^4He超流转变温度复现研究  

Study on the Realization of the Temperature of 4 He Superfluid-Transition

作　　者：林鹏[1] 毛玉柱[1] 张庆庚[1] 喻力弘[1] 

机构地区：[1]中国科学院理化技术研究所,北京100080

出　　处：《计量学报》2001年第4期241-245,共5页Acta Metrologica Sinica

基　　金：国家自然科学基金 ( 195 740 5 4)

摘　　要：本文介绍一种复现4He超流转变点 ( 2 1 768K)的密封瓶器件 ,复现方法简单 ,易于实现 ,可获得长达数小时的4He超流转变温坪。改变热流量 ,测出不同热流下对应的下压温坪值 ,外推到零热流 ,得到超流转变温度复现值。 3只密封瓶多次复现的标准偏差 (复现性 )为 0 0 4mK。This paper introduces a sealed cell using to realize the 4He superfluid-transition temperature. The transition plateau could be kept as long as several hours. By changing the heat flow passed through the capillary of the sealed cell, a series of plateaus have been made. The superfluid-transition temperature is determined by extrapolating to zero heat flow. The standard deviation of several realizations for three sealed cells is 0.04 mK.

关 键 词：固定点 复现 氦 超流转变温度 超流转变点 温度测量 温度计 密封瓶 毛细管结构 

分 类 号：TB942[一般工业技术—计量学]