THE DEVELOPMENT OF A MAGNETO-OPTIC CURRENT SENSOR FOR HIGH, PULSED CURRENTS
A description is given of a current measurement system based on the Faraday rotation in a one-turn fibre coil. It is shown that an ultra-low birefringence "spun" single mode fibre is extremely suitable in a magneto-optic current sensor. The properties of this fibre were investigated. Measurements of high, pulsed currents (I-max about 1 MA; f = 25 KHz), with good accuracy (1%) and in agreement with conventional method, are presented. Because of the low birefringence, this good accuracy was also reached in the low current region (theta' <or= pi/4 rad). In order to compute the value of large current unambiguously from the Faraday rotation, a set up with a beam splitter prism and a second detector was constructed, and some measurements were carried out.
Bibliographic Reference: WRITE TO FOM-INSTITUUT VOOR PLASMAFYSICA, RIJNHUIZEN, NIEUWEGEIN (THE NETHERLANDS), MENTIONING REPORT I.R. 85/039, 1985
Record Number: 1989124082600 / Last updated on: 1987-01-01
Available languages: en