焦耳天平（量子质量基准）磁场系统的不确定度分析

韩冰; 贺青; 李正坤; 李辰

doi:10.3969/j.issn.1000-1158.2011.02.13

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计量学报 ›› 2011, Vol. 32 ›› Issue (2) : 152-157. DOI: 10.3969/j.issn.1000-1158.2011.02.13

焦耳天平（量子质量基准）磁场系统的不确定度分析

韩冰^1,2,贺青³,李正坤³,李辰⁴

作者信息 +

Uncertainty Analysis on the Magnetic System of Joule Balance, a Quantum Mass Standard

HAN Bing^1,2,HE Qing³,LI Zheng-kun³,LI Chen⁴

Author information +

文章历史 +

摘要

基于焦耳天平激励线圈系统的具体结构，分析了磁场系统几何中心磁场强度的不确定度分量，磁场的相对合成标准不确定度ΔH/H达到1.8×10^-3。证明了影响焦耳天平磁场最大的不确定度分量来源于线圈中加载电流的不确定度u(I),它对磁场的相对合成标准不确定度ΔH/H影响达到1.8×10^-3,因此推荐采用高稳定的恒流源来较少焦耳天平磁场的不确定度。

Abstract

Based on the special structure of exciting coils system of Joule balance, the uncertainty sources of the magnetic density in the geometrical center of magnetic field was analysed and evaluated.The relative combined standard uncertainty of magnetic field in ΔH/H was 1.8×10^-3 In addition, it was proved that the largest components of uncertainty were due to terms with u(I),which was 1.8×10^-3 contribution to relative combined standard uncertainty in ΔH/H.Therefore the high-precision constant-current source was recommended to reduce uncertainty of magnetic field of Joule Balance.

导出引用

韩冰,贺青,李正坤,李辰. 焦耳天平（量子质量基准）磁场系统的不确定度分析[J]. 计量学报. 2011, 32(2): 152-157 https://doi.org/10.3969/j.issn.1000-1158.2011.02.13

HAN Bing,HE Qing,LI Zheng-kun,LI Chen. Uncertainty Analysis on the Magnetic System of Joule Balance, a Quantum Mass Standard[J]. Acta Metrologica Sinica. 2011, 32(2): 152-157 https://doi.org/10.3969/j.issn.1000-1158.2011.02.13

中图分类号： TB97

参考文献

1］Kibble B P.A measurement of the gyromagnetic ratio of the proton by the strong field method［C］// Atomic Masses and Fundamental Constants,New York: Plenum,1976.
［2］Robinson I A, Kibble B P. The NPL moving-coil apparatus for measuring Planck"s constant and monitoring the kilogram［J］.IEEE Trans Instrum Meas, 1997, 46(2): 596-600.
［3］Mills I M,Mohr P J,Terry J Q,et al.Redefinition of the kilogram: a decision whose time has come［J］.Metrologia,2005,42(2) :71-80.
［4］Steiner R L，Williams E R, Newell D B,et al.Towards an electronic kilogram: an improved measurement of the Planck constant and electron mass［J］.Metrologia,2005, 42(5):431-441.
［5］Brown G V,Flax L.Superposing of semiinfinite solenoids for calculating magnetic fields of thick solenoids［J］.Appl Phy, 1962,35(2):65-70.
［6］Zhang Z, He Q, Li Z.An approach for improving the watt balance［C］//Filippo LEVI and Macro PISANI, CPEM2006,Torino, Italy,2006.
［7］JJF 1059—1999,Guide to estimate the measurement uncertainty［S］.