Journal
OPTICS EXPRESS
Volume 24, Issue 2, Pages 859-873Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.000859
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Funding
- National Natural Science Foundation of China (NSFC) [61475068, 11104237]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [15KJB140002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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We report on the first application (to our knowledge) of an extended-wavelength (2.33 mu m) multi-mode diode laser for simultaneous measurement of the concentrations of CH4 and CO in the ambient air. The signals identification and quantitative analysis are performed using correlation spectroscopy. A Herriott cell and the wavelength modulation spectroscopy technique with second harmonic detection are also utilized to improve the detection sensitivity of the system. The detection limits of the system are estimated to be about 81 ppbv and 31 ppbv for CH4 and CO, respectively. The accuracy, sensitivity, precision, and stability are also analyzed to confirm the potential of the system. (C) 2016 Optical Society of America
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