399 Hits in 9.9 sec

Ozone detection by differential absorption spectroscopy at ambient pressure with a 9.6�?m pulsed quantum-cascade laser

R. Jim�nez, M. Taslakov, F. Jeanneret, D. Hofstetter, M. Beck, J. Faist, V. Simeonov, B. Calpini, H. van den Bergh
2004 Applied physics B  
We report direct absorption spectroscopic detection of ozone at ambient pressure with a pulsed, DFB quantumcascade laser (QCL) tuned within 1044-1050 cm −1 by temperature scanning.  ...  The laser linewidth (∼ 0.13 cm −1 FWHM) was found to decrease with temperature, probably as a result of operation at constant current.  ...  ACKNOWLEDGEMENTS We gratefully acknowledge Alpes Lasers for kindly providing us with the QCL used in this investigation, particularly to A. Müller for his cooperation and valuable discussions.  ... 
doi:10.1007/s00340-003-1358-5 fatcat:47zvv6xtfvacjeosvts6kdl4x4

Diode laser absorption sensors for gas-dynamic and combustion flows

Mark G Allen
1998 Measurement science and technology  
Recent advances in room-temperature, near-IR and visible diode laser sources for telecommunication, high-speed computer networks, and optical data storage applications are enabling a new generation of  ...  gas dynamic and combustion flow sensors based on laser absorption spectroscopy.  ...  Sampling the combustion gases into a low-pressure, low-temperature cell eliminates many of the interference problems associated with in-situ measurements.  ... 
doi:10.1088/0957-0233/9/4/001 pmid:11543363 fatcat:zvlb6eolt5b35dqiw2np6u7l4u

Experimental research and CFD analysis of flow parameters in a SCR system for the original part and WALKER's replacement

2019 Combustion Engines  
as a measure of mixing degree, which have a significant impact on the design of the mixer and the SCR system.  ...  The next step was reverse engineering, which consisted in scanning the tested parts with a laser and processing their point cloud in Leios2 program.  ...  At the low exhaust gas temperature (before light-off) on the supercooled surfaces, tip of injector, mixer or inlet surface of monolith a liquid layer (wall film) of UWS crystallizes after evaporation of  ... 
doi:10.19206/ce-2019-402 fatcat:jc63mcohtvdolaklhofqxerv2q

A Benchmark for Lidar Sensors in Fog: Is Detection Breaking Down?

Mario Bijelic, Tobias Gruber, Werner Ritter
2018 2018 IEEE Intelligent Vehicles Symposium (IV)  
This is of great importance because most state of the art detection algorithms are based on undisturbed lidar data.  ...  Autonomous driving at level five does not only means self-driving in the sunshine. Adverse weather is especially critical because fog, rain, and snow degrade the perception of the environment.  ...  ACKNOWLEDGMENT The research leading to these results has received funding from the European Union under the H2020 ECSEL Programme as part of the DENSE project, contract number 692449.  ... 
doi:10.1109/ivs.2018.8500543 dblp:conf/ivs/BijelicGR18 fatcat:erbkio2wnzhzjbstxtbfz63h4u

Electro-Optical Techniques for Diesel Engine Research [chapter]

1977 Experimental Diagnostics in Gas Phase Combustion Systems  
The quality of the data in terms of the effects of the engine parameters will also be discussed.  ...  For this example, a temperature of 2,250~ and a pressure of 352 psi were assumed in a gas mixture of CH4 and combustion gases typical of diesel exhaust.  ...  should be focused on developing analytical techniques, and further refinement of the experimental capabilities should be minimized.  ... 
doi:10.2514/5.9781600865275.0629.0656 fatcat:nunaxqf5vrb6vhkjyxh3aep2rq

Experimental Study on Combustion Chamber Flow Field Using Positron Emission Tomography

Min Zhao, Hao Chen, Min Yao, Ruipeng Guo, Hui Xiao
2020 Journal of Chemical Engineering of Japan  
In this research, the uid imaging of a combustion chamber was obtained by Positron Emission Tomography (PET). In experiment, the chamber is constructed in PET scanner.  ...  The core idea is to observe the combustion process by means of nondestructive testing. A new combustion chamber detection method is explored through low cost and non-polluting nuclear imaging.  ...  Acknowledgement is research has been funded by the Natural Science Foundation of China (No. 62071229, No. 51875289 and No. 61873124  ... 
doi:10.1252/jcej.19we150 fatcat:3zlvblmxgvbhnp3da5idprb2ly

Synergistic Sensory Platform: Robotic Nurse

Igor Peshko, Romuald Pawluczyk, Dale Wick
2013 Journal of Low Power Electronics and Applications  
The analysis is focused on the structure of the robotic platform, sensory network and electronics and on the methods of the environment monitoring and data processing algorithms that provide maximal reliability  ...  The cross-use of data received from sensors of different types provides high reliability of the system.  ...  Some optical gas sensor basic principles of operation were developed by Igor Peshko during the time of his work at the University of Toronto, Department of Mechanical and Industrial Engineering, in cooperation  ... 
doi:10.3390/jlpea3020114 fatcat:4hp32gq7yfec3gsweg4n4tbdba

Experimental Investigation of the Influence of Combustor Cooling on the Characteristics of a FLOX©-Based Micro Gas Turbine Combustor [chapter]

Jan Zanger, Monz Thomas, Aigner Manfre
2013 Progress in Gas Turbine Performance  
Acknowledgements The financial support of this work by the EnBW Energie Baden-Württemberg AG and the German Federal Ministry of Economics and Technology is gratefully acknowledged.  ...  Author details Zanger Jan ⋆ , Monz Thomas and Aigner Manfred ⋆ Address all correspondence to: German Aerospace Center, Institute of Combustion Technology, Stuttgart, Germany  ...  However, the homogenising of the flame regions for the cooled combustor configuration seems to have no effect on exhaust gas emissions at low air numbers as shown in figure 10 and 11.  ... 
doi:10.5772/54405 fatcat:gicju62y2jcktoe4qcho42kxeu

