Measurement of the Rate of Hydrogen Peroxide Thermal Decomposition in a Shock Tube Using Quantum Cascade Laser Absorption Near 7.7 μm

2013 ◽  
Vol 46 (5) ◽  
pp. 275-284 ◽  
Author(s):  
M. B. Sajid ◽  
Et. Es-sebbar ◽  
T. Javed ◽  
C. Fittschen ◽  
A. Farooq
Keyword(s):  
Hydrogen Peroxide ◽  
Thermal Decomposition ◽  
Shock Tube ◽  
Quantum Cascade Laser ◽  
Quantum Cascade ◽  
Laser Absorption

Quantum cascade laser absorption sensor for carbon monoxide in high-pressure gases using wavelength modulation spectroscopy

2014 ◽  
Vol 53 (9) ◽  
pp. 1938 ◽  
Author(s):  
R. M. Spearrin ◽  
C. S. Goldenstein ◽  
J. B. Jeffries ◽  
R. K. Hanson
Keyword(s):  
Carbon Monoxide ◽  
High Pressure ◽  
Quantum Cascade Laser ◽  
Wavelength Modulation Spectroscopy ◽  
Wavelength Modulation ◽  
Modulation Spectroscopy ◽  
Quantum Cascade ◽  
Laser Absorption

In-situdiagnostics of hydrocarbon dusty plasmas using quantum cascade laser absorption spectroscopy and mass spectrometry

2014 ◽  
Vol 80 (6) ◽  
pp. 833-841 ◽  
Author(s):  
K. Ouaras ◽  
L. Colina Delacqua ◽  
G. Lombardi ◽  
J. Röpcke ◽  
M. Wartel ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Quantum Cascade Laser ◽  
Negative Ions ◽  
Dusty Plasmas ◽  
Qualitative Comparison ◽  
Quantum Cascade ◽  
Laser Absorption ◽  
Electrostatic Probe ◽  
Probe Measurements ◽  
Reaction Characteristic

The formation of carbon nanoparticles in low pressure magnetized H2/CH4and H2/C2H2plasmas is investigated using infrared quantum cascade laser absorption, mass spectrometry, and electrostatic probe measurements. Results showed that dust formation is correlated to the presence of a significant amount of large positively charged hydrocarbon ions. Large negative ions or neutral hydrocarbon were not observed. These results, along with a qualitative comparison of diffusion and reaction characteristic, suggest that a positive ion may contribute to the growth of nanoparticles in hydrocarbon magnetized plasmas.

Quantum-cascade laser absorption spectroscopy for balloon-borne measurements of stratospheric H2O

2021 ◽  
Author(s):  
Simone Brunamonti ◽  
Manuel Graf ◽  
Lukas Emmenegger ◽  
Béla Tuzson
Keyword(s):  
Global Warming ◽  
Absorption Spectroscopy ◽  
Quantum Cascade Laser ◽  
Reference Method ◽  
Laser Absorption Spectroscopy ◽  
Radiative Balance ◽  
Quantum Cascade ◽  
Laser Absorption ◽  
Federal Institute ◽  
Custom Made

