NDLI: A versatile and sensitive balanced magnetic comparator

Content Provider	IEEE Xplore Digital Library
Author	Baer, J. Heckler Jr., C.
Copyright Year	1965
Abstract	A magnetic circuit is described wherein a pair of matched square-loop magnetic cores are connected in a balanced manner to act as a sensitive null-detector called a balanced magnetic comparator. A material characteristic and a mode of operation that significantly increase the sensitivity over that of the basic circuit are also described. The sensitivity of the balanced magnetic comparator is such that low-level transducers/sensors can be directly connected to the input winding and produce an unbalanced condition. Thus, by means of successive approximation, the measurand signal from a sensor can be converted to digital form without interposing semiconductor amplifiers. Comparator circuits have been operated over a temperature range of 100°C with a resolution of 10 μA, and a 7-bit accuracy. In this use as an A-D converter the balanced magnetic comparator is unbalanced by the current output from a transducer, and balance is restored by precision weight currents. These weight currents can be generated in pulse form by transistorized circuits that use additional comparators operating in a dynamic mode. In this dynamic mode the time function of the output waveform is used, rather than polarity, as in the A-D converter. These comparators provide feedback control to the transistors in order to achieve the necessary precision in the weight-current pulses. Using a balanced comparator rather than a single square-loop core has a major advantage in that the offset contributed by the threshold of a single core is eliminated.
Sponsorship	IEEE Magnetics Society
Starting Page	364
Ending Page	368
Page Count	5
File Size	617125
File Format	PDF
ISSN	00189464
Volume Number	2
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1966-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic semiconductors Transducers Magnetic sensