Molecular gas thermometry on acetylene using dual-comb spectroscopy: analysis of rotational energy distribution
Molecular gas thermometry on acetylene using dual-comb spectroscopy: analysis of rotational energy distribution
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使用双梳光谱法进行乙炔分子气体测温：旋转能量分布分析
DOI：
10.1007/s00340-018-6933-x
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Inaba Hajime
中科院分区：
文献类型：
--
作者：
Shimizu Yukiko;Okubo Sho;Onae Atsushi;Yamada Koichi M. T.;Inaba Hajime
我们提出并证明了一种新的方法，用于温度测定使用双梳光谱和一种新的分析技术，“旋转状态分布测温：RDT。”在室温下，我们用双梳谱获得了12 C2 H2的一个振动-转动带的光谱轮廓。通过将线轮廓拟合到高斯函数来确定每个跃迁的线中心吸光度。引入了一个模型函数，该函数将分子的旋转温度与线中心吸光度的分布联系起来;通过将该分布拟合到模型函数来确定气体温度。测定的温度与用铂电阻温度计测得的细胞壁温度在0.6K以内一致。此外，使用在这项研究中获得的光谱轮廓，我们比较本分析与两个传统的方法来确定气体温度;一个是基于线中心的吸光度比，和其他的多普勒宽度。本方法充分利用了双梳光谱的最高特性，并有可能提供快速和精确的测温。
We propose and demonstrate a novel method for temperature determination using dual-comb spectroscopy and a novel analysis technique, “Rotational-state Distribution Thermometry: RDT.” We obtained the spectral profile of a vibration–rotation band of12C2H2using dual-comb spectroscopy at room temperature. The line-center absorbance was determined for each transition by fitting the line profile to a Gaussian function. A model function that relates the rotational temperature of the molecule to the distribution of the line-center absorbance was introduced; the gas temperature was determined by fitting the distribution to the model function. The determined temperature agrees to within 0.6 K with the cell-wall temperature measured with a platinum resistance thermometer. In addition, using the spectral profile obtained in this study, we compare the present analysis with two conventional methods for determining the gas temperature; one is based on the line-center absorbance ratio, and the other on the Doppler width. The present method takes full advantage of the supreme characteristics of dual-comb spectroscopy and has the potential to offer fast and precise thermometry.