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| Study on the Long Term Stability on the Superfluid Transition Temperature of Helium |
| LIN Peng1,YU Li-hong2,ZHANG Zhe1 |
1. National Institute of Metrology, Beijing 100013, China
2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract The long term stability of the superfluid transition temperature of helium has been studied in the past ten years using six cells sealed in 2000. The measurements are made in four laboratories with a regular procedure. A rhodium-iron resistance thermometer with series number of 229841 is used at forty-three measurements to realize the superfluid transition temperature of helium with the standard deviation of 0.035 mK.
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［4］林鹏,毛玉柱,洪朝生.一种新型低温固定点器件—4Heλ转变密封瓶［J］.低温物理学报,2000,22（2）:149-155.
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［6］Lin P, Mao Y Z, Yu L H, et al. Studies on a sealed-cell lambda-point device for use in low temperature thermometry［J］.Cryogenics,2002 42(8): 443-450.
［7］Peroni I, Pavese F, Ferri D, et al. A sealed cell for the accurate realisation of the λ-point of 4He［C］//Proceedings of 8th International Symposium on Temperature and Thermal Measurements in Industry and Science, Berlin, 2002,391-396.
［8］Lin P, Mao Y Z, Hong C S, et al. Realization of the lambda transition temperature of 4He using sealed cells［C］//Temperature, Its Measurement and Control in Science and Industry, New York, 2003, 191-195. |
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2011, Vol. 32 
