Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification

Francis Hindle; Arnaud Cuisset; Robin Bocquet; Gaël Mouret

doi:10.1016/j.crhy.2007.07.009

Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification
[Ondes continues térahertz par système de photomélange : applications à la detection et à la quantification des gaz polluants]

Francis Hindle ¹ ; Arnaud Cuisset ¹ ; Robin Bocquet ¹ ; Gaël Mouret ¹

¹ Laboratoire de physico-chimie de l'atmosphère, UMR CNRS 8101, Université du Littoral Côte d'Opale, 189A, avenue Maurice-Schumann, 59140 Dunkerque, France

Comptes Rendus. Physique, Recent developments in terahertz optoelectronics, Volume 9 (2008) no. 2, pp. 262-275.

Résumé
Abstract

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 ( $\approx 200 μm$ ) 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 $\approx 200 μm$ 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.

Publié le : 2007-11-19

DOI : 10.1016/j.crhy.2007.07.009

Keywords: Terahertz, Gas phase pollutants
Mots-clés : Térahertz, Gaz polluants

Affiliations des auteurs :

Francis Hindle ¹ ; Arnaud Cuisset ¹ ; Robin Bocquet ¹ ; Gaël Mouret ¹

¹ Laboratoire de physico-chimie de l'atmosphère, UMR CNRS 8101, Université du Littoral Côte d'Opale, 189A, avenue Maurice-Schumann, 59140 Dunkerque, France

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     pages = {262--275},
     publisher = {Elsevier},
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Francis Hindle; Arnaud Cuisset; Robin Bocquet; Gaël Mouret. Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification. Comptes Rendus. Physique, Recent developments in terahertz optoelectronics, 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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Francis Hindle; Pascal Szriftgiser; Denis Bacquet; Chun Yang; Gael Mouret; Robin Bocquet Fiber‐based telecoms components at 1550 nm for the generation of cw‐THz by photomixing, Microwave and Optical Technology Letters, Volume 51 (2009) no. 4, p. 991 | DOI:10.1002/mop.24207
Francis Hindle; Chun Yang; Gael Mouret; Arnaud Cuisset; Robin Bocquet; Jean-François Lampin; Karine Blary; Emilien Peytavit; Tahsin Akalin; Guillaume Ducournau Recent Developments of an Opto-Electronic THz Spectrometer for High-Resolution Spectroscopy, Sensors, Volume 9 (2009) no. 11, p. 9039 | DOI:10.3390/s91109039
Vincent Dabouis; Yves Chancerelle; David Crouzier; Jean-Claude Debouzy À la frontière onde-lumière, médecine/sciences, Volume 25 (2009) no. 8-9, p. 739 | DOI:10.1051/medsci/2009258-9739
Chun Yang; Jeanna Buldyreva; Iouli E. Gordon; François Rohart; Arnaud Cuisset; Gaël Mouret; Robin Bocquet; Francis Hindle Oxygen, nitrogen and air broadening of HCN spectral lines at terahertz frequencies, Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 109 (2008) no. 17-18, p. 2857 | DOI:10.1016/j.jqsrt.2008.08.005

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