焦耳天平磁场系统关键技术研究  

Crucial techniques on the magnetic system of Joule balance

作　　者：韩冰[1,2,3] 张钟华[3] 贺青[3] 李正坤[3] 李辰[4] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]河北大学质量技术监督学院,保定071002 [3]中国计量科学研究院,北京100013 [4]清华大学精密仪器与机械系,北京100084

出　　处：《仪器仪表学报》2010年第6期1435-1440,共6页Chinese Journal of Scientific Instrument

基　　金：国家科技支撑计划(2006BAF06B01)资助项目

摘　　要：结合最近受到普遍重视的用于定义量子质量基准的焦耳天平方案,提出了一种全新的空间尺寸配比的轴对称激励线圈组结构。利用解析方法和数值计算证明通过合理配置共轴轴对称激励线圈组几何参数,当内部激励线圈和外部激励线圈的间距R与激励线圈与悬挂线圈的距离H满足R2=4/3H2,内部激励线圈、外部激励线圈、悬挂线圈匝数比满足10 000∶2 700∶430时,在焦耳天平磁场对称平面附近会形成轴向长度为2 cm的环形磁场均匀区,在该均匀区焦耳天平线圈系统互感参数具有四阶均匀性,满足互感结构参数M的准确测量要求。This paper presents a kind of axisymmetric coil system with novel dimension scale aiming at Joule balance that is used to define the quantum mass standard and is lately paid more attention to.Analytical modeling and numerical computation show that an annular homogeneous magnetic field with 2 cm axial length will exist in the symmetrical plane of the magnetic system of Joule balance through reasonably configure the geometrical parameters of the axisymmetric coil system.The conditions are that the distance between the inner and outer exciting coils R and the distance between exciting coils and suspended coil H satisfy the equation R2=4/3H2,and the ratio of the number of turns of inner,outer exciting coils and suspended coil satisfies the requirement of 10 000∶2 700∶430.In the annular homogeneous magnetic field,mutual inductance M possesses forth order homogeneity,which satisfies the requirement of accurate measurement of mutual inductance M.

关 键 词：互感参数 磁场系统 焦耳天平 

分 类 号：TB971[一般工业技术—计量学]