title: A sulfur hexafluoride sensor using quantum cascade and CO2 laser-based photoacoustic spectroscopy.
abstract: The increase in greenhouse gas emissions is a serious environmental problem and has stimulated the scientific community to pay attention to the need for detection and monitoring of gases released into the atmosphere. In this regard, the development of sensitive and selective gas sensors has been the subject of several research programs. An important greenhouse gas is sulphur hexafluoride, an almost non-reactive gas widely employed in industrial processes worldwide. Indeed it is estimated that it has a radiative forcing of 0.52 W/m(2). This work compares two photoacoustic spectrometers, one coupled to a CO(2) laser and another one coupled to a Quantum Cascade (QC) laser, for the detection of SF(6). The laser photoacoustic spectrometers described in this work have been developed for gas detection at small concentrations. Detection limits of 20 ppbv for CO(2) laser and 50 ppbv for quantum cascade laser were obtained.
authors.affiliation: Laboratório de Ciências Físicas LCFIS, Universidade estadual do Norte Fluminense UENF, Av. Alberto Lamego 2000, Campos dos Goytacazes, Rio de Janeiro, Brazil. mila_vieira16@hotmail.com
authors.forename: Mila
authors.initials: M
authors.lastname: Rocha
authors.forename: Marcelo
authors.initials: M
authors.lastname: Sthel
authors.forename: Guilherme
authors.initials: G
authors.lastname: Lima
authors.forename: Marcelo
authors.initials: M
authors.lastname: da Silva
authors.forename: Delson
authors.initials: D
authors.lastname: Schramm
authors.forename: András
authors.initials: A
authors.lastname: Miklós
authors.forename: Helion
authors.initials: H
authors.lastname: Vargas
mesh_terms: D001272:Atmosphere / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods*; D017752:Greenhouse Effect; D054020:Lasers, Gas; D011789:Quantum Theory; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods*; D013459:Sulfur Hexafluoride / Q000032:analysis*
chemical_list: D013459:Sulfur Hexafluoride