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

Sensors

Mila Rocha¹  Marcelo Sthel¹  Guilherme Lima¹  Marcelo da Silva¹  Delson Schramm¹  András Miklós² 

[1] Laboratório de Ciências Físicas LCFIS, Universidade estadual do Norte Fluminense UENF,Av. Alberto Lamego 2000, Campos dos Goytacazes, Rio de Janeiro, Brazil; E-Mails:;Fraunhofer Institute for Building Physics, Stuttgart, Germany; E-Mail:

关键词: sulfur hexafluoride;    photoacoustic spectroscopy;    sensors;   

DOI  :  10.3390/s101009359

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.