Results 61 to 70 of about 16,868 (292)

Improvement of the Detection Sensitivity for Tunable Diode Laser Absorption Spectroscopy: A Review

Frontiers in Physics, 2022
Tunable Diode Laser Absorption Spectroscopy (TDLAS), a trace gas sensing technology based on infrared absorption spectroscopy, has been developed rapidly in the past few decades.
Shan Lin, Shan Lin, Jun Chang, Jiachen Sun, Peng Xu   +4 more
doaj   +1 more source

Cylindrical multipass reflection cells for optical trace gas sensing [PDF]

CLEO: 2015, 2015
Single-piece cylindrical multipass cells effectively fold a long optical path in a small detection volume. We present a systematic survey of various cell configurations and the respective mirror shapes for enhanced path-to-volume ratios.
Markus Mangold, Herbert Looser, Béla Tuzson, Lukas Emmenegger   +3 more
openaire   +1 more source

Extraordinary evanescent field confinement waveguide sensor for mid-infrared trace gas spectroscopy [PDF]

, 2021
Nanophotonic waveguides are at the core of a great variety of optical sensors. These structures confine light along defined paths on photonic chips and provide light–matter interaction via an evanescent field.
Murugan, Ganapathy Senthil, Datta, Anurup, Alberti, Sebastián, Yallew, Henock Demessie, Jagerska, Jana, Vlk, Marek, Mittal, Vinita   +6 more
core   +1 more source

Influence of Test Temperature and Test Frequency on Fatigue Life of Aluminum Alloy EN AW‐2618A

Advanced Engineering Materials, EarlyView.
The influence of test temperature and test frequency on the fatigue life of EN AW‐2618A is investigated. High‐cycle fatigue tests are performed at different test temperatures and frequencies on the 1000 h/230°C overaged state. Both test parameters reduce fatigue life due to time‐dependent damage mechanisms.
Ying Han, Julian M. Rosalie, Jan Radners, Mauro Madia, Philipp von Hartrott, Birgit Skrotzki   +5 more
wiley   +1 more source

Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites

Advanced Engineering Materials, EarlyView.
Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter, Andreas Bezold, Johan Westraadt, Katharina Fiegl, Subham Chattoraj, Benjamin Wahlmann, Carolin Körner, Michael Mills, Mathias Göken, Steffen Neumeier   +9 more
wiley   +1 more source

A Miniaturized 3D-Printed Quartz-Enhanced Photoacoustic Spectroscopy Sensor for Methane Detection with a High-Power Diode Laser

Sensors, 2023
In this invited paper, a highly sensitive methane (CH4) trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) technique using a high-power diode laser and a miniaturized 3D-printed acoustic detection unit (ADU) is demonstrated for ...
Yanjun Chen, Tiantian Liang, Shunda Qiao, Yufei Ma   +3 more
doaj   +1 more source

Improving the Detection Limit in a Capillary Raman System for In Situ Gas Analysis by Means of Fluorescence Reduction

Sensors, 2015
Raman spectroscopy for low-pressure or trace gas analysis is rather challenging, in particular in process control applications requiring trace detection and real-time response; in general, enhancement techniques are required.
Simone Rupp, Andreas Off, Hendrik Seitz-Moskaliuk, Timothy M. James, Helmut H. Telle   +4 more
doaj   +1 more source

Recycling of NiTi Shape Memory Alloys: Fundamental and Technological Aspects of a Vacuum Induction Melting Processing Route

Advanced Engineering Materials, EarlyView.
The present study investigates recycling of NiTi shape memory alloys via vacuum induction melting. An ingot was synthesized from elemental Ni and Ti and subjected to three subsequent remelting cycles. Remelting increases process durations and impurity levels and adversely affects microstructures and functional properties.
Sakia Sophia Noorzayee, Son Tung Mai, Sarath Menon, Braulio Gadiel Sánchez Ortega, Ralf Drautz, Alexander Kauffmann, Gunther Eggeler, Jan Frenzel   +7 more
wiley   +1 more source

Development of dynamic gas generation system for ultratrace amounts of acetone at parts-per-trillion levels with low temperature permeation method

Discover Applied Sciences
Different types of gas sensing devices have been developed to monitor trace amounts of volatile compounds emitted from exhalation, human skin, building materials, and atmospheric chemical reactions, etc.. In particular, the recent progress in transdermal
Reiji Aoyagi, Takahiro Arakawa, Kenta Iitani, Kohji Mitsubayashi, Yoshika Sekine, Yuichiro Kaifuku   +5 more
doaj   +1 more source

Condition monitoring of an advanced gas-cooled nuclear reactor core

, 2007
A critical component of an advanced gas-cooled reactor station is the graphite core. As a station ages, the graphite bricks that comprise the core can distort and may eventually crack.
Giovanini, L., Grimble, M.J., Monari, M., Pang, Y.   +3 more
core   +1 more source