Title :
Status of the BIPM watt balance
Author :
Fang, H. ; Kiss, A. ; Robertsson, L. ; Zeggagh, A. ; Lan, J. ; De Mirandés, E. ; Solve, S. ; Picard, A. ; Stock, M.
Author_Institution :
Bur. Int. des Poids et Mesures (BIPM), Sèvres, France
Abstract :
This paper presents progress on the BIPM watt balance project. After a first measurement of the Planck constant in air at the 10-5 level, an improvement of a factor of five of the type A uncertainty has been obtained by refining the velocity measurement, now based on a three-axis interferometer system. Currently, the experiment is being transferred inside a vacuum enclosure located in a dedicated laboratory with improved thermal and vibrational isolation which we expect will further reduce the measurement uncertainty.
Keywords :
interferometers; measurement uncertainty; velocity measurement; vibration isolation; wattmeters; BIPM watt balance project; Planck constant measurement; measurement uncertainty; thermal isolation; three-axis interferometer system; vacuum enclosure; velocity measurement; vibrational isolation; Coils; Current measurement; Laboratories; Magnetic field measurement; Temperature measurement; Velocity measurement; Voltage measurement; Interferometer; Kilogram; Mass metrology; Planck constant; Primary electrical standards; Watt balance;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6250984
