Optical feedback cavity-enhanced absorption spectroscopy with a 3.24 μm interband cascade laser

2015 ◽  
Vol 106 (22) ◽  
pp. 221106 ◽  
Author(s):  
K. M. Manfred ◽  
G. A. D. Ritchie ◽  
N. Lang ◽  
J. Röpcke ◽  
J. H. van Helden
Keyword(s):  
Absorption Spectroscopy ◽  
Optical Feedback ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Interband Cascade Laser

scholarly journals Simultaneous detection of C<sub>2</sub>H<sub>6</sub>, CH<sub>4</sub>, and <i>δ</i><sup>13</sup>C-CH<sub>4</sub> using optical feedback cavity-enhanced absorption spectroscopy in the mid-infrared region: towards application for dissolved gas measurements

2019 ◽  
Vol 12 (6) ◽  
pp. 3101-3109 ◽  
Author(s):  
Loic Lechevallier ◽  
Roberto Grilli ◽  
Erik Kerstel ◽  
Daniele Romanini ◽  
Jérôme Chappellaz
Keyword(s):  
Absorption Spectroscopy ◽  
Optical Feedback ◽  
Optical Cavity ◽  
Simultaneous Detection ◽  
Infrared Region ◽  
Integration Time ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Interband Cascade Laser ◽  
Gas Measurements

Abstract. Simultaneous measurement of C2H6 and CH4 concentrations, and of the δ13C-CH4 isotope ratio is demonstrated using a cavity-enhanced absorption spectroscopy technique in the mid-IR region. The spectrometer is compact and has been designed for field operation. It relies on optical-feedback-assisted injection of 3.3 µm radiation from an interband cascade laser (ICL) into a V-shaped high-finesse optical cavity. A minimum absorption coefficient of 2.8×10-9 cm−1 is obtained in a single scan (0.1 s) over 0.7 cm−1. Precisions of 3 ppbv, 11 ppbv, and 0.08 ‰ for C2H6, CH4, and δ13C-CH4, respectively, are achieved after 400 s of integration time. Laboratory calibrations and tests of performance are reported here. They show the potential for the spectrometer to be embedded in a sensor probe for in situ measurements in ocean waters, which could have important applications for the understanding of the source and fate of hydrocarbons from the seabed and in the water column.

scholarly journals Simultaneous Detection of C<sub>2</sub>H<sub>6</sub>, CH<sub>4</sub> and δ<sup>13</sup>C-CH<sub>4</sub> Using Optical Feedback Cavity Enhanced Absorption Spectroscopy in the Mid-Infrared Region: Towards Application for Dissolved Gas Measurements

2018 ◽  
Author(s):  
Loic Lechevallier ◽  
Roberto Grilli ◽  
Erik Kerstel ◽  
Daniele Romanini ◽  
Jérôme Chappellaz
Keyword(s):  
Absorption Spectroscopy ◽  
Optical Feedback ◽  
Optical Cavity ◽  
Simultaneous Detection ◽  
Infrared Region ◽  
Integration Time ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Interband Cascade Laser ◽  
Gas Measurements

Abstract. Simultaneous measurement of C2H6 and CH4 concentrations, and of the δ13C-CH4 isotope ratio is demonstrated using a cavity enhanced absorption spectroscopy technique in the mid-IR region. The spectrometer is compact and has been designed for field operation. It relies on optical-feedback assisted injection of 3.3-μm radiation from an Interband Cascade Laser (ICL) into a V-shaped high-finesse optical cavity. A minimum absorption coefficient of 2.8 × 10−9 cm−1 is obtained in a single scan (0.1 s) over 0.7 cm−1. Precisions of 3 ppbv, 11 ppbv, and 0.08 ‰ for C2H6, CH4, and δ13C-CH4, respectively, are achieved after 400 s of integration time. Laboratory calibrations and tests of performance are reported here. They show the potential for the spectrometer to be embedded in a sensor probe for in situ measurements in ocean waters, which could have important applications for the understanding of the source and fate of hydrocarbons from the seabed and in the water column.

scholarly journals Comparison of optical-feedback cavity-enhanced absorption spectroscopy and gas chromatography for ground-based and airborne measurements of atmospheric CO concentration

2017 ◽  
Vol 10 (5) ◽  
pp. 1803-1812 ◽  
Author(s):  
Irène Ventrillard ◽  
Irène Xueref-Remy ◽  
Martina Schmidt ◽  
Camille Yver Kwok ◽  
Xavier Faïn ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
High Performance ◽  
Optical Feedback ◽  
Mercuric Oxide ◽  
Gas Chromatograph ◽  
Laser Spectrometer ◽  
Airborne Measurements ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Compact Size

Abstract. We present the first comparison of carbon monoxide (CO) measurements performed with a portable laser spectrometer that exploits the optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) technique, against a high-performance automated gas chromatograph (GC) with a mercuric oxide reduction gas detector (RGD). First, measurements of atmospheric CO mole fraction were continuously collected in a Paris (France) suburb over 1 week. Both instruments showed an excellent agreement within typically 2 ppb (part per billion in volume), fulfilling the World Meteorological Organization (WMO) recommendation for CO inter-laboratory comparison. The compact size and robustness of the OF-CEAS instrument allowed its operation aboard a small aircraft employed for routine tropospheric air analysis over the French Orléans forest area. Direct OF-CEAS real-time CO measurements in tropospheric air were then compared with later analysis of flask samples by the gas chromatograph. Again, a very good agreement was observed. This work establishes that the OF-CEAS laser spectrometer can run unattended at a very high level of sensitivity ( <  1 ppb) and stability without any periodic calibration.

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