28 June 2015 to 2 July 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Determination of thermodynamic temperature between 4.2K and 24.5 K by a new constant pressure refractive index gas thermometer

Not scheduled
2h
JW Marriott Starr Pass Resort

JW Marriott Starr Pass Resort

Tucson, Arizona USA
Poster Presentation CEC-11 - Safety, Reliability, and Standards

Speaker

Dr Bo GAO (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

Description

A new constant pressure refractive index gas thermometer (CPRIT) is proposed that measures the thermodynamic temperatures T from 4.2 K to 24.5 K with a quasi-spherical microwave resonator. The pressure fluctuation plays the essential entry for the measurement uncertainty by traditional refractive index gas thermometers operating above the triple point of water and constant volume gas thermometers running from 4.2K to 24.5K. We present a new method with the proposed CPRIT for stabilizing gas pressures in the fractional differences within one part of million in the temperature from 4.2 K to 24.5 K. The gas pressure stabilization promote the stability of measurement temperature so to decrease the measurement uncertainty. In addition, we propose a new procedure to minimize the deformation of the quasi-spherical cavity, and a new feature of gas fill ducts to decrease their disturbance for microwave resonances in the cavity. We report in this paper the theoretical model for the CPRIT and the analyses for all the imperfection disturbances for microwave resonant measurements. The theoretical analysis shows that the proposed CPRIT is anticipated to achieve a temperature measurement fluctuation bound with 25μK with helium as the working gas.

Primary author

Dr Bo GAO (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

Co-authors

Prof. Jintao ZHANG (National Institute of Metrology, China) Dr Laurent PITRE (LCM-Metrology-Laboratoire Commun de Metrologie LNE-Cnam,France) Dr Lihong YU (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences) Prof. Peng LIN (a)Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190,  China) Dr Xiaojuan FENG (National Institute of Metrology, China)

Presentation Materials

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