用黑体辐射法复现铝凝固点  

Realization of the Freezing Point of Aluminium with the Blackbody Radiation Method

作　　者：陈冰泉[1] 赵琪[1] 

机构地区：[1]中国计量科学研究院

出　　处：《计量学报》1992年第2期114-119,共6页Acta Metrologica Sinica

摘　　要：本文叙述用精密直流光电温度计复现纯金属铝凝固点的实验装置和实验方法,复现铝凝固点的总不确定度小于50mK,置信度为99%。实验中对3个铝点黑体石墨坩埚容器的凝固温度进行了多次测量,3个容器的铝凝固点温度之差不大于10mK。在8个月的时间内,对同一铝点坩埚容器的铝凝固点温度进行了11次测量,其标准偏差为15mK,长期重复性也很好。The freezing point of aluminium is one of the defining fixed points of the ITS-90.The experimental apparatus and process for the realization of the aluminium freezing point are described in this paper.Three blackbody graphite crucibles of aluminium have been used for the realization.The emissivity of the blackbody cavity with 2 mm-aperture is more than 0.9999.The total uncertainty of the realization of the aluminium freezing point is less than 50mK at a 99% confidence level.

关 键 词：铝 凝固点 黑体辐射法 光电温度计 

分 类 号：TG292[金属学及工艺—铸造]