摘要
大电流比较仪具有高准确度,线性特性好,低漂移等特点,因此被广泛应用于实验室和工业现场。在大电流比较仪的设计中磁屏蔽是非常重要的。长期以来,磁屏蔽效能的计算是依靠解析的方法,误差较大。文章利用目前流行的数值计算方法,对电流比较仪磁屏蔽效能进行了分析。文中提出了电流比较仪磁屏蔽效能问题的数学模型的建立方法,讨论了有限元法在电流比较仪磁屏蔽效能计算中的应用,给出了磁屏蔽体二维和三维模型的计算结果。
All kinds of heavy current comparators possess the notable perfermance of low drift,high accuracy, and linearity. An important design technique is the magnetic shielding. Although the estimation of magnetic shielding effectiveness was described, the more effective analysis and calculation are needed in industry and laboratory.A new numerical method used to calculate the magnetic shielding effectiveness of comparator is given and the magnetic shielding effectiveness of comparator is analyzed. The FEM mathematical model,and calculated results are given.
出处
《计量学报》
CSCD
北大核心
2003年第4期321-324,共4页
Acta Metrologica Sinica
基金
国家自然科学基金(50277018)
关键词
计量学
电流比较仪
磁屏蔽
屏蔽效能
有限元法
Metrology
Current comparater
Magnetic shield
Shielding effectiveness
FEM
