期刊
OPTICS EXPRESS
卷 19, 期 24, 页码 24037-24045出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.024037
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资金
- National Science Foundation
- Welch Foundation [C-0586]
- Regione Puglia Intervento Cod. DM01, Progetti di ricerca industriale connessi con la strategia realizzativa elaborata dal Distretto Tecnologico della Meccatronica
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1124677] Funding Source: National Science Foundation
Geometrical parameters of micro-resonator for a quartz enhanced photoacoustic spectroscopy sensor are optimized to perform sensitive and background-free spectroscopic measurements using mid-IR quantum cascade laser (QCL) excitation sources. Such an optimized configuration is applied to nitric oxide (NO) detection at 1900.08 cm(-1) (5.26 mu m) with a widely tunable, mode-hop-free external cavity QCL. For a selected NO absorption line that is free from H2O and CO2 interference, a NO detection sensitivity of 4.9 parts per billion by volume is achieved with a 1-s averaging time and 66 mW optical excitation power. This NO detection limit is determined at an optimal gas pressure of 210 Torr and 2.5% of water vapor concentration. Water is added to the analyzed mixture in order to improve the NO vibrational-translational relaxation process. (C) 2011 Optical Society of America
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