Results 261 to 270 of about 120,634 (290)

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

Fiber-ring laser-based intracavity photoacoustic spectroscopy for trace gas sensing

Optics Letters, 2017
We demonstrated a novel trace gas sensing method based on fiber-ring laser intracavity photoacoustic spectroscopy. This spectroscopic technique is a merging of photoacoustic spectroscopy (PAS) with a fiber-ring cavity for sensitive and all-fiber gas detection.
Qiang, Wang, Zhen, Wang, Jun, Chang, Wei, Ren   +3 more
openaire   +2 more sources

Ultrabroadband Solid-State Lasers in Trace Gas Sensing

2008
Application of ultrabroadband Cr2+-doped mid-infrared lasers to sensitive molecular spectroscopy in the 2–3 μm wavelength range is demonstrated using two different techniques: scanning photoacoustic spectroscopy and intracavity absorption spectroscopy.
openaire   +1 more source

Trace gas sensing using quantum cascade lasers and optoacoustic detection

SPIE Proceedings, 2009
We report on the realization of a optoacoustic sensor based on mid-infrared quantum-cascade lasers (QCLs) for the detection of nitric oxide (NO) and formaldehyde (CH(2)O). A resonant photoacoustic cell equipped with 4 electret microphones was excited in its first longitudinal mode by the modulated laser light. A detection limit for of 300 parts in 10(9)
Spagnolo Vincenzo, Elia Angela, Di Franco Cinzia, Lugara Pietro Mario, Vitiello Miriam S, Scamarcio Gaetano   +5 more
openaire   +4 more sources

Remote optical trace gas sensing over existing telecommunication access network

2016 Photonics North (PN), 2016
We propose an optical remote trace gas sensing network directly overlaid onto optical access network using direct laser absorption spectroscopy (DLAS), which provides a real-time, low cost, and maintenance-free solution.
null Ting Wang, null Yi Weng, null Jing Han, null Lianfa Bai   +3 more
openaire   +1 more source

GASCOSCAN and GASCOFIL-Remote Sensing Gas Correlation Spectrometers for Tropospheric Trace Gas Measurements

Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques, 1987
Correlation spectroscopy, which is a powerful diagnostic tool for the determination and monitoring of trace atmospheric contaminants, involves a correlative comparison between the features of a "field spectrum" of a specific region of the atmosphere, and the features of a "mask function" which is representative of the spectral absorption features of ...
W. H. Morrow, R. W. Nicholls
openaire   +1 more source

Environmental and industrial trace gas sensing using quantum cascade lasers

Optical Sensors and Sensing Congress (ES, FTS, HISE, Sensors), 2019
Mid-IR spectroscopy using QCLs allows sensitive, selective, and fast detection of trace gases. Recent developments, including dual-wavelength QCLs, create tantalizing options for compact, multi-species analysis in industrial and environmental applications.
Lukas Emmenegger, Morten Hundt, Manuel Graf, Philipp Scheidegger, Herbert Looser, Béla Tuzson   +5 more
openaire   +1 more source

Photoacoustic trace gas sensing with mid-IR quantum cascade lasers

2009 3rd International Workshop on Advances in sensors and Interfaces, 2009
We report on the realization of an optoacoustic sensor based on mid-infrared quantum-cascade lasers (QCLs) for the detection of nitric oxide (NO) and formaldehyde (CH(2)O). A resonant photoacoustic cell equipped with 4 electret microphones was excited in its first longitudinal mode by the modulated laser light.
Elia, A., SPAGNOLO, Vincenzo Luigi, Franco, C. D., Lugará, P. M., Scamarcio, G.   +4 more
openaire   +3 more sources

Applications of Supercontinuum Sources for Trace Gas Sensing

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Jahromi, K.E., Khodabakhsh, A., Cristescu, S.M., Harren, F.J.M.   +3 more
openaire   +1 more source

[Remote sensing of atmospheric trace gas by airborne passive FTIR].

Guang pu xue yu guang pu fen xi = Guang pu, 2010
The present article describes the details of aviatic measurement for remote sensing trace gases in atmosphere under various surface backgrounds with airborne passive FTIR. The passive down viewing and remote sensing technique used in the experiment is discussed.
Min-quang, Gao, Wen-qing, Liu, Tian-shu, Zhang, Jian-guo, Liu, Yi-huai, Lu, Ya-ping, Wang, Liang, Xu, Jun, Zhu, Jun, Chen   +8 more
openaire   +1 more source