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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Acknowledgments
JPW, HM and MB acknowledge financial support provided by the Austrian research funding association under the scope of the COMET program within the research network “Process Analytical Chemistry” (contract # 825340) and the Carinthian Tech Research RL, FKT acknowledge financial support provided by NSF ERC MIRTHE and NSF-ANR NexCILAS.
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Waclawek, J.P., Lewicki, R., Moser, H. et al. Quartz-enhanced photoacoustic spectroscopy-based sensor system for sulfur dioxide detection using a CW DFB-QCL. Appl. Phys. B 117, 113–120 (2014). https://doi.org/10.1007/s00340-014-5809-y
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DOI: https://doi.org/10.1007/s00340-014-5809-y