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Sensors 2010, 10(10), 9359-9368; doi:10.3390/s101009359

A Sulfur Hexafluoride Sensor Using Quantum Cascade and CO2 Laser-Based Photoacoustic Spectroscopy

1,* , 1
1 Laboratório de Ciências Físicas LCFIS, Universidade estadual do Norte Fluminense UENF, Av. Alberto Lamego 2000, Campos dos Goytacazes, Rio de Janeiro, Brazil 2 Fraunhofer Institute for Building Physics, Stuttgart, Germany
* Author to whom correspondence should be addressed.
Received: 30 August 2010 / Revised: 29 September 2010 / Accepted: 3 October 2010 / Published: 18 October 2010
(This article belongs to the Special Issue Gas Sensors - 2010)
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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/m2. This work compares two photoacoustic spectrometers, one coupled to a CO2 laser and another one coupled to a Quantum Cascade (QC) laser, for the detection of SF6. The laser photoacoustic spectrometers described in this work have been developed for gas detection at small concentrations. Detection limits of 20 ppbv for CO2 laser and 50 ppbv for quantum cascade laser were obtained.
Keywords: sulfur hexafluoride; photoacoustic spectroscopy; sensors sulfur hexafluoride; photoacoustic spectroscopy; sensors
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Rocha, M.; Sthel, M.; Lima, G.; Silva, M.; Schramm, D.; Miklós, A.; Vargas, H. A Sulfur Hexafluoride Sensor Using Quantum Cascade and CO2 Laser-Based Photoacoustic Spectroscopy. Sensors 2010, 10, 9359-9368.

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