Abstract
Simultaneous measurements of gas temperature and CO2 concentration in combustion gases using an extended-wavelength diode laser sensor at 2.0 μm are reported. A CO2 transition pair located near 5,006.140 and 5,010.725 cm−1 is selected based on existing line-selection criteria. The gas temperature and CO2 concentration are inferred from the peak heights of the 1f-normalized WMS-2f signals. Some important factors (modulation depth, total pressure, and species concentration) influencing the performance of the sensor are discussed. Validation experiments performed in a heated static cell indicated that the sensor has accuracies of 1.21 and 2.98 % for temperature and CO2 concentration measurement. The demonstration in combustion gases produced by a burner illustrates the potential of the 1f-normalized WMS-2f sensor for combustion diagnosis.
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Acknowledgments
The work is funded by the National Natural Science Foundation of China (No. 11104237, No. 61475068), the Open Research Fund of Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences (No. 2012JJ04), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). We thank in particular Prof. Jow-Tsong Shy for the participation.
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Cai, T., Gao, G., Wang, M. et al. Simultaneous measurements of temperature and CO2 concentration employing diode laser absorption near 2.0 μm. Appl. Phys. B 118, 471–480 (2015). https://doi.org/10.1007/s00340-015-6015-2
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DOI: https://doi.org/10.1007/s00340-015-6015-2