible with multimaterial fiber drawing, thus paving the way toward more complex and sophisticated functionality.
author_names: Chong Hou

Xiaoting Jia

Lei Wei

Alexander M Stolyarov

Ofer Shapira

John D Joannopoulos

Yoel Fink
title: Direct atomic level observation and chemical analysis of ZnSe synthesized by in situ high throughput reactive fiber drawing.
venue: Nano letters
year: 2013

abstract: Abstract This paper describes the first synthesis of YbPO 4 nano cylinders and nanoparticles within optical fiber preforms. To obtain YbPO 4 doped silica monoliths, phosphosilicate powders, previously prepared by a sol gel method, were impregnated with a solution containing an ytterbium salt. Then, they were compressed into cylinders and sintered at high temperature. These doped monoliths were densified under controlled atmosphere and then drawn at high temperature into 1.6 mm diameter rods. The composition, structural and optical properties of these monoliths and rods were investigated using Electron Probe Micro Analysis, Transmission Electron Microscopy (TEM) Raman spectroscopy and IR absorption measurements. The size of the YbPO 4 nanoparticles within the monoliths were found to be in the range of 8 15 nm and 13 25 nm, depending on the Yb doping amount. Upon drawing the most concentrated Yb doped monoliths into rods, the nanoparticles evolve to form nano cylinders with a mean diameter around 40 nm and a length of about 400 nm. Similar behavior was observed for the less concentrated Yb doped monoliths, once drawn into rods but a lower number of nano cylinders were found in this case. Structural analysis, based on Raman spectroscopy and TEM experiments, shows that all these nano objects have a tetragonal xenotime structure (I4 1 /amd Moreover, it was found that the nano cylinders were all aligned parallel to the drawing direction. These SiO 2 P 2 O 5 :YbPO 4 glass ceramics exhibit a structured absorption spectra around 980 nm, which corroborates the Yb 3+ crystalline environment.
author_names: Christophe Kinowski

Hicham El Hamzaoui

Bruno Capoen

Geraud Bouwmans

Anne-Marie Blanchenet

Karen Delplace

Benoit Prochet

Mohamed Bouazaoui
title: YbPO4 nano cylinders formation and alignment within optical fiber preforms using fiber drawing process
year: 2018