Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4927057
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Funding
- Special Financial Grant from the China Postdoctoral Science Foundation [2015T80350]
- Natural Science Foundation of Heilongjiang Province of China [F2015011]
- postdoctoral fund of Heilongjiang Province [LBH-Z14074]
- Fundamental Research Funds for Central Universities [HIT. NSRIF. 2015044]
- General Financial Grant from the China Postdoctoral Science Foundation [2014M560262, 2013M531040]
- National Key Scientific Instrument and Equipment Development Projects of China [2012YQ040164]
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A multi-quartz-enhanced photoacoustic spectroscopy (M-QEPAS) sensor system for trace gas detection is reported. Instead of a single quartz tuning fork (QTF) as used in QEPAS technique, a dual QTF sensor platform was adopted in M-QEPAS to increase the signal strength by the addition of the detected QEPAS signals. Water vapor was selected as the target analyte. M-QEPAS realized a 1.7 times signal enhancement as compared to the QEPAS method for the same operating conditions. A minimum detection limit of 23.9 ppmv was achieved for the M-QEPAS sensor, with a calculated normalized noise equivalent absorption coefficient of 5.95 x 10(-8) cm(-1) W/root Hz. The M-QEPAS sensor performance can be further improved when more QTFs are employed or an acoustic micro-resonator architecture is used. (C) 2015 AIP Publishing LLC.
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