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Sensors 2014, 14(4), 6165-6206;

Quartz-Enhanced Photoacoustic Spectroscopy: A Review

Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
Dipartimento Interateneo di Fisica, Università degli studi di Bari Aldo Moro e Politecnico di Bari, Via Amendola 173, Bari, I-70126, Italy
Author to whom correspondence should be addressed.
Received: 29 November 2013 / Revised: 18 February 2014 / Accepted: 21 March 2014 / Published: 28 March 2014
(This article belongs to the Special Issue Gas Sensors - 2013)
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A detailed review on the development of quartz-enhanced photoacoustic sensors (QEPAS) for the sensitive and selective quantification of molecular trace gas species with resolved spectroscopic features is reported. The basis of the QEPAS technique, the technology available to support this field in terms of key components, such as light sources and quartz-tuning forks and the recent developments in detection methods and performance limitations will be discussed. Furthermore, different experimental QEPAS methods such as: on-beam and off-beam QEPAS, quartz-enhanced evanescent wave photoacoustic detection, modulation-cancellation approach and mid-IR single mode fiber-coupled sensor systems will be reviewed and analysed. A QEPAS sensor operating in the THz range, employing a custom-made quartz-tuning fork and a THz quantum cascade laser will be also described. Finally, we evaluated data reported during the past decade and draw relevant and useful conclusions from this analysis. View Full-Text
Keywords: quartz enhanced photoacoustic spectroscopy; quartz tuning fork; gas sensing; mid-IR and THz laser spectroscopy quartz enhanced photoacoustic spectroscopy; quartz tuning fork; gas sensing; mid-IR and THz laser spectroscopy

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Patimisco, P.; Scamarcio, G.; Tittel, F.K.; Spagnolo, V. Quartz-Enhanced Photoacoustic Spectroscopy: A Review. Sensors 2014, 14, 6165-6206.

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