Journal
SENSORS
Volume 15, Issue 10, Pages 26743-26755Publisher
MDPI
DOI: 10.3390/s151026743
Keywords
quartz enhanced photoacoustic spectroscopy; near-infrared distributed feedback laser; erbium doped fiber amplifier; modulation cancelation method; multi-component traces gas detection
Funding
- National Natural Science Foundation of China [61575113, 61275213, 61108030]
- Shanxi Natural Science Foundation [2013021004-1]
- Shanxi Scholarship Council of China [2013-011, 2013-01]
Ask authors/readers for more resources
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 (1 sigma) 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available