Zobrazeno 1 - 10
of 101
pro vyhledávání: '"M.D. Plimmer"'
Publikováno v:
Comptes Rendus Physique
Comptes Rendus Physique, 2019, 20, pp.129-139. ⟨10.1016/j.crhy.2018.11.007⟩
Comptes Rendus Physique, 2019, 20, pp.129-139. ⟨10.1016/j.crhy.2018.11.007⟩
We review measurements of the Boltzmann constant, k, the value of which is soon to be fixed at exactly 1.380 649 × 10 − 23 J⋅K−1 for the future revised Systeme international of units. In addition to a description of the theoretical background
Autor:
Pan Changzhao, Laurent Pitre, Yaonan Song, Haiyang Zhang, M.D. Plimmer, F. Sparasci, Wenjing Liu, Ercung Luo, Hui Chen, Bo Gao, Chen Yanyan, Dongxu Han
Publikováno v:
Cryogenics. 97:1-6
This article describes the construction and thermal characterization of a cryogen-free cryostat designed for single-pressure refractive index gas thermometry (SPRIGT) of helium-4 in the range 5–25 K. The system is cooled using a G-M type two-stage
Possible two-photon absorption in the near-infrared region observed by cavity ring-down spectroscopy
Autor:
M.D. Plimmer, J. T. Zhang, Hong-Wei Chu, Jing-Ting Luo, Lei Yang, Yong-Jian Ma, Lin Hong, XiaoJuan Feng, Hui-Bin Sun
Publikováno v:
Optics express. 28(26)
Two-photon absorption spectra are difficult to observe using direct absorption spectroscopy especially in the near-infrared region. Cavity ring-down spectroscopy is a promising absorption spectroscopy technique which has been widely applied to linear
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 210:82-90
The performances of a multi-spectral fit for the spectra of pressure-broadened overlapping lines (R9F1, R9F2) of 12CH4 in binary mixtures with N2 were studied by applying different lineshape models, from the simplest Voigt profile (VP) to the Harmann
Autor:
Changzhao Pan, F. Sparasci, M.D. Plimmer, Bo Gao, Dongxu Han, Laurent Pitre, Hui Chen, Xiangjie Kong, Jiangfeng Hu, Yaonan Song, Ercang Luo, Haiyang Zhang, Wenjing Liu
Publikováno v:
Metrologia. 58:059501
Autor:
F. Sparasci, Bo Gao, Ercang Luo, Laurent Pitre, P. Lin, Yingming Chen, X.J. Feng, M.D. Plimmer, J.T. Zhang
Publikováno v:
Measurement. 103:258-262
Refractive index gas thermometry (RIGT) uses the dependence of the relative dielectric permittivity on the density of a noble gas (He), typically measured with a temperature-controlled resonator. On an isotherm, to a good approximation, the slope of
Autor:
M.D. Plimmer, Haiyang Zhang, Xiangjie Kong, Dongxu Han, Jiangfeng Hu, Hui Chen, F. Sparasci, Ercang Luo, Laurent Pitre, Changzhao Pan, Yaonan Song, Wenjing Liu, Bo Gao
Publikováno v:
Metrologia. 57:065006
We describe measurements of thermodynamic temperature in the range 5 K to 24.5561 K (the triple point of neon) using single-pressure refractive-index gas thermometry (SPRIGT) with 4He. In the wake of the May 2019 re-definition of the kelvin and its a
Publikováno v:
Vacuum. 122:245-249
The continuous expansion method is widely used by National metrology institutes for traceability of vacuum measurements below 10−3 Pa. It is usually implemented using a fixed conductance such as a small circular orifice. This article describes how
Autor:
Laurent Pitre, Bo Gao, Ercang Luo, Dongxu Han, Changzhao Pan, Pascal Gambette, Bo Yu, Haiyang Zhang, Yingwen Liu, Hui Chen, M.D. Plimmer
Publikováno v:
Measurement. 160:107807
To achieve an uncertainty of 0.25 mK in single-pressure refractive-index gas thermometry (SPRIGT), the relative pressure variation of He-4 gas in the range 30 kPa to 120 kPa, should not exceed 4 ppm (k = 1). To this end, a novel pressure control syst
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 245:106888
A spectral line list for methane in the 6075.3–6078 cm−1 region with the intensity cutoff of 1 × 10−26 cm/molecule at 296 K is presented. We have accurately measured 96 line positions by using cavity ring-down spectroscopy with temperature-con