Title :
Measurements of the magnetic flux quantum, Planck constant, and elementary charge at VNIIM
Author :
Frantsuz, E.T. ; Gorchakov, Yu D. ; Khavinson, V.M.
Author_Institution :
D.I. Mendeleyev Res. Inst. of Metrol., St. Petersburg, USSR
fDate :
8/1/1992 12:00:00 AM
Abstract :
Tests of an electromechanical system developed for measurements of the magnetic flux quantum, Planck´s constant, and the elementary charge in SI units by a procedure based on a superconducting levitated mass have shown a precision of several parts in 106. When a special cryogenic measuring device is introduced into the system, the precision will increase to several parts in 107. Further improvements in the measuring setup should result in an uncertainty below 1 part in 107
Keywords :
Meissner effect; SQUIDs; constants; magnetic flux; magnetic levitation; magnetic variables measurement; units (measurement); Planck constant; SI units; VNIIM; ampere; cryogenic measuring device; electromechanical system; elementary charge; magnetic flux quantum; measurement uncertainty; superconducting levitated mass; Charge measurement; Current measurement; Electric variables measurement; Electromechanical systems; Force measurement; Magnetic field measurement; Magnetic flux; Magnetic levitation; Mechanical variables measurement; Superconducting coils;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
