Quantum cascade laser spectroscopic sensor for breath gas analysis

2018 ◽  
Author(s):  
Huiqi Tian ◽  
Luze Cao ◽  
Dong An ◽  
Tianbo He ◽  
Jingsong Li
Keyword(s):  
Quantum Cascade Laser ◽  
Gas Analysis ◽  
Quantum Cascade ◽  
Breath Gas Analysis ◽  
Laser Spectroscopic

scholarly journals Selective measurements of NO, NO<sub>2</sub> and NO<sub>y</sub> in the free troposphere using quantum cascade laser spectroscopy

2013 ◽  
Vol 6 (4) ◽  
pp. 927-936 ◽  
Author(s):  
B. Tuzson ◽  
K. Zeyer ◽  
M. Steinbacher ◽  
J. B. McManus ◽  
D. D. Nelson ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Dynamic Range ◽  
Gold Catalyst ◽  
Reactive Nitrogen ◽  
Monitoring Site ◽  
Quantum Cascade ◽  
Direct Measurements ◽  
Averaging Time ◽  
Laser Spectroscopic

Abstract. A quantum cascade laser based absorption spectrometer for continuous and direct measurements of NO and NO2 was employed at the high-altitude monitoring site Jungfraujoch (3580 m a.s.l., Switzerland) during a three-month campaign in spring/summer 2012. The total reactive nitrogen, NOy, was also measured in the form of NO after conversion on a gold catalyst. The aim was to assess the suitability of the instrument for long-term monitoring of the main reactive nitrogen species under predominantly free tropospheric air conditions. A precision (1σ) of 10 and 3 ppt for NO and NO2 was achieved under field conditions after 180 s averaging time. The linear dynamic range of the instrument has been verified for both species from the detection limit up to 45 ppb. The spectrometer shared a common sampling inlet with a chemiluminescence-based analyzer. The comparison of the time series shows excellent agreement between the two techniques and demonstrates the adequacy of the laser spectroscopic approach for this kind of demanding environmental applications.

scholarly journals Selective measurements of NO, NO<sub>2</sub> and NO<sub>y</sub> in the free troposphere using quantum cascade laser spectroscopy

2012 ◽  
Vol 5 (6) ◽  
pp. 8969-8993 ◽  
Author(s):  
B. Tuzson ◽  
K. Zeyer ◽  
M. Steinbacher ◽  
J. B. McManus ◽  
D. D. Nelson ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Dynamic Range ◽  
Gold Catalyst ◽  
Reactive Nitrogen ◽  
Monitoring Site ◽  
Quantum Cascade ◽  
Direct Measurements ◽  
Averaging Time ◽  
Laser Spectroscopic

Abstract. A quantum cascade laser based absorption spectrometer for continuous and direct measurements of NO and NO2 was employed at the high-altitude monitoring site Jungfraujoch (3580 m a.s.l., Switzerland) during a three month campaign in Spring/Summer 2012. The total reactive nitrogen, NOy, was also measured in the form of NO after conversion on a gold catalyst. The aim was to assess the suitability of the instrument for long-term monitoring of the main reactive nitrogen species under predominantly free tropospheric air conditions. A precision (1σ) of 10 and 3 ppt for NO and NO2 was achieved with 180 s averaging time under field conditions. The linear dynamic range of the instrument has been verified for both species from the detection limit to &amp;approx;45 ppbv. The spectrometer shared a common sampling inlet with a chemiluminescence-based analyzer. The comparison of the time series shows excellent agreement between the two techniques and demonstrates the adequacy of the laser spectroscopic approach for this kind of demanding environmental applications.

scholarly journals Molecular Laser Spectroscopy as a Tool for Gas Analysis Applications

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Javis Anyangwe Nwaboh ◽  
Thibault Desbois ◽  
Daniele Romanini ◽  
Detlef Schiel ◽  
Olav Werhahn
Keyword(s):  
Absorption Spectroscopy ◽  
Gas Analysis ◽  
Tunable Diode Laser ◽  
Spectroscopic Techniques ◽  
Laser Absorption Spectroscopy ◽  
Quantum Cascade ◽  
Laser Absorption ◽  
Fraction Measurement ◽  
Laser Spectroscopic ◽  
Diode Laser Absorption

We have used the traceable infrared laser spectrometric amount fraction measurement (TILSAM) method to perform absolute concentration measurements of molecular species using three laser spectroscopic techniques. We report results performed by tunable diode laser absorption spectroscopy (TDLAS), quantum cascade laser absorption spectroscopy (QCLAS), and cavity ring down spectroscopy (CRDS), all based on the TILSAM methodology. The measured results of the different spectroscopic techniques are in agreement with respective gravimetric values, showing that the TILSAM method is feasible with all different techniques. We emphasize the data quality objectives given by traceability issues and uncertainty analyses.

scholarly journals Multicomponent gas analysis using broadband quantum cascade laser spectroscopy

2014 ◽  
Vol 22 (15) ◽  
pp. 18299 ◽  
Author(s):  
A. Reyes-Reyes ◽  
Z. Hou ◽  
E. van Mastrigt ◽  
R. C. Horsten ◽  
J. C. de Jongste ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Quantum Cascade Laser ◽  
Gas Analysis ◽  
Quantum Cascade ◽  
Multicomponent Gas
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