XeNA: An automated 'open-source' 129Xe hyperpolarizer for clinical use

Panayiotis Nikolaou, Aaron M. Coffey, Laura L. Walkup, Brogan M. Gust, Nicholas Whiting, Hayley Newton, Iga Muradyan, Mikayel Dabaghyan, Kaili Ranta, Gregory D. Moroz, Matthew S. Rosen, Samuel Patz (+3 others)
2014 Magnetic Resonance Imaging  
The primary focus of this paper is on the technical / engineering development of the polarizer, with the explicit goals of facilitating the adaptation of design features and operative modes into other  ...  transport to a clinical 3 T scanner for MR spectroscopy and imaging as a prelude to in vivo experiments.  ...  Barcus for assistance during the early stages of polarizer construction. N.  ... 
doi:10.1016/j.mri.2014.02.002 pmid:24631715 pmcid:PMC4011489 fatcat:fj6rzj6ubrgnvocekgdci5zbpa

Lasers in combustion: From basic theory to practical devices

Jürgen Wolfrum
1998 Symposium (International) on Combustion  
Nonintrusive laser point and field measurements, especially joint velocity-scalar data at the same point in space and time, are of basic importance in the validation and further development of turbulent  ...  of temperatures and pressures.  ...  The generous support of our work by the Deutsche Forschungsgemeinschaft (SFB 123 and 359), the BMBF, the State of Baden-Wü rttemberg (TECFLAM), and the European Commission (JOULE) and many industrial companies  ... 
doi:10.1016/s0082-0784(98)80387-1 fatcat:ejn3iz3hafhqxf3lt2by5yqmlm

A review on glass welding by ultra-short laser pulses

Kristian Cvecek, Sarah Dehmel, Isamu Miyamoto, Michael Schmidt
2019 International Journal of Extreme Manufacturing  
Though the temperature reached during the process is on the order of a few 1000°C, the heat affected zone (HAZ) is confined to only tens of micrometers.  ...  In this work, we give an overview on the process, development and applications of glass welding by USP lasers.  ...  Acknowledgments The authors gratefully acknowledge support by the Graduate School in Advanced Optical Technologies (SAOT) of the Friedrich-Alexander-University of Erlangen-Nürnberg, and the Bayerisches  ... 
doi:10.1088/2631-7990/ab55f6 fatcat:c3ly4pj4mjekbj7sso5vmepr4e

3He spin exchange cells for magnetic resonance imaging

R. E. Jacob, S. W. Morgan, B. Saam
2002 Journal of Applied Physics  
The valved cells must hold of order 1 atm•L of gas at up to 15 atm pressure.  ...  Filling of cells with the requisite 3 He-N 2 mixture is done on an entirely separate gas-handling system.  ...  The other outlet of the tee is exhausted to room air through a flow meter and one-way pressure-relief valve.  ... 
doi:10.1063/1.1487438 fatcat:u3j5mk2elfdgznxc5mjcaldeai

Electron Accelerators for Research, Industry and Environment − the INCT Perspective [article]

Andrzej G. Chmielewski, Zbigniew Zimek
2019 Zenodo  
and more effective.  ...  This book is a result of work carried out under the Horizon 2020 ARIES project and concerns the development of new technologies to ensure that future accelerators will be more affordable, reliable, sustainable  ...  and Reactor Centre (SURRC) in darkness at ambient temperature with a relative humidity of 85%.  ... 
doi:10.5281/zenodo.3237553 fatcat:smhaeiblt5crbg5vzqpgjwayey

Use of portable FTIR spectrometers for detecting greenhouse gas emissions of the megacity Berlin – Part 1: Instrumental line shape characterisation and calibration of a quintuple of spectrometers

M. Frey, F. Hase, T. Blumenstock, J. Groß, M. Kiel, G. Mengistu Tsidu, K. Schäfer, M. Kumar Sha, J. Orphal
2015 Atmospheric Measurement Techniques Discussions  
Several low resolution spectrometers were used to investigate the CO<sub>2</sub> and CH<sub>4</sub> emissions of the megacity Berlin.  ...  Finally as a first result of the Berlin campaign we show the excellent agreement of ground pressure values obtained from total column measurements and in situ records.  ...  We acknowledge Friedrich Klappenbach from the "Institute for Meteorology and Climate Research -Atmospheric Trace Gases and Remote Sensing (IMK-ASF)" at the KIT for providing the fit parameters used for  ... 
doi:10.5194/amtd-8-2735-2015 fatcat:st6vws2vurcihjwxskukcc4dkm

Unmanned Aerial Systems for the Oil and Gas Industry: Overview, Applications and Challenges

Thumeera R. Wanasinghe, Raymond G. Gosine, Oscar De Silva, George K. I. Mann, Lesley Anne James, Peter Warrian
2020 IEEE Access  
ACKNOWLEDGEMENT The authors would like to thank Petroleum Research Newfoundland and Labrador (PRNL), Atlantic Canada Opportunities Agency (ACOA), Mitacs, University of Toronto's Munk School of Global Affairs  ...  and Public Policy, and Memorial University of Newfoundland for their financial and intellectual support to this research project.  ...  denied environments, unable to conduct contact tests, weather conditions (wind, light, ambient temperature) impact on the quality of the acquired data, limited capability for sense and avoidance, and  ... 
doi:10.1109/access.2020.3020593 fatcat:iqf4c3nrera7zbtsbfu3lsydje
« Previous Showing results 1 — 15 out of 399 results