Chinese Optics Letters, Vol. 17, Issue 6, 060201 (2019)
Cesium atomic Doppler broadening thermometry for room temperature measurement
Yijie Pan1,*, Wenhan Liao1,2, He Wang1,3, Yan Yao2, Jinhui Cai2, and Jifeng Qu1,**
- 1Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China
- 2College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China
- 3School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
Atomic Doppler broadening thermometry (DBT) is potentially an accurate and practical approach for thermodynamic temperature measurement. However, previous reported atomic DBT had a long acquisition time and had only been proved at the triple point of water, 0°C, for the purpose of determination of the Boltzmann constant. This research implemented the cesium atomic DBT for fast room temperature measurement. The Cs133 D1 (6S1/2 → 6p1/2 transition) line was measured by direct laser absorption spectroscopy, and the quantity of thermal-induced linewidth broadening was precisely retrieved by the Voigt profile fitting algorithm. The preliminary results showed the proposed approach had a 4 min single-scan acquisition time and 0.2% reproducibility. It is expected that the atomic DBT could be used as an accurate, chip-scale, and calibration-free temperature sensor and standard.
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