Development of a spectrometer using a continuous wave distributed feedback quantum cascade laser operating at room temperature for the simultaneous analysis of N<sub>2</sub>O and CH<sub>4</sub> in the Earth's atmosphere

Lilian Joly; Claude Robert; Bertrand Parvitte; Valery Catoire; Georges Durry; Guy Richard; Bernard Nicoullaud; Virginie Zéninari

doi:10.1364/AO.47.001206

Applied Optics
Vol. 47,
Issue 9,
pp. 1206-1214
(2008)
•https://doi.org/10.1364/AO.47.001206

Development of a spectrometer using a continuous wave distributed feedback quantum cascade laser operating at room temperature for the simultaneous analysis of $N_{2} O$ and ${CH}_{4}$ in the Earth’s atmosphere

Lilian Joly, Claude Robert, Bertrand Parvitte, Valery Catoire, Georges Durry, Guy Richard, Bernard Nicoullaud, and Virginie Zéninari

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Lilian Joly, Claude Robert, Bertrand Parvitte, Valery Catoire, Georges Durry, Guy Richard, Bernard Nicoullaud, and Virginie Zéninari, "Development of a spectrometer using a continuous wave distributed feedback quantum cascade laser operating at room temperature for the simultaneous analysis of N₂O and CH₄ in the Earth's atmosphere," Appl. Opt. 47, 1206-1214 (2008)

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Abstract

We report on the development and performance of a gas sensor based on a distributed feedback quantum cascade laser operating in continuous wave at room temperature for simultaneous measurement of nitrous oxide ( $N_{2} O$ ) and methane ( ${CH}_{4}$ ) concentrations at ground level. The concentrations of the gases are determined by a long path infrared diode laser absorption spectroscopy. The long-term stability of the instrument is evaluated using the Allan variance technique. A preliminary evaluation of the instrument performance is realized by in situ measurements of $N_{2} O$ and ${CH}_{4}$ concentrations at ground level during 1 day. The sensor has also been applied to study the time response of $N_{2} O$ concentrations to a fertilizer addition in a soil sample and for the comparison between various types of soils.

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	${CH}_{4}$	$N_{2} O$
Soil Texture (Soil Type [22])	(ppm)	(ppm)
Reference (ambient air without soil)	$1.93 \pm 0.02$	$0.319 \pm 0.002$
Clay soil (Eutric Fluvisol)	$1.92 \pm 0.02$	$54.2 \pm 0.6$
Clay loam soil (Mollic Fluvisol)	$1.94 \pm 0.02$	$81.4 \pm 0.9$
Humic soil (Mollic Fluvisol)	$1.93 \pm 0.02$	$74.8 \pm 0.8$
Clay loam soil (Haplic Luvisol)	$1.93 \pm 0.02$	$66.7 \pm 0.7$
Clay loam soil (Haplic Luvisol)	$1.92 \pm 0.02$	$43.1 \pm 0.5$
Loamy soil (Gleyic Luvisol)	$1.91 \pm 0.02$	$1.52 \pm 0.01$

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Applied Optics