Results 251 to 260 of about 16,868 (292)

Perspectives of laser-photoacoustic spectroscopy in trace gas sensing

Journal de Physique IV (Proceedings), 2005
Laser-based sensing techniques are attracting great interest in various fields of application, notably in trace gas monitoring and analysis. Among various detection schemes, photoacoustic monitoring offers some unique features. The performance of a laser-photoacoustic system crucially depends on the availability of appropriate laser sources, modulation
M. W. Sigrist, C. Fischer
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MIR Photoacoustic Trace Gas Sensing Using a Miniaturized 3D Printed Gas Cell

Advanced Photonics 2015, 2015
A miniaturized 3D printed photoacoustic trace gas sensor is presented, using a mid-infrared QCL at 5.26µm as excitation source. Its performance for sensing CH4 resulted in a normalized noise equivalent absorbance of 7.7·10-9cm-1WHz-½.
Bauer, Ralf, Wilson, David, Johnstone, Walter, Lengden, Michael   +3 more
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Enhanced trace NO2 gas sensing with functionalized graphene-based nanofibers

Sensors and Actuators B: Chemical
The development of trace nitrogen dioxide (NO2) gas sensors has recently garnered widespread attention. This interest arises not only from the demand for industrial production and environmental monitoring but, more importantly, due to the inherent health
Xueyan Li, Shasha Li, Wenle Pei, Sufang Song, Peng Li, Caixia Shi, Jinrong Wang, Zhuo Chen   +7 more
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Selectivity in trace gas sensing: recent developments, challenges, and future perspectives

The Analyst, 2022
Selectivity is one of the most crucial figures of merit in trace gas sensing, and thus a comprehensive assessment is necessary to have a clear picture of sensitivity, selectivity, and their interrelations in terms of quantitative and qualitative views.
Puspendu Barik, Manik Pradhan
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Broadband Femtosecond Sources for Greenhouse Gas Spectroscopy and Trace-Gas Sensing

Renewable Energy and the Environment, 2011
We describe several approaches for producing broadband femtosecond sources in the mid-infrared for applications in atmospheric spectroscopy. Using a 3.3 µm source, measurements of CH4 and H2O concentrations in atmospheric conditions are described.
Neely, Tyler, Johnson, Todd, Nugent-Glandorf, Lora, Adler, Florian, Diddams, Scott   +4 more
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Remote Sensing and Trace Gas Fluxes

1990
Most of the chapters in this volume emphasize the dynamics of energy, water, and carbon at the surface of the earth. These are major processes in the metabolism of the planet, and it is reasonable to expect that thermal and optical remote sensing could detect at least energy transformations rather directly.
Pamela A. Matson, Peter M. Vitousek
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Optical Frequency Comb Generators for Trace Gas Sensing

Frontiers in Optics 2015, 2015
Optical frequency comb generators for rapidly re-configurable trace gas sensing are demonstrated using high-bandwidth low-Vπ electro-optic modulators and rapid-scanning microwave sources. These compact devices perform sensitive dual-comb spectroscopy with user-defined line spacing.
Adam J. Fleisher, David A. Long, Joseph T. Hodges, Kevin O. Douglass, Stephen E. Maxwell, David F. Plusquellic   +5 more
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Low-power wireless trace gas sensing network

SPIE Proceedings, 2011
A basic wireless laser spectroscopic sensor network for monitoring of trace-gases will be presented. The prototype lowpower sensor nodes targeting carbon dioxide are based on tunable diode laser absorption spectroscopy and operate using a 2 μm VCSEL and a 3.5 m Herriott multi-pass cell.
Clinton J. Smith, Stephen So, Amir Khan, Mark A. Zondlo, Gerard Wysocki   +4 more
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Integrated pre-concentrator gas sensor system for improved trace gas sensing performance

2016 IEEE SENSORS, 2016
An integrated gas measurement system is presented which combines MEMS gas sensors with a micro gas pre-concentration device. Designed to increase gas sensor selectivity and sensitivity, the pre-concentrator samples gases and releases them by thermal desorption.
Martin Leidinger, Tilman Sauerwald, Andreas Schütze, Christine Alepee, Max Rieger   +4 more
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Up in the air! Trace-gas sensing aboard flying platforms

2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2021
Mid-infrared laser spectroscopy is a proven technology for reliable and high-precision gas sensing. With the advent of state-of-the-art laser sources, a large variety of analytical techniques has been developed, significantly extending the area of applications beyond the laboratory environment.
Bela Tuzson, Manuel Graf, Philipp Scheidegger, Herbert Looser, Andre Kupferschmid, Lukas Emmenegger   +5 more
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