Title :
Current measurement system utilizing cryogenic techniques for the absolute measurement of the magnetic flux quantum
Author :
Endo, Tadashi ; Murayama, Yasushi ; Sakamoto, Yasuhiko ; Sakuraba, Toshiaki ; Shiota, Fuyuhiko
Author_Institution :
Electrotech. Lab., Ibaraki, Japan
fDate :
4/1/1989 12:00:00 AM
Abstract :
A series of systems composed of cryogenic devices such as a Josephson potentiometer and a cryogenic current comparator, developed to precisely measure a current with any value up to 1 A, is proposed. These systems will be used to measure the injected electrical energy with an uncertainty of the order of 0.01 p.p.m. or less in the absolute measurement of the magnetic flux quantum by superconducting magnetic levitation. Some preliminary experiments are described
Keywords :
Josephson effect; constants; cryogenics; electric current measurement; magnetic flux; magnetic levitation; superconducting junction devices; 1 A; Josephson potentiometer; absolute measurement; cryogenic current comparator; electric current measurement; magnetic flux quantum; superconducting magnetic levitation; Cryogenics; Current measurement; Electric variables measurement; Energy measurement; Frequency; Josephson junctions; Laboratories; Magnetic flux; Magnetic levitation; SQUIDs;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
