Results 251 to 260 of about 120,634 (290)
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Optical Frequency Comb Generators for Trace Gas Sensing
Frontiers in Optics 2015, 2015Optical 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 +5 more
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Quantum cascade laser spectrometers for mobile trace-gas sensing
OSA High-brightness Sources and Light-driven Interactions Congress 2020 (EUVXRAY, HILAS, MICS), 2020Mid-IR spectroscopy using QCLs allows sensitive, selective, and fast detection of trace-gases. Recent developments permit rugged and lightweight instruments that create tantalizing options in environmental sciences and other fields, i.e. medicine or industrial process control.
Lukas Emmenegger +4 more
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Selectivity in trace gas sensing: recent developments, challenges, and future perspectives
The Analyst, 2022Selectivity 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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Integrated Mach-Zehnder micro-interferometer for gas trace remote sensing
SPIE Proceedings, 2006The realisation process and the preliminary tests on the performances of an integrated Mach-Zehnder Interferometer on LiNbO 3 (Lithium Niobate) substrate is presented. The microsystem has been obtained by using medium mass Ion Implantation on X-cut Lithium Niobate crystals.
Chiarini M +8 more
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Broadband Femtosecond Sources for Greenhouse Gas Spectroscopy and Trace-Gas Sensing
Renewable Energy and the Environment, 2011We 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.
Tyler Neely +4 more
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Widely Tunable Cr2+: ZnSe Laser Source for Trace-Gas Sensing
Advanced Solid-State Photonics, 2005A continuously tunable Cr2+:ZnSe laser is applied for photoacoustic gas detection in the wavelength range of 2.0-3.1 µm. Trace-gas measurements in the 2.6-3.1 µm range with ppb sensitivity are reported for the first time.
Evgeni Sorokin +3 more
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Perspectives of laser-photoacoustic spectroscopy in trace gas sensing
Journal de Physique IV (Proceedings), 2005Laser-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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Quartz‐Enhanced Photoacoustic Spectroscopy for Trace Gas Sensing
2021Photoacoustic spectroscopy (PAS) was established itself over the last decades as a powerful detection technique, capable of measuring trace gas concentrations at part‐per‐billion level. The basic principles of laser PAS are provided with a discussion on photoinduced acoustic wave generation and its detection. Quartz‐enhanced photoacoustic spectroscopy (
Patimisco, Pietro, Spagnolo, Vincenzo
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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), 2021Mid-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 +5 more
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Integrated pre-concentrator gas sensor system for improved trace gas sensing performance
2016 IEEE SENSORS, 2016An 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 +4 more
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