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Sensors 2009, 9(11), 9039-9057; doi:10.3390/s91109039

Recent Developments of an Opto-Electronic THz Spectrometer for High-Resolution Spectroscopy

1,2,3,* , 1,2,3
1 Université Lille Nord de France, F-59000 Lille, France 2 ULCO, LPCA, 189A Av. Maurice Schumann, F-59140 Dunkerque, France 3 CNRS, UMR 8101, F-59140 Dunkerque, France 4 IEMN, Avenue Poincaré, BP 60069, F-59652 Villeneuve d'Ascq cedex, France 5 CNRS, UMR 8520, F-59652 Villeneuve d'Ascq, France
* Author to whom correspondence should be addressed.
Received: 21 September 2009 / Revised: 13 October 2009 / Accepted: 29 October 2009 / Published: 13 November 2009
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
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A review is provided of sources and detectors that can be employed in the THz range before the description of an opto-electronic source of monochromatic THz radiation. The realized spectrometer has been applied to gas phase spectroscopy. Air-broadening coefficients of HCN are determined and the insensitivity of this technique to aerosols is demonstrated by the analysis of cigarette smoke. A multiple pass sample cell has been used to obtain a sensitivity improvement allowing transitions of the volatile organic compounds to be observed. A solution to the frequency metrology is presented and promises to yield accurate molecular line center measurements.
Keywords: THz; photomixing; high-resolution spectroscopy; gas phase THz; photomixing; high-resolution spectroscopy; gas phase
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hindle, F.; Yang, C.; Mouret, G.; Cuisset, A.; Bocquet, R.; Lampin, J.-F.; Blary, K.; Peytavit, E.; Akalin, T.; Ducournau, G. Recent Developments of an Opto-Electronic THz Spectrometer for High-Resolution Spectroscopy. Sensors 2009, 9, 9039-9057.

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