title: 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.
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.
authors: Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 6089, UFR Sciences Exactes et Naturelles, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France.
authors: Lilian
authors: L
authors: Joly
authors: Claude
authors: C
authors: Robert
authors: Bertrand
authors: B
authors: Parvitte
authors: Valery
authors: V
authors: Catoire
authors: Georges
authors: G
authors: Durry
authors: Guy
authors: G
authors: Richard
authors: Bernard
authors: B
authors: Nicoullaud
authors: Virginie
authors: V
authors: Zéninari