Title :
Re-defining the kilogram via a moving-coil apparatus
Author :
Kibble, B.P. ; Robinson, L.A. ; Belliss, J.H.
Author_Institution :
NPL, Teddington, UK
Abstract :
The goal of basing the definition of the kilogram on voltage and resistance measurements in terms of the Josephson and quantum Hall effects, which have an accuracy of 1 in 10/sup 9/, is addressed. The problems of accomplishing this using a moving-coil apparatus are discussed. In particular, consideration is given to measuring the voltage accurately enough, eliminating the refractive index of air, the stability of the magnetic flux density, interaction of the current in the coil with the magnetic circuit, reducing floor vibration and eliminating its effects, measuring g, and alignment problems.<>
Keywords :
Josephson effect; electric resistance measurement; mass measurement; moving-coil instruments; quantum Hall effect; units (measurement); voltage measurement; Josephson effects; alignment; kilogram; magnetic flux density; moving-coil apparatus; quantum Hall effects; refractive index of air; resistance measurements; stability; vibration; voltage measurement; Circuit stability; Current measurement; Density measurement; Electrical resistance measurement; Hall effect; Magnetic flux density; Particle measurements; Refractive index; Vibration measurement; Voltage measurement;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.109978
