Experimental study on opening compensation for magnetic shields by current superposition

Ichiro Sasada, Y. Oonaka

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Abstract

A new method is studied experimentally by which magnetic fields coming in through an opening of a magnetic shield can be compensated. The horizontal component of the earth's field is targeted as an external magnetic field to be compensated by the method, in which a single figure-eight coil is used. A cylindrical shielding case is developed for this study using a Permalloy cylindrical case (outer diameter=68 cm, length=180 cm) with an opening at an end and Metglas 2705M amorphous ribbons, which are wound helically on the outer surface of the Permalloy case by 16 layers. A magnetic shaking field of 200 Hz is applied to only the amorphous layers by a toroidal shaking coil of 36 turns. The size of the figure-eight coil used is 74 cm in diameter with 30 turns. Residual magnetic field measured by a flux gate magnetometer in the horizontal center plane of the shielding case shows that the area where the amplitude of the residual magnetic field is within ±0.15 mG is extended by about 30 cm toward the opening.

Original languageEnglish
Pages (from-to)6984-6986
Number of pages3
JournalJournal of Applied Physics
Volume75
Issue number10
DOIs
Publication statusPublished - Dec 1 1994

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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