NDLI: Magnetooptical ammeter

Content Provider	IEEE Xplore Digital Library
Author	Matsushita, S. Konishi, S. Sakurai, Y.
Copyright Year	1965
Abstract	A Kerr magnetooptical ammeter is described which uses a Permalloy thin film in order to make contact-free measurements of the current flowing through a conductor. The device is useful for current measurement in high-voltage lines. In this ammeter, the strength of the current is measured by measuring the position of a domain wall which traverses a narrow channel sensor composed of a Permalloy thin film under the stray magnetic field due to a current. Contact-free observation of the domain wall is achieved by means of a Kerr magnetooptical apparatus using a high-pressure mercury lamp as a light source. The easy axis of the Permalloy thin film is parallel to the stray magnetic field. The domain wall traverses a distance of 15 mm at 70 amperes. The size of the sensor is 0.5 by 20 mm.
Sponsorship	IEEE Magnetics Society
Starting Page	569
Ending Page	571
Page Count	3
File Size	275514
File Format	PDF
ISSN	00189464
Volume Number	6
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1970-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ammeters Current measurement Magnetic field measurement Magnetic domain walls Magnetic sensors Magnetooptic devices Position measurement Thin film sensors Magnetic films Transistors
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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