Application of quantum cascade lasers to high-precision atmospheric trace gas measurements

2010 ◽  
Vol 49 (11) ◽  
pp. 111124 ◽  
Author(s):  
J. Barry McManus
Keyword(s):  
High Precision ◽  
Quantum Cascade Lasers ◽  
Trace Gas ◽  
Quantum Cascade ◽  
Gas Measurements ◽  
Atmospheric Trace Gas ◽  
Cascade Lasers

Applications of quantum cascade lasers for sensitive trace gas measurements of CO, CH4, N2O and HCHO

2008 ◽  
Vol 92 (3) ◽  
pp. 419-430 ◽  
Author(s):  
C.L. Schiller ◽  
H. Bozem ◽  
C. Gurk ◽  
U. Parchatka ◽  
R. Königstedt ◽  
...  
Keyword(s):  
Quantum Cascade Lasers ◽  
Trace Gas ◽  
Quantum Cascade ◽  
Gas Measurements ◽  
Cascade Lasers

Trace gas measurements using optically resonant cavities and quantum cascade lasers operating at room temperature

2008 ◽  
Vol 104 (9) ◽  
pp. 093115 ◽  
Author(s):  
S. Welzel ◽  
G. Lombardi ◽  
P. B. Davies ◽  
R. Engeln ◽  
D. C. Schram ◽  
...  
Keyword(s):  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Trace Gas ◽  
Resonant Cavities ◽  
Quantum Cascade ◽  
Gas Measurements ◽  
Cascade Lasers

Photoacoustic spectroscopy for trace gas detection with cryogenic and room-temperature continuous-wave quantum cascade lasers

Open Physics ◽  
2010 ◽  
Vol 8 (2) ◽  
Author(s):  
Virginie Zeninari ◽  
Agnès Grossel ◽  
Lilian Joly ◽  
Thomas Decarpenterie ◽  
Bruno Grouiez ◽  
...  
Keyword(s):  
Detection Limit ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Gas Detection ◽  
Trace Gas ◽  
Atmospheric Gases ◽  
Trace Gas Detection ◽  
Quantum Cascade ◽  
Cascade Lasers

AbstractThe main characteristics that a sensor must possess for trace gas detection and pollution monitoring are high sensitivity, high selectivity and the capability to perform in situ measurements. The photacoustic Helmholtz sensor developed in Reims, used in conjunction with powerful Quantum Cascade Lasers (QCLs), fulfils all these requirements. The best cell response is # 1200 V W−1 cm and the corresponding ultimate sensitivity is j 3.3 × 10−10 W cm−11 Hz−11/2. This efficient sensor is used with mid-infrared QCLs from Alpes Lasers to reach the strong fundamental absorption bands of some atmospheric gases. A first cryogenic QCL emitting at 7.9 μm demonstrates the detection of methane in air with a detection limit of 3 ppb. A detection limit of 20 ppb of NO in air is demonstrated using another cryogenic QCL emitting in the 5.4 μm region. Real in-situ measurements can be achieved only with room-temperature QCLs. A room-temperature QCL emitting in the 7.9 μm region demonstrates the simultaneous detection of methane and nitrous oxide in air (17 and 7 ppb detection limit, respectively). All these reliable measurements allow the estimated detection limit for various atmospheric gases using quantum cascade lasers to be obtained. Each gas absorbing in the infrared may be detected at a detection limit in the ppb or low-ppb range.

Application of quantum cascade lasers to trace gas analysis

2007 ◽  
Vol 90 (2) ◽  
pp. 165-176 ◽  
Author(s):  
A. Kosterev ◽  
G. Wysocki ◽  
Y. Bakhirkin ◽  
S. So ◽  
R. Lewicki ◽  
...  
Keyword(s):  
Quantum Cascade Lasers ◽  
Gas Analysis ◽  
Trace Gas ◽  
Quantum Cascade ◽  
Trace Gas Analysis ◽  
Cascade Lasers

scholarly journals Investigation of adsorption and desorption behavior of small-volume cylinders and its relevance for atmospheric trace gas analysis

2020 ◽  
Vol 13 (1) ◽  
pp. 101-117 ◽  
Author(s):  
Ece Satar ◽  
Peter Nyfeler ◽  
Bernhard Bereiter ◽  
Céline Pascale ◽  
Bernhard Niederhauser ◽  
...  
Keyword(s):  
Small Volume ◽  
Gas Analysis ◽  
Trace Gas ◽  
Steel Cylinder ◽  
Adsorption And Desorption ◽  
Quantum Cascade ◽  
Aluminum Cylinder ◽  
Gas Measurements ◽  
Spectrometer System ◽  
Atmospheric Trace Gas

Abstract. Atmospheric trace gas measurements of greenhouse gases are critical in their precision and accuracy. In the past 5 years, atmospheric measurement and gas metrology communities have turned their attention to possible surface effects due to pressure and temperature variations during a standard cylinder's lifetime. This study concentrates on this issue by introducing newly built small-volume aluminum and steel cylinders which enable the investigation of trace gases and their affinity for adsorption and desorption on various surfaces over a set of temperature and pressure ranges. The presented experiments are designed to test the filling pressure dependencies up to 30 bar and temperature dependencies from −10 ∘C up to 180 ∘C for these prototype cylinders. We present measurements of CO2, CH4, CO and H2O using a cavity ring-down spectroscopy analyzer under these conditions. Moreover, we investigated CO2 amount fractions using a novel quantum cascade laser spectrometer system enabling measurements at pressures as a low as 5 mbar. This extensive dataset revealed that for absolute pressures down to 150 mbar the enhancement in the amount fraction of CO2 relative to its initial value (at 1200 mbar absolute) is limited to 0.12 µmol mol−1 for the prototype aluminum cylinder. Up to 80 ∘C, the aluminum cylinder showed superior results and less response to varying temperature compared to the steel cylinder. For CO2, these changes were insignificant at 80 ∘C for the aluminum cylinder, whereas a 0.11 µmol mol−1 enhancement for the steel cylinder was observed. High-temperature experiments showed that for both cylinders irreversible temperature effects occur especially above 130 ∘C.

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