NDLI: Proposal and theoretical evaluation of the active shield with self-tunable loop current array

Content Provider	IEEE Xplore Digital Library
Author	Goleman, K. Sasada, I.
Copyright Year	1965
Abstract	An active shielding module consisting of self-tunable loop current array is proposed. Loop currents in the array are independently controlled by the magnetometer dedicated to each of them. Since magnetic field decays as 1/r/sup 3/ along the distance r, the magnetic noise should be overcompensated at the location of the loop current array to provide a good cancellation in the shielded area. In order to enable overcompensation in a stable feedback system, a small additional loop is combined to the magnetometer that reduces magnetic direct coupling from the main loop current to the magnetometer. Shielding performance of an array consisting of 25 (5 by 5) loop currents is evaluated numerically on the 4 m by 4 m evaluation plane for the magnetic dipole disturbance source placed 3-4 m beyond the array. Attenuation of magnetic field is calculated as 1/15-1/5 over the evaluation plane.
Sponsorship	IEEE Magnetics Society
Starting Page	4084
Ending Page	4086
Page Count	3
File Size	259179
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Proposals Magnetic shielding Magnetometers Magnetic field measurement Coils Magnetic noise Magnetic fields Magnetic materials Feedback loop Couplings magnetic field Active magnetic shield dipole array loop current
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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