Cet article résume les récentes avancées dans le développement de sources monochromatiques et continues d'ondes térahertz utilisées dans des expériences de spectroscopie à haute résolution en phase gazeuse, consacrées à la métrologie de polluants. Les caractéristiques d'une source optoélectronique employant un photomélangeur ultrarapide sont détaillées ainsi que son emploi dans la réalisation d'un spectromètre térahertz utilisé dans diverses applications spectroscopiques. L'analyse de H2S et OCS a permis d'une part de valider les performances du spectromètre conçu et d'autre part de déterminer des paramètres spectroscopiques tels que les forces de raie et les coefficients d'élargissement par pression associés aux transitions rotationnelles d'OCS. La pureté spectrale (5 MHz), l'accordabilitié de 0,3 à 3 THz et la longueur d'onde importante () de cette source ont été exploitées pour identifier et quantifier des espèces chimiques dans la fumée de cigarette. Les expériences réalisées tirent avantage du rayonnement térahertz qui offre une haute sélectivité et permet de réaliser des mesures dans des échantillons gazeux largement contaminés par de nombreux aérosols et particules.
Recent advances in the development of monochromatic continuous-wave terahertz sources suitable for high resolution gas phase spectroscopy and pollution monitoring are reviewed. Details of a source using an ultra fast opto-electronic photomixing element are presented. The construction of a terahertz spectrometer using this source has allowed spectroscopic characterisation and application studies to be completed. Analysis of H2S and OCS under laboratory conditions are used to demonstrate the spectrometer performance, and the determination of the transition line strengths and pressure self broadening coefficients for pure rotational transitions of OCS. The spectral purity 5 MHz, tunability 0.3 to 3 THz, and long wavelength of this source have been exploited to identify and quantify numerous chemical species in cigarette smoke. The key advantages of this frequency domain are its high species selectivity and the possibility to make reliable measurements of gas phase samples heavily contaminated by aerosols and particles.
Mot clés : Térahertz, Gaz polluants
Francis Hindle 1 ; Arnaud Cuisset 1 ; Robin Bocquet 1 ; Gaël Mouret 1
@article{CRPHYS_2008__9_2_262_0, author = {Francis Hindle and Arnaud Cuisset and Robin Bocquet and Ga\"el Mouret}, title = {Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification}, journal = {Comptes Rendus. Physique}, pages = {262--275}, publisher = {Elsevier}, volume = {9}, number = {2}, year = {2008}, doi = {10.1016/j.crhy.2007.07.009}, language = {en}, }
TY - JOUR AU - Francis Hindle AU - Arnaud Cuisset AU - Robin Bocquet AU - Gaël Mouret TI - Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification JO - Comptes Rendus. Physique PY - 2008 SP - 262 EP - 275 VL - 9 IS - 2 PB - Elsevier DO - 10.1016/j.crhy.2007.07.009 LA - en ID - CRPHYS_2008__9_2_262_0 ER -
%0 Journal Article %A Francis Hindle %A Arnaud Cuisset %A Robin Bocquet %A Gaël Mouret %T Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification %J Comptes Rendus. Physique %D 2008 %P 262-275 %V 9 %N 2 %I Elsevier %R 10.1016/j.crhy.2007.07.009 %G en %F CRPHYS_2008__9_2_262_0
Francis Hindle; Arnaud Cuisset; Robin Bocquet; Gaël Mouret. Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification. Comptes Rendus. Physique, Volume 9 (2008) no. 2, pp. 262-275. doi : 10.1016/j.crhy.2007.07.009. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.07.009/
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