Results 271 to 280 of about 276,908 (308)

Integrated Mach-Zehnder micro-interferometer for gas trace remote sensing

SPIE Proceedings, 2006
The 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, Bentini GG, Bianconi M, Cerutti A, Pennestrì G, Pengfei Wang, Lin She, Mazzoldi P, Sada C   +8 more
openaire   +5 more sources

Template-free synthesis of wafer-sized polyaniline nanoscale film with high electrical conductivity for trace ammonia gas sensing

Journal of Materials Chemistry A, 2022
Ammonia gas, as an air pollutant, chemical raw material, and a marker of kidney disease and explosive, widely exists in our daily life.
Chonghui Zhu, Xin Dong, Chuanyu Guo, L. Huo, Shan Gao, Zhikun Zheng, Xiao-li Cheng, Yingming Xu   +7 more
semanticscholar   +1 more source

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.
Tyler Neely, Todd Johnson, Lora Nugent-Glandorf, Florian Adler, Scott Diddams   +4 more
openaire   +1 more source

Widely Tunable Cr2+: ZnSe Laser Source for Trace-Gas Sensing

Advanced Solid-State Photonics, 2005
A 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, Irina T. Sorokina, Cornelia Fischer, Markus W. Sigrist   +3 more
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Damping Mechanisms of Piezoelectric Quartz Tuning Forks Employed in Photoacoustic Spectroscopy for Trace Gas Sensing

Physica Status Solidi (a), 2019
A study of the dependence of main loss mechanisms on the geometry of piezoelectric quartz tuning forks (QTFs) is reported. The influence of these loss mechanisms on the quality factor Q occurring while the QTF vibrates at the in‐plane flexural ...
M. Giglio, G. Menduni, P. Patimisco, A. Sampaolo, A. Elefante, V. Passaro, V. Spagnolo   +6 more
semanticscholar   +1 more source

Trace gas sensing using diode-pumped collinearly detected spontaneous Raman scattering enhanced by a multipass cell

, 2019
A simple but highly effective method for enhancement of spontaneous Raman scattering from gases is described. It employs a multimode blue laser diode that receives feedback from a near-concentric bidirectional multipass cavity in such a way as to ...
J. G. Velez, A. Muller
semanticscholar   +1 more source

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 Schutze, Christine Alepee, Max Rieger   +4 more
openaire   +1 more source

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
openaire   +2 more sources