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

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

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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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Abstract

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 3.0).
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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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