Nonlinear magnetic error evaluation of a two-mode watt balance experiment

被引：27
作者：
Li, Shisong [1 ,2 ]
Zhang, Zhonghua [2 ]
Han, Bing [2 ]
机构：
[1] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
[2] Natl Inst Metrol, Beijing 100013, Peoples R China
来源：
METROLOGIA | 2013年 / 50卷 / 05期
关键词：
PLANCK CONSTANT; REDEFINITION; IMPROVEMENTS; KILOGRAM; DESIGN;
D O I：
10.1088/0026-1394/50/5/482
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The watt balance is operated in two asynchronous measurement modes to obtain the voltage-velocity ratio U/v and the force-current ratio mg/I, respectively. The magnetic flux density will change between the two modes when the effect due to the coil current is taken into account, particularly for watt balances using a soft magnetic material in the magnetic circuit. Normally, the linear component of the magnetic flux density change can be easily eliminated by reversing the coil current; however, the quadratic component remains as a systematic error, i.e. a non-linear error. In this paper, we use a theoretical analysis and a differential finite element method to investigate the behaviour of the quadratic dependence in a typical magnetic circuit. Several strategies are discussed to minimize this error in the magnetic system design for the watt balance.
引用
收藏
页码：482 / 489
页数：8
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