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Sensors 2017, 17(3), 513; doi:10.3390/s17030513

Mid-Infrared Trace Gas Sensor Technology Based on Intracavity Quartz-Enhanced Photoacoustic Spectroscopy

1
Institute of Optoelectronics, Military University of Technology, 00-908 Warsaw, Poland
2
Electronics Faculty, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
3
Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005-1892, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Paul A. Solomon and Melissa Lunden
Received: 27 January 2017 / Revised: 24 February 2017 / Accepted: 2 March 2017 / Published: 4 March 2017
(This article belongs to the Special Issue Air Pollution Sensors: A New Class of Tools to Measure Air Quality)
View Full-Text   |   Download PDF [3929 KB, uploaded 4 March 2017]   |  

Abstract

The application of compact inexpensive trace gas sensor technology to a mid-infrared nitric oxide (NO) detectoion using intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) is reported. A minimum detection limit of 4.8 ppbv within a 30 ms integration time was demonstrated by using a room-temperature, continuous-wave, distributed-feedback quantum cascade laser (QCL) emitting at 5.263 µm (1900.08 cm−1) and a new compact design of a high-finesse bow-tie optical cavity with an integrated resonant quartz tuning fork (QTF). The optimum configuration of the bow-tie cavity was simulated using custom software. Measurements were performed with a wavelength modulation scheme (WM) using a 2f detection procedure. View Full-Text
Keywords: laser absorption spectroscopy; bow-tie cavity; I-QEPAS; intracavity quartz-enhanced photoacoustic spectroscopy; mid-infrared trace gas sensors laser absorption spectroscopy; bow-tie cavity; I-QEPAS; intracavity quartz-enhanced photoacoustic spectroscopy; mid-infrared trace gas sensors
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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. (CC BY 4.0).

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Wojtas, J.; Gluszek, A.; Hudzikowski, A.; Tittel, F.K. Mid-Infrared Trace Gas Sensor Technology Based on Intracavity Quartz-Enhanced Photoacoustic Spectroscopy. Sensors 2017, 17, 513.

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