Part-per-trillion level SF6 detection using a quartz enhanced photoacoustic spectroscopy-based sensor with single-mode fiber-coupled quantum cascade laser excitation

Year: 2012

Authors: Spagnolo, V; Patimisco, P; Borri, S; Scamarcio, G; Bernacki, BE; Kriesel, J

Autors Affiliation: Dipartimento Interateneo di Fisica, University and Politecnico of Bari, CNR-IFN UOS BARI, Via Amendola 173, Bari 70100, Italy;
Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, USA;
Opto-Knowledge Systems Inc., 19805 Hamilton Avenue, Torrance, California 90502, USA

Abstract: A sensitive spectroscopic sensor based on a hollow-core fiber-coupled quantum cascade laser (QCL) emitting at 10.54 mu m and quartz enhanced photoacoustic spectroscopy (QEPAS) technique is reported. The design and realization of mid-IR fiber and coupler optics has ensured single-mode QCL beam delivery to the QEPAS sensor. The collimation optics was designed to produce a laser beam of significantly reduced beam size and waist so as to prevent illumination of the quartz tuning fork and microresonator tubes. SF6 was selected as the target gas. A minimum detection sensitivity of 50 parts per trillion in 1 s was achieved with a QCL power of 18 mW, corresponding to a normalized noise-equivalent absorption of 2.7 x 10(-10) W . cm(-1)/Hz(1/2). (C) 2012 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 37 (21)      Pages from: 4461  to: 4463

More Information: The authors acknowledge financial support from the Italian research projects: PON01_02238 and PON02_00675.
KeyWords: Beam size; Detection sensitivity; Hollow-core; Micro resonators; Parts per trillion; Quartz tuning fork; Quartz-enhanced photoacoustic spectroscopies; Single mode; Target gas, Laser excitation; Lasers; Photoacoustic effect; Photoacoustic spectroscopy; Quantum cascade lasers; Quartz; Single mode fibers; Sulfur hexafluoride, Sensors
DOI: 10.1364/OL.37.004461

Citations: 139
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