Scientific Results

A quartz-enhanced photoacoustic sensor for H2S trace-gas detection at 2.6 mu m

Year: 2015

Authors: Viciani S., Siciliani de Cumis M., Borri S., Patimisco P., Sampaolo A., Scamarcio G., De Natale P., D’Amato F., Spagnolo V.

Autors Affiliation: CNR-INO and LENS, Via Carrara 1, 50019 Sesto Fiorentino
CNR-IFN UOS di Bari and Università e Politecnico di Bari, via Amendola 173, 70126 Bari Italy

Abstract: We report on the realization of a quartz-enhanced photoacoustic (QEPAS) sensor for measurement of H2S gas traces. A distributed feedback diode laser working at 2.64 A mu m wavelength has been coupled to an acoustic detection module composed of a quartz tuning fork and a micro-resonator system, and the QEPAS signal has been optimized in terms of gas sample pressure and laser frequency modulation depth. The sensor shows a very good linearity with respect to the H2S concentration. We performed an Allan-Werle variance analysis to investigate the sensor long-term stability, and we reached a detection limit of four parts per million for 1-s integration time and 500 parts per billion in 60-s integration time. The realized QEPAS sensor represents a good compromise between performance and handiness, in view of a fully portable device.

Journal/Review: APPLIED PHYSICS B-LASERS AND OPTICS

Volume: 119 (1)      Pages from: 21  to: 27

More Information: The authors gratefully acknowledge the financial support from the Italian Ministry of University and Research (MIUR) through the project “Active Ageing at Home” (CTN01_00128_297061, Area TAV – Tecnologie per gli Ambienti di Vita), from Regione Toscana within the frame of POR CReO FESR 2007-2013, Project SIMPAS (Innovative Measurement Systems for the Protection of Environment and Health), and the Italian research projects PON01 02238, PON02 00675 and PON02 00576.
KeyWords: Frequency modulation; Microelectromechanical devices; Resonators, Acoustic detection; Distributed feedback diode laser; Long term stability; Parts per millions; Photoacoustic sensors; Quartz tuning fork; Trace gas detection; Variance analysis, Quartz
DOI: 10.1007/s00340-014-5991-y

Citations: 17
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English