Sensors 2013, 13(3), 3331-3340; doi:10.3390/s130303331
Article

THz QCL-Based Cryogen-Free Spectrometer for in Situ Trace Gas Sensing

1,* email, 1email, 2email, 2email, 1,3email and 1email
Received: 3 January 2013; in revised form: 2 March 2013 / Accepted: 8 March 2013 / Published: 11 March 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: We report on a set of high-sensitivity terahertz spectroscopy experiments making use of QCLs to detect rotational molecular transitions in the far-infrared. We demonstrate that using a compact and transportable cryogen-free setup, based on a quantum cascade laser in a closed-cycle Stirling cryostat, and pyroelectric detectors, a considerable improvement in sensitivity can be obtained by implementing a wavelength modulation spectroscopy technique. Indeed, we show that the sensitivity of methanol vapour detection can be improved by a factor ≈ 4 with respect to standard direct absorption approaches, offering perspectives for high sensitivity detection of a number of chemical compounds across the far-infrared spectral range.
Keywords: terahertz spectroscopy; quantum cascade lasers; trace gas sensing
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MDPI and ACS Style

Consolino, L.; Bartalini, S.; Beere, H.E.; Ritchie, D.A.; Vitiello, M.S.; De Natale, P. THz QCL-Based Cryogen-Free Spectrometer for in Situ Trace Gas Sensing. Sensors 2013, 13, 3331-3340.

AMA Style

Consolino L, Bartalini S, Beere HE, Ritchie DA, Vitiello MS, De Natale P. THz QCL-Based Cryogen-Free Spectrometer for in Situ Trace Gas Sensing. Sensors. 2013; 13(3):3331-3340.

Chicago/Turabian Style

Consolino, Luigi; Bartalini, Saverio; Beere, Harvey E.; Ritchie, David A.; Vitiello, Miriam S.; De Natale, Paolo. 2013. "THz QCL-Based Cryogen-Free Spectrometer for in Situ Trace Gas Sensing." Sensors 13, no. 3: 3331-3340.

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