Recent Development on the Joule Balance at NIM

Author

Zhang, Zhonghua ; He, Qing ; Li, Zhengkun ; Lu, Yunfeng ; Zhao, Jianting ; Bing Han ; Fu, Yaqiong ; Li, Chen ; Li, Shisong

Author_Institution

Nat. Inst. of Metrol., Beijing, China

Volume

60

Issue

7

fYear

2011

fDate

7/1/2011 12:00:00 AM

Firstpage

2533

Lastpage

2538

Abstract

The precise measurement of Planck constant h to establish a kind of quantum mass standard is an important but very difficult work. The Joule Balance method, for the same purpose but different from Watt Balance method, has been going on at the National Institute of Metrology for three years. All the measurements were carried out in the atmosphere of an air-conditioned room. The uncertainty is several parts in 10⁴ (k=1) and expected to be improved when superconducting coils and other approaches are used further. The principle and progress are described here.

Keywords

constants; mass measurement; measurement standards; measurement uncertainty; superconducting coils; Joule Balance method; NIM; National Institute of Metrology; Planck constant precise measurement; quantum mass standard; superconducting coils; Coils; Current measurement; Force; Inductance; Inductance measurement; Inductors; Uncertainty; Joule balance; Plank constant; Watt balance; mutual inductance; quantum mass standard;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2011.2113930

Filename

5732692