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.
出处
《计量学报》
EI
CSCD
北大核心
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)
