scholarly journals The absorption spectrum of water vapor in the 2.2 μm transparency window: High sensitivity measurements and spectroscopic database

2017 ◽  
Vol 189 ◽  
pp. 407-416 ◽  
Author(s):  
A. Campargue ◽  
S.N. Mikhailenko ◽  
S. Vasilchenko ◽  
C. Reynaud ◽  
S. Béguier ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Water Vapor ◽  
High Sensitivity ◽  
Transparency Window ◽  
Spectroscopic Database

The CO2 absorption spectrum in the 2.3 µm transparency window by high sensitivity CRDS: (I) Rovibrational lines

2016 ◽  
Vol 184 ◽  
pp. 233-240 ◽  
Author(s):  
S. Vasilchenko ◽  
M. Konefal ◽  
D. Mondelain ◽  
S. Kassi ◽  
P. Čermák ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
High Sensitivity ◽  
Transparency Window ◽  
Co2 Absorption

Inter-Pulse Spectroscopy Based on Room-Temperature Pulsed Quantum-Cascade Laser for N2O Detection

2011 ◽  
Vol 128-129 ◽  
pp. 607-610
Author(s):  
Min Wang ◽  
Jie Chen ◽  
Niu Liu ◽  
Ya Wang
Keyword(s):  
Absorption Spectrum ◽  
Room Temperature ◽  
Single Point ◽  
High Sensitivity ◽  
Fast Response ◽  
Trace Gas ◽  
High Resolution Spectrum ◽  
Light Sources ◽  
Quantum Cascade ◽  
Pulse Spectroscopy

Mid-infrared lasers are very suitable for high-sensitive trace-gases detection for their wavelengths cover the fundamental absorption lines of most gases. Quantum-cascade (QC) lasers have been demonstrated to be ideal light sources with its special power, tuning and capability of operating in room-temperature. All these merits make it appropriate for the high resolution spectrum analysis. The absorption spectrum monitoring technology based on the QC laser pulsed operating in the room temperature, combining with the strong absorption of the gas molecule in the basic frequency, has become an effective way to monitor the trace gas with the characteristic of high sensitivity, good selectivity and fast response. In this paper, the inter-pulse spectroscopy based on a room-temperature distributed-feedback pulsed QC laser was introduced. Our approach to trace gas monitoring with QC lasers relies on short current pulses which are designed to produce even shorter light pulses. Each pulse corresponds to a single point in a spectrum. The N2O absorption spectrum centered at 2178.2cm-1was also obtained.

scholarly journals Characterization and mitigation of water vapor effects in the measurement of ozone by chemiluminescence with nitric oxide

2013 ◽  
Vol 6 (5) ◽  
pp. 9263-9295
Author(s):  
P. Boylan ◽  
D. Helmig ◽  
J.-H. Park
Keyword(s):  
Nitric Oxide ◽  
Water Vapor ◽  
Mole Fraction ◽  
Laboratory Experiments ◽  
High Sensitivity ◽  
Fast Response ◽  
Atmospheric Ozone ◽  
Permeable Membrane ◽  
Signal Correction ◽  
High Sensitivity Detection

Abstract. Laboratory experiments were conducted to investigate the effects of water vapor on the reaction of nitric oxide with ozone in a chemiluminescence instrument used for fast response and high sensitivity detection of atmospheric ozone. Water vapor was introduced into a constant level ozone standard and both ozone and water vapor signals were recorded at 10 Hz. The presence of water vapor was found to reduce, i.e. quench the ozone signal. A correction factor was determined to be 4.15 ± 0.14 × 10−3, which corresponds to a 4.15% increase in the measured ozone signal per 10 mmol mol−1 co-sampled water vapor. An ozone-inert water vapor permeable membrane (Nafion dryer) was installed in the sampling line and was shown to remove the bulk of the water vapor mole fraction in the sample air. At water vapor mole fractions above 25 mmol mol−1, the Nafion dryer removed over 75% of the water vapor in the sample. This reduced the ozone signal correction from over 11% to less than 2.5%. The Nafion dryer was highly effective at reducing the fast fluctuations of the water vapor signal (more than 97%) while leaving the ozone signal unaffected, which is a crucial improvement for minimizing the interference of water vapor fluxes on the ozone flux determination by the eddy covariance technique.

Supermagnetic cellulose nanocrystal hybrids reinforced PHBV nanocomposites with high sensitivity to intelligently detect water vapor

2020 ◽  
Vol 154 ◽  
pp. 112704 ◽  
Author(s):  
Somia Yassin Hussain Abdalkarim ◽  
Yanyan Wang ◽  
Hou-Yong Yu ◽  
Zhaofeng Ouyang ◽  
Rabie A.M. Asad ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Sensitivity ◽  
Cellulose Nanocrystal

scholarly journals The absorption spectrum of 13CH4 in the 1.58 µm transparency window (6147–6653 cm−1)

2020 ◽  
Vol 244 ◽  
pp. 106842
Author(s):  
A. Campargue ◽  
E.V. Karlovets ◽  
E. Starikova ◽  
A. Sidorenko ◽  
D. Mondelain
Keyword(s):  
Absorption Spectrum ◽  
Transparency Window

Practical Algorithm for Reducing Convex Spike Noises on a Spectrum

2003 ◽  
Vol 57 (3) ◽  
pp. 317-322 ◽  
Author(s):  
Yukiteru Katsumoto ◽  
Yukihiro Ozaki
Keyword(s):  
Water Vapor ◽  
Cosmic Rays ◽  
Quantitative Data ◽  
High Sensitivity ◽  
Moving Window ◽  
Smoothing Techniques ◽  
Quantitative Data Analysis ◽  
Raman And Infrared Spectroscopy ◽  
Practical Algorithm ◽  
The Difference

Quantitative data analysis and high-sensitivity measurements by use of Raman and infrared spectroscopy often suffer from noisy spikes such as those due to cosmic rays and water vapor. Since these spikes are unidirectional and isolated, the conventional smoothing techniques do a poor job of removing them. However, a small modification can improve these smoothing techniques significantly. In this paper, we present a simple denoising technique for a single-scan spectrum that is corrupted by convex spikes. In general, the noisy spikes arising from cosmic rays or water vapor have a much narrower bandwidth compared with target “informative” bands in Raman and infrared spectra. This means that these noisy spikes can be separated from the target bands by means of the difference in the bandwidths. The proposed method employs the moving window averaging procedure to distinguish and separate the convex spike. The proposed algorithm allows us to take away the convex spikes from measured spectra without preparing multiply recorded spectra and (much) biasing the measured spectrum.

scholarly journals Indirect Nanoplasmonic Sensing to Probe with a High Sensitivity the Interaction of Water Vapor with Soot Aerosols

2015 ◽  
Vol 6 (20) ◽  
pp. 4148-4152 ◽  
Author(s):  
Benjamin Demirdjian ◽  
Frederic Bedu ◽  
Alain Ranguis ◽  
Igor Ozerov ◽  
Artak Karapetyan ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Sensitivity
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