Multispectrum rotational states distribution thermometry: Application to the 3ν 1+ ν 3band of carbon dioxide
Kaenders, W. G.
KAUST DepartmentElectrical Engineering Program
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/665173
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AbstractIn this paper we propose multispectrum rotational states distribution thermometry as an optical method for primary thermometry. It relies on a global fitting of multiple absorption lines of the same band at different pressures. The approach allows leveraging both the temperature-dependent Doppler width and the temperature-dependent distribution of line intensities across the ro-vibrational band. We provide a proof-of-principle demonstration of the approach on the 3ν 1 + ν 3 band of CO2, for which several accurate line-strength models of both theoretical and experimental origin are available for the global fitting. Our experimental conditions do not allow to test the methodology beyond a combined uncertainty of 530 ppm, but the comparative analysis between different line-strength models shows promise to reduce the error budget to few tens of ppm. As compared to Doppler-broadening thermometry, the approach is advantageous to mitigate systematic errors induced by a wrong modelling of absorption line-shapes and to reduce, for a given experimental dataset, the statistical uncertainty by a factor of 2. When applied in a reverse way, i.e. using a gas of known temperature, the approach becomes a stringent testbed for the accuracy of the adopted line-strength model.
CitationGotti, R., Lamperti, M., Gatti, D., Wójtewicz, S., Puppe, T., Mayzlin, Y., … Marangoni, M. (2020). Multispectrum rotational states distribution thermometry: application to the 3ν 1 + ν 3 band of carbon dioxide. New Journal of Physics, 22(8), 083071. doi:10.1088/1367-2630/aba85d
SponsorsThe authors acknowledge a financial contribution from the cooperative project OSR-2019-CCF-1975.34 between Politecnico di Milano and King Abdullah University of Science and Technology and by the project EMPATIA@Lecco ID: 2016-1428. SW is supported by the Polish Ministry of Science and Higher Education program 'Mobility Plus' through Grant No. 1663/MOB/V/2017/0.
JournalNew Journal of Physics
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