Investigations of processing parameters of thermal poling optical fibers using an in situ testing system

2005 ◽  
Author(s):  
Zhe Chen ◽  
Peifan Jiang
Keyword(s):  
Optical Fibers ◽  
Processing Parameters ◽  
Testing System ◽  
In Situ Testing ◽  
Thermal Poling

Real-Time Investigation of Thermal Poling Process in Optic Fiber

2013 ◽  
Vol 321-324 ◽  
pp. 453-459
Author(s):  
Jian He ◽  
Zhe Chen ◽  
Yun Han Luo
Keyword(s):  
Real Time ◽  
Optical Fibers ◽  
Processing Parameters ◽  
Test System ◽  
Fused Silica ◽  
Thermal Poling ◽  
Poling Process ◽  
High Voltage Breakdown ◽  
Time Test ◽  
Poling Voltage

Thermal poling could make centrosymmetric fused silica optical fibers generate second-order nonlinearity effect and linear electooptic effect. In order to investigate the influence of thermal poling parameters on linear electooptic effect, a real-time test system, which mainly consists of an all polarization maintaining fiber Mach-Zehnder interferometer, has been utilized to monitor the whole thermal poling process in fibers. The processing parameters in thermal poling, such as applied poling voltage, poling duration and temperature, have been measured in real time. Based on those measurements, their influence on the linear electrooptic effect has been discussed. Experiment results show that the linear electrooptic coefficient would increase when a stronger electric field is applied on fibers. Considering the anti-high-voltage breakdown capability of fibers, a DC voltage from 3KV to 4KV is suitable for polarization in thermal poling. When using 3KV, the optimum poling duration is about 16 minutes and the best temperature for thermal poling is around 190°C. Keywords: electro-optic effect, poled fiber, thermal poling, real time test system, fiber optic interferometer

scholarly journals Influence of cure parameters in polymer matrix composites using embedded optical fibers

2020 ◽  
Vol 54 (19) ◽  
pp. 2611-2621
Author(s):  
Daniel A Drake ◽  
Rani W Sullivan ◽  
Jonathan E Spowart ◽  
Katie Thorp
Keyword(s):  
Optical Fibers ◽  
Composite Laminates ◽  
Composite Structures ◽  
Polymer Matrix Composites ◽  
Processing Parameters ◽  
Internal Strain ◽  
Matrix Composites ◽  
Molding Process

The influence of cure processing parameters was investigated using strain distributions from embedded optical fibers. The determination of optimized cure parameters is often needed to achieve material properties which meet aerospace industry design requirements. Optical fibers were embedded near the midplane of thin (5 mm; [0/90/90/0]3s) composite laminates to monitor the internal strain during cure for two different cure cycles (manufacturer-recommended and an alternative two-step cure). Each laminate was fabricated using a vacuum-assisted resin transfer molding process. The internal strain with respect to the spatial position and time were monitored. During cure, greater variations in the strain near the vicinity of the laminate edges were observed. However, a two-step cure cycle revealed that the variation of strain near the laminate edges is reduced. The results demonstrate the capability of high-spatial resolution optical fibers to measure the in-situ cure and residual strain during the processing of composite structures.

scholarly journals Simulation on following Performance of High-Speed Railway In Situ Testing System

2013 ◽  
Vol 5 ◽  
pp. 679603
Author(s):  
Fei-Long Zheng ◽  
Liang-Cai Zeng ◽  
Xin-Yuan Chen
Keyword(s):  
High Speed ◽  
Testing System ◽  
In Situ Testing ◽  
High Speed Railway

In Situ Thermal-Mechanical Fatigue Testing of Thin Au Lines

2007 ◽  
Vol 353-358 ◽  
pp. 2916-2919
Author(s):  
G.P. Zhang ◽  
Bin Zhang ◽  
Q.Y. Yu ◽  
J. Tan
Keyword(s):  
Fatigue Damage ◽  
Focused Ion Beam ◽  
Fatigue Testing ◽  
Ion Beam ◽  
Testing System ◽  
In Situ Testing ◽  
Thermal Mechanical Fatigue ◽  
Mechanical Fatigue ◽  
Dual Beam

An in-situ testing system for thermal-mechanical fatigue of thin metal lines was setup inside a dual-beam focused ion beam (FIB)/scanning electron microscope (SEM) system. Alternating currents (AC) were applied to narrow Au lines 200-nm-thick through nanomanipulator needles. Preliminary results show that severe thermal-mechanical fatigue damage can be generated by the action of the applied AC. The in-situ recording of the evolution of the damage has been carried out and the possible mechanism of the thermal-mechanical fatigue damage in the Au lines resulted from the joule heating was discussed.

