Quartz-enhanced photoacoustic spectroscopy-based sensor system for sulfur dioxide detection using a CW DFB-QCL |
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| Authors: | J P Waclawek R Lewicki H Moser M Brandstetter F K Tittel B Lendl |
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| Institution: | 1. Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-UPA, 1060, Vienna, Austria
2. Electrical and Computer Engineering Department, Rice University, MS-366; 6100 Main St., Houston, TX, 77005, USA
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| Abstract: | Sulfur dioxide (SO2) trace gas detection based on quartz-enhanced photoacoustic spectroscopy (QEPAS) using a continuous wave, distributed feedback quantum cascade laser operating at 7.24 μm was performed. Influence of water vapor addition on monitored QEPAS SO2 signal was also investigated. A normalized noise equivalent absorption coefficient of NNEA (1σ) = 1.21 × 10?8 cm?1 W Hz?1/2 was obtained for the ν 3 SO2 line centered at 1,380.93 cm?1 when the gas sample was moisturized with 2.3 % H2O. This corresponds to a minimum detection limit (1σ) of 63 parts per billion by volume for a 1 s lock-in time constant. |
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