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Sensors 2015, 15(10), 26743-26755; doi:10.3390/s151026743

Fiber-Amplifier-Enhanced QEPAS Sensor for Simultaneous Trace Gas Detection of NH3 and H2S

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
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Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 31 August 2015 / Revised: 1 October 2015 / Accepted: 12 October 2015 / Published: 21 October 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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Abstract

A selective and sensitive quartz enhanced photoacoustic spectroscopy (QEPAS) sensor, employing an erbium-doped fiber amplifier (EDFA), and a distributed feedback (DFB) laser operating at 1582 nm was demonstrated for simultaneous detection of ammonia (NH3) and hydrogen sulfide (H2S). Two interference-free absorption lines located at 6322.45 cm−1 and 6328.88 cm−1 for NH3 and H2S detection, respectively, were identified. The sensor was optimized in terms of current modulation depth for both of the two target gases. An electrical modulation cancellation unit was equipped to suppress the background noise caused by the stray light. An Allan-Werle variance analysis was performed to investigate the long-term performance of the fiber-amplifier-enhanced QEPAS sensor. Benefitting from the high power boosted by the EDFA, a detection sensitivity (1σ) of 52 parts per billion by volume (ppbv) and 17 ppbv for NH3 and H2S, respectively, were achieved with a 132 s data acquisition time at atmospheric pressure and room temperature. View Full-Text
Keywords: quartz enhanced photoacoustic spectroscopy; near-infrared distributed feedback laser; erbium doped fiber amplifier; modulation cancelation method; multi-component traces gas detection quartz enhanced photoacoustic spectroscopy; near-infrared distributed feedback laser; erbium doped fiber amplifier; modulation cancelation method; multi-component traces gas detection
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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MDPI and ACS Style

Wu, H.; Dong, L.; Liu, X.; Zheng, H.; Yin, X.; Ma, W.; Zhang, L.; Yin, W.; Jia, S. Fiber-Amplifier-Enhanced QEPAS Sensor for Simultaneous Trace Gas Detection of NH3 and H2S. Sensors 2015, 15, 26743-26755.

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