Design of the in-situ testing system for the accelerated life test of the space infrared device

2013 ◽  
Author(s):  
Xianliang Zhu ◽  
Haiyan Zhang ◽  
Yang Wang ◽  
Xiangrong He ◽  
Haimei Gong
Keyword(s):  
Accelerated Life Test ◽  
Testing System ◽  
In Situ Testing ◽  
Life Test ◽  
Accelerated Life

A geometallurgical characterization study of the Crystalkop Reef at the Great Noligwa Mine, Klerksdorp Goldfield, South Africa

2017 ◽  
Vol 120 (3) ◽  
pp. 303-322
Author(s):  
D. Pienaar ◽  
B.M. Guy ◽  
C. Pienaar ◽  
K.S. Viljoen
Keyword(s):  
South Africa ◽  
Treatment Plant ◽  
Processing Parameters ◽  
Processing Plant ◽  
Small Contribution ◽  
Gold Cyanide ◽  
Three Samples ◽  
Characterization Study ◽  
Different Sources

Abstract Mineralogical and textural variability of ores from different sources commonly leads to processing inefficiencies, particularly when a processing plant is designed to treat ore from a single source (i.e. ore of a relatively uniform composition). The bulk of the Witwatersrand ore in the Klerksdorp goldfield, processed at the AngloGold Ashanti Great Noligwa treatment plant, is derived from the Vaal Reef (>90%), with a comparatively small contribution obtained from the Crystalkop Reef (or C-Reef). Despite the uneven contribution, it is of critical importance to ensure that the processing parameters are optimized for the treatment of both the Vaal and C-Reefs. This paper serves to document the results of a geometallurgical study of the C-Reef at the Great Noligwa gold mine in the Klerksdorp goldfield of South Africa, with the primary aim of assessing the suitability of the processing parameters that are in use at the Great Noligwa plant. The paper also draws comparisons between the C-Reef and the Vaal Reef A-facies (Vaal Reef) and attempts to explain minor differences in the recovery of gold and uranium from these two sources. Three samples of the C-Reef were collected in-situ from the underground operations at Great Noligwa mine for mineralogical analyses and metallurgical tests. Laboratory-scale leach tests for gold (cyanide) and uranium (sulphuric acid) were carried out using dissolution conditions similar to that in use at the Great Noligwa plant, followed by further diagnostic leaching in the case of gold. The gold in the ore was found to be readily leachable with recoveries ranging from 95% to 97% (as opposed to 89% to 93% for the Vaal Reef). Additional recoveries were achieved in the presence of excess cyanide (96% to 98%). The recovery of uranium varied between 72% and 76% (as opposed to 30% to 64% for the Vaal Reef), which is substantially higher than predicted, given the amount of brannerite in the ore, which is generally regarded as refractory. Thus, the higher uranium recoveries from the C-Reef imply that a proportion of the uranium was recovered by the partial dissolution of brannerite. As the Vaal Reef contain high amounts of chlorite (3% to 8%), which is an important acid consumer, it is considered likely that this could have reduced the effectiveness of the H2SO4 leach in the case of the ore of the Vaal Reef. Since the gold and uranium recoveries from the C-Reef were higher than the recoveries from the Vaal Reef, the results demonstrate that the processing parameters used for treatment of the Vaal Reef are equally suited to the treatment of the C-Reef. Moreover, small processing modifications, such as increased milling and leach retention times, may well increase the recovery of gold (particularly when e.g. coarse gold, or unexposed gold, is present).

scholarly journals Review: Filament Winding and Automated Fiber Placement with In Situ Consolidation for Fiber Reinforced Thermoplastic Polymer Composites

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1951
Author(s):  
Yi Di Boon ◽  
Sunil Chandrakant Joshi ◽  
Somen Kumar Bhudolia
Keyword(s):  
Processing Parameters ◽  
Filament Winding ◽  
Reference Points ◽  
Thermoplastic Composites ◽  
Manufacturing Processes ◽  
Fiber Reinforced ◽  
Consolidation Process ◽  
Fiber Placement ◽  
Automated Fiber Placement

Fiber reinforced thermoplastic composites are gaining popularity in many industries due to their short consolidation cycles, among other advantages over thermoset-based composites. Computer aided manufacturing processes, such as filament winding and automated fiber placement, have been used conventionally for thermoset-based composites. The automated processes can be adapted to include in situ consolidation for the fabrication of thermoplastic-based composites. In this paper, a detailed literature review on the factors affecting the in situ consolidation process is presented. The models used to study the various aspects of the in situ consolidation process are discussed. The processing parameters that gave good consolidation results in past studies are compiled and highlighted. The parameters can be used as reference points for future studies to further improve the automated manufacturing processes.

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