Direct determination of thermodynamic temperature by an optical method based on atomic absorption spectroscopy

Xiaokuan Li; Yudong Li; Yali Liu; Liangsen Feng; Wei Li; Xinliang Li

doi:10.1117/12.2667538

6 March 2023 Direct determination of thermodynamic temperature by an optical method based on atomic absorption spectroscopy

Xiaokuan Li, Yudong Li, Yali Liu, Liangsen Feng, Wei Li, Xinliang Li

Author Affiliations +

Proceedings Volume 12553, Fourth International Conference on Optoelectronic Science and Materials (ICOSM 2022); 125530B (2023) https://doi.org/10.1117/12.2667538
Event: 2022 4th International Conference on Optoelectronic Science and Materials (ICOSM2022), 2022, Henfei, China

Abstract

Doppler broadening thermometry (DBT) takes advantage of the high resolution characteristic of laser absorption spectroscopy to obtain thermodynamic temperature by measuring optical frequency. It is one of the research hotspots in the field of thermodynamic temperature measurement after the Kelvin redefinition in 2018. In this paper, the direct absorption spectroscopy based on Cesium (¹³³Cs) D1 (6S_1/2→6P_1/2) line was measured, and the thermodynamic temperature of atomic gas in thermal equilibrium state was obtained by extracting Doppler width of absorption line. The experimental results showed that average relative error of thermodynamic temperature was 0.01% and the standard deviation was 0.14% after 50 rounds of testing at 303.15 K. These research results prove the feasibility of Doppler broadening temperature measurement, and provide research support for the realization and transfer of thermodynamic temperature.

Citation Download Citation

Xiaokuan Li, Yudong Li, Yali Liu, Liangsen Feng, Wei Li, and Xinliang Li "Direct determination of thermodynamic temperature by an optical method based on atomic absorption spectroscopy", Proc. SPIE 12553, Fourth International Conference on Optoelectronic Science and Materials (ICOSM 2022), 125530B (6 March 2023); https://doi.org/10.1117/12.2667538

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KEYWORDS

Temperature metrology

Doppler effect

Thermodynamics

Thermometry

Absorption spectroscopy

Cesium

Calibration

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