Alignment Procedure Used in the BIPM Watt Balance

被引：11

作者：

de Mirandes, Estefania ^{[1
]}

Fang, Hao ^{[1
]}

Kiss, Adrien ^{[1
]}

Solve, Stephane ^{[1
]}

Stock, Michael ^{[1
]}

Picard, Alain ^{[1
]}

机构：

[1] Bur Int Poids & Mesures, F-92310 Sevres, France

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2011年 / 60卷 / 07期

关键词：

Fundamental constants; kilogram; mass standard; watt balance; watt experiment; PLANCKS-CONSTANT;

D O I：

10.1109/TIM.2011.2144250

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The Bureau International des Poids et Mesures (BIPM) is developing a watt balance to measure accurately the Planck constant h by linking it to the kilogram. The kilogram is currently the only base unit of the International System of Units still defined by a material artifact. A fixed numerical value of h could be the basis for the expected future redefinition of the kilogram in terms of fundamental constants. One main concern of the watt balance experiment is the alignment of the involved vectors. In particular, the electromagnetic force exerted on the watt balance coil needs to be carefully aligned parallel to the gravitational force exerted on the test mass. To address this requirement, we have developed an original experimental procedure that has been validated with a test coil which is a prototype for the ultimate watt balance coil. The result is accurate enough to enable a determination of the Planck constant with a relative uncertainty of about 1 . 10(-8), which is the ultimate goal of the BIPM watt balance.

引用

页码：2415 / 2421

页数：7

共 9 条

[1] Tracing Planck's constant to the kilogram by electromechanical methods [J].