Results 101 to 110 of about 197,759 (301)

Integrated optics technology study [PDF]

The status and near term potential of materials and processes available for the fabrication of single mode integrated electro-optical components are discussed.
Chen, B., Findakly, T., Innarella, R.
core   +1 more source

Predicting macrobending loss for large-mode area photonic crystal fibers

, 2004
We report on an easy-to-evaluate expression for the prediction of the bend-loss for a large mode area photonic crystal fiber (PCF) with a triangular air-hole lattice. The expression is based on a recently proposed formulation of the V-parameter for a PCF
Albertsen, M., Bjarklev, A., Bonacinni, D., Folkenberg, J. R., Mortensen, N. A., Nielsen, M. D.   +5 more
core   +1 more source

Thermomechanical Fatigue and Creep–Fatigue Interaction of Inconel 718 Additively Manufactured by Laser Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth, Tomáš Babinský, Jan Lars Riedel, Wen Hao Kan, Aijun Huang, Martin Heilmaier, Ivo Šulák   +6 more
wiley   +1 more source

Modified Decision Feedback Equalizers for Nonlinearity Compensation in Coherent PAM4 Transmission System

Photonics
To address chromatic dispersion (CD) and nonlinear impairments in coherent optical four-level pulse amplitude modulation (PAM4) systems, we propose a magnitude-assisted decision feedback equalizer (MA-DFE).
Zhengxuan Li, Zheng Xin, Siyu Luo, Acai Tan, Bingyao Cao   +4 more
doaj   +1 more source

True Phase Measurement of Distributed Vibration Sensors Based on Heterodyne $\varphi $-OTDR

IEEE Photonics Journal, 2018
We demonstrate a method to truly measure the phase change originated from external vibration by heterodyne phase-sensitive optical time-domain reflectometer ($\varphi $ -OTDR).
Huanhuan Liu, Fufei Pang, Longbao Lv, Xuanwei Mei, Yingxiong Song, Jian Chen, Tingyun Wang   +6 more
doaj   +1 more source

Effect of Laser Deoxidation on Adhesive‐Bonded Aluminum in an Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
This study investigates laser ablation of aluminum under oxygen‐free conditions. The goal is to produce oxide‐free substrates that enable improved adhesive bonding with epoxy. Optimized laser parameters (90% overlap, 300 µJ) combined with oxide‐free substrates result in the highest tensile strength of the adhesive bond.
Sandra Gerland, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Ludger Overmeyer, Annika Raatz   +5 more
wiley   +1 more source

Closed-circuit television welding- electrode guidance system [PDF]

, 1974
Closed-circuit TV camera is mounted parallel to electrode and moves along with it. Camera is scanned along seam so seam is viewed parallel with scan lines on TV monitor.
Avery, R. M., Smith, H. E., Stephens, D. L., Taylor, R. A., Wall, W. A., Wunsch, H. P.   +5 more
core   +1 more source

Sol–Gel Derived Polymer Precursors for Stereolithography of ZrC

Advanced Engineering Materials, EarlyView.
ZrC is a critical material target for extreme temperature conditions. This report describes a protocol for preparing ZrC ceramics via stereolithography and examines the impact of the polymer matrix on carbothermal reduction and mechanical stability of 3D printed ZrC.
Charles J. Rafalko, Evelyn Wang, Michael A. Hickner   +2 more
wiley   +1 more source

Speed-Adaptive PI Collection and PP Adjustment in Indoor VLC Network

Photonics
In this paper, a novel adjustment algorithm of the position-predicted period (PP) in an indoor visible light communication (VLC) network is proposed. The algorithm is adaptive to the movement speed.
Yixin Chen, Guiyu Gong, Xiaoqi Wang, Chaoqin Gan, Shibao Wu   +4 more
doaj   +1 more source

Fiber optics for aircraft engine/inlet control [PDF]

NASA programs that focus on the use of fiber optics for aircraft engine/inlet control are reviewed. Fiber optics for aircraft control is attractive because of its inherent immunity to EMI and RFI noise.
Baumbick, R. J.
core   +1 more source