Design and modeling of a photo–acoustic gas analyzer with a termal source for carbon isotope ratio analysis
K.Yu. Osipov1,2, V.A. Kapitanov1, Yu.N. Ponomarev1, A.I. Karapuzikov3
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia
3Institute of Laser Physics SB RAS, Ac. Lavrentyev's prosp., 13/3, Novosibirsk, 630090, Russia
Keywords: gas analysis, carbon isotope ratios, photoacoustic detector, absorbtion spectrum, Fabry–Perot interferometer
Abstract
It is represented the scheme of work and numerical modeling of a photoacoustic gas analyzer with IR–source and 1–st order interference filter for carbon isotope ratios analysis. An optimal spectral range for gaz analyzer operation is selected. In the selected wavelength range, the spectral characteristics of the atmosphere and some additional gazes are analyzed, which could affect the measurement results. The proposed gas analyzer allows us to measure carbon isotope ratios 13С/12С in CO2 samples with a minimal error of about 0.5‰, and could be useful for detection of such gases as SO2, CO, NH3, absorption lines of which exist in the selected spectral range.
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