Absolute temperature measurements by direct-frequency-comb spectroscopy

被引：1
|
作者：
Galzerano, Gianluca [1 ]
机构：
[1] CNR, Ist Foton & Nanotecnol, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy
来源：
MEASUREMENT | 2020年 / 164卷 / 164期
关键词：
Primary thermometry; Doppler broadening thermometry; Precision optical measurements; Optical frequency comb synthesizers; BOLTZMANN CONSTANT; MOLECULAR-SPECTROSCOPY; LASER SPECTROSCOPY; NOISE;
D O I：
10.1016/j.measurement.2020.107940
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The absolute temperature of acetylene gas is measured by an effective yet simple implementation of Doppler-broadening thermometry. At room temperature the combined measurement uncertainty is similar to 200 mK over 15 s measurement time. A large set of 28 lines in the near infrared region from 1.537 to 1.540 mu m, belonging to the P branch of the v(1) + v(3) rovibrational band of (C2H2)-C-12 and (CCH2)-C-13-C-12 at low pressure, has been addressed using for the first time a direct frequency-comb spectroscopic approach to retrieve the Doppler linewidths and hence the thermodynamic gas temperature. Experimental strate-gies to reach the millikelvin accuracy level are discussed. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：6
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