<p>Water vapor (H<sub>2</sub>O) is the strongest greenhouse gas in our atmosphere, and it plays a key role in multiple processes that affect weather and climate. Particularly, H<sub>2</sub>O in the upper troposphere - lower stratosphere (UTLS) is of great importance to the Earth's radiative balance, and has a significant impact on the rate of global warming. Hence, accurate measurements of UTLS H<sub>2</sub>O are crucial for understanding and projecting climate. Currently, the reference method used for in-situ measurements of UTLS H<sub>2</sub>O aboard meteorological balloons is cryogenic frostpoint hygrometry (CFH) [1]. However, the cooling agent required for this technique (trifluoromethane) is phasing out as of 2020, due to its strong global warming potential. This represents a major challenge for the continuity of global, long-term stratospheric H<sub>2</sub>O monitoring networks, such as the GCOS Reference Upper Air Network (GRUAN).</p><p>As an alternative to CFH, we developed a compact instrument based on mid-IR quantum-cascade laser absorption spectroscopy (QCLAS) [2]. The spectrometer, with a total weight of 3.9 kg, relies on a segmented circular multipass cell [3] that was specifically developed to meet the stringent requirements, in mass, size and temperature resilience, posed by the harsh environmental conditions of the UTLS. Quick response and minimal interference by H<sub>2</sub>O outgassing from surfaces are achieved by an open-path approach. An elaborate thermal management system ensures excellent internal temperature stability, despite of outside temperature variations of up to 80 K.</p><p>In collaboration with the German Weather Service (DWD), two successful test flights were performed in December 2019 in Lindenberg, Germany. We will report on the results of these test flights, highlighting the instrument outstanding capabilities under UTLS and stratospheric conditions (up to 28 km altitude), and identifying some limitations. Further development activities triggered by the test flights, involving both hardware adaptations and spectral analysis modifications, will be also discussed.  The final validation will be addressed, in cooperation with the Swiss Federal Institute of Metrology (METAS), by laboratory experiments in a custom-made climate chamber, using dynamically generated, SI-traceable reference mixtures with H<sub>2</sub>O amount fractions below 20 ppmv and uncertainty < 1%. The ultimate goal is to demonstrate the potential of QCLAS as a highly valuable technique for quantitative balloon-borne measurements of UTLS and stratospheric H<sub>2</sub>O.</p><p>[1] Brunamonti et al. (2019), J. Geophys. Res. Atmos., doi.org/10.1029/2018JD030000.</p><p>[2] Graf et al. (2020), Atmos. Meas. Tech. Discuss., doi.org/10.5194/amt-2020-243 (Accepted 4 January 2021).</p><p>[3] Graf, Emmenegger and Tuzson (2018), Opt. Lett., doi.org/10.1364/OL.43.002434.</p>

Tunable Quantum Cascade Laser Absorption Spectroscopy for Plasma Assisted Oxidative Coupling of Methane to C2 Based Products

2021 ◽  
Author(s):  
Rajagopalan V Ranganathan ◽  
Md Monir Hossain ◽  
Shoan Talukdar ◽  
Robayet Ahasan ◽  
Ruigang Wang ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Quantum Cascade Laser ◽  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane ◽  
Laser Absorption Spectroscopy ◽  
Quantum Cascade ◽  
Laser Absorption

Shock tube measurement of NO time-histories in nitromethane pyrolysis using a quantum cascade laser at 5.26 µm

2020 ◽  
Author(s):  
Yanlei Shang ◽  
Zhen Wang ◽  
Liuhao Ma ◽  
Jinchun Shi ◽  
Hongbo Ning ◽  
...  
Keyword(s):  
Shock Tube ◽  
Quantum Cascade Laser ◽  
Quantum Cascade ◽  
Time Histories

Absorption lines measurements of carbon disulfide at 4.6 μm with quantum cascade laser absorption spectroscopy

2020 ◽  
Vol 225 ◽  
pp. 117478 ◽  
Author(s):  
Chenguang Yang ◽  
Hao Deng ◽  
Yuanyuan Qian ◽  
Mingxing Li ◽  
Bing Chen ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Carbon Disulfide ◽  
Quantum Cascade Laser ◽  
Absorption Lines ◽  
Laser Absorption Spectroscopy ◽  
Quantum Cascade ◽  
Laser Absorption

Simultaneous sensing of temperature, CO, and CO2 in a scramjet combustor using quantum cascade laser absorption spectroscopy

2014 ◽  
Vol 117 (2) ◽  
pp. 689-698 ◽  
Author(s):  
R. M. Spearrin ◽  
C. S. Goldenstein ◽  
I. A. Schultz ◽  
J. B. Jeffries ◽  
R. K. Hanson
Keyword(s):  
Absorption Spectroscopy ◽  
Quantum Cascade Laser ◽  
Laser Absorption Spectroscopy ◽  
Quantum Cascade ◽  
Laser Absorption ◽  
Scramjet Combustor ◽  
Simultaneous Sensing

Laser absorption spectroscopy based on a broadband external cavity quantum cascade laser

2017 ◽  
Author(s):  
Juan Sun ◽  
Ningwu Liu ◽  
Hao Deng ◽  
Junya Ding ◽  
Jiancha Sun ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Quantum Cascade Laser ◽  
External Cavity ◽  
Laser Absorption Spectroscopy ◽  
Quantum Cascade ◽  
Laser Absorption
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