Birefringence Reducing Precision Replication Process Assisted by Infrared Radiation

2002 ◽  
Vol 124 (2) ◽  
pp. 111-114 ◽  
Author(s):  
Kimitoshi Sato ◽  
Yasuo Kurosaki
Keyword(s):  
Infrared Radiation ◽  
External Source ◽  
Work Piece ◽  
Molding Process ◽  
Replication Process ◽  
Replication Procedure ◽  
Two Stages

This paper proposes a novel precision replication procedure having two stages: a molding process and a replication process assisted by an infrared radiation from an external source, and possessing the effect of birefringence reduction simultaneously. The experiments had been conducted for the replication process of CD. The proposed process has been proved to be feasible for the submicron replication by heating the surface of the resin, therefore, the reduction of birefringence remained in a work piece by some tens seconds irradiation.

To Fabricate Bragg Grating on D-Shaped Optical Fibre by Micro-Pressing Method

2013 ◽  
Vol 311 ◽  
pp. 472-476
Author(s):  
Fang Chang Hsu ◽  
Farn Tsei Chen ◽  
Chi Ting Ho
Keyword(s):  
Optical Fiber ◽  
Interference Lithography ◽  
Bragg Grating ◽  
Test Results ◽  
Pdms Mold ◽  
Molding Process ◽  
Replication Process ◽  
Pressing Method ◽  
The Core ◽  
Surface Grating

In this paper, we proposed a method to fabricate a D-shaped optical fiber of Bragg surface grating filter component by D-shaped fiber polishing along with photolithography、holographic interference lithography technologies and micro-molding process. The optical fiber was side-polished until it reaches the core of fiber. The master Bragg grating was first fabricated on the positive photoresister by using the holography interference lithography, then the patterned resist was used as a mother mold to transfer the pattern onto a hard polydimethylsiloxane (hPDMS)/ polydimethylsiloxane (PDMS) mold. The gratings pattern on hPDMS/PDMS was then transferred onto the UV polymer on the surface of a D-shaped fiber using a UV replication process. The transmission spectra of the resulting gratings were measured, with test results showing the transmission dip of -17dB , and 3-dB-transmission bandwidth of 9nm.

Using Micro-Pressing Method to Fabricate Bragg Grating on D-Shaped Optical Fiber

2011 ◽  
Vol 314-316 ◽  
pp. 1799-1805
Author(s):  
Chih Wei Hsu ◽  
Feng Tsai Weng ◽  
Chi Ting Ho
Keyword(s):  
Optical Fiber ◽  
Interference Lithography ◽  
Bragg Grating ◽  
Test Results ◽  
Pdms Mold ◽  
Molding Process ◽  
Replication Process ◽  
Pressing Method ◽  
The Core ◽  
Surface Grating

In this paper, we proposed a method to fabricate a D-shaped optical fiber of Bragg surface grating filter component by D-shaped fiber polishing along with photolithography、holographic interference lithography technologies and micro-molding process. The optical fiber was side-polished until it reaches the core of fiber. The master Bragg grating was first fabricated on the positive photoresister by using the holography interference lithography, then the patterned resist was used as a mother mold to transfer the pattern onto a hard polydimethylsiloxane (hPDMS)/ polydimethylsiloxane (PDMS) mold. The gratings pattern on hPDMS/PDMS was then transferred onto the UV polymer on the surface of a D-shaped fiber using a UV replication process. The transmission spectra of the resulting gratings were measured, with test results showing the transmission dip of -17dB , and 3-dB-transmission bandwidth of 9nm.

Simulation of non-isothermal resin transfer molding process cycle and optimization of temperature system

2018 ◽  
Vol 38 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Wenkai Yang ◽  
Shihong Lu ◽  
Lintong Xiang ◽  
Wenhao Liu
Keyword(s):  
Resin Transfer Molding ◽  
Three Dimensional ◽  
Molding Process ◽  
Influence Of Temperature ◽  
Transfer Molding ◽  
Influence Of Temperature On ◽  
Fluent Software ◽  
Dimensional Simulation ◽  
Two Stages

The filling and curing stage of resin transfer molding is non-isothermal. The temperature plays an important role in both filling and curing stage and these two stages are strongly interrelated. The unreasonable temperature system will lead to excessive temperature difference and seriously affect the quality of the product. Therefore, it is necessary to analyze the non-isothermal filling and curing stage to find the best temperature system. In this paper, the FLUENT software has been secondarily developed to perform a full three-dimensional simulation of the non-isothermal resin transfer molding process cycle. The results have been compared with the known data to verify the accuracy of the simulation. The influence of temperature on the process cycle has been analyzed and the optimization of temperature system can reduce process cycle time and increase the uniformity of temperature distribution.

scholarly journals DETERMINING NOMINAL VALUES OF INPUT PARAMETERS FOR PRODUCTION PROCESS USING DOE

2021 ◽  
Vol 24 (1) ◽  
pp. 29-34
Author(s):  
Anastasija Ignjatovska ◽  
◽  
Mite Tomov ◽  
◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Quality Improvement ◽  
Production Process ◽  
Process Parameters ◽  
Injection Molding Process ◽  
Molding Process ◽  
Control Stage ◽  
Molded Parts ◽  
Tolerance Field ◽  
Two Stages

Application of statistical methods in quality improvement of molded parts is presented in this paper. Implementation of two stages of DMAIC improvement cycle in a pre-production process is analysed in detail. DOE method is performed to define nominal values of process parameters of injection molding process. A fraction-factorial design with a single central point is used. A linear mathematical model with included elements of second-order interaction is defined. Finally, control stage is performed using prior defined nominal values. Process capability test is conducted in order to determine whether the process is capable of producing parts within specified tolerance field.

scholarly journals The nature of the change of the surface temperature of the workpiece during hot rolling of pipe steel

2018 ◽  
Vol 224 ◽  
pp. 01104 ◽  
Author(s):  
Vladimir Nekit ◽  
Sergey Platov ◽  
Maksim Krasnov
Keyword(s):  
Surface Temperature ◽  
Hot Rolling ◽  
Pipe Steel ◽  
Practical Importance ◽  
Experimental Studies ◽  
Phase Region ◽  
Work Piece ◽  
Two Phase ◽  
Deformation Processes ◽  
Two Stages

The article is devoted the experimental studies of deformation and temperature parameters of rolling the pipe steel on the rolling mill 5000 PJSC “MMK”. Knowledge of the regularities of the change in the surface temperature of work piece during hot rolling under the conditions of thermo mechanical deformation processes is of great theoretical and practical importance. The temperature conditions determine the energy and force parameters of rolling, as well as the mechanical properties and microstructure of the finished products. The experimental rolling was carried out in two stages: roughing at 6 passes at a temperature of 1050-900 ° C and finishing at 18-20 passes at a temperature below the start of the phase transformation of 900 ° C. The finishing rolling has been carried out in a two-phase region at the stage of polymorphic transformation in the steel. Significant differences in the nature of temperature changes at different stages of rolling are revealed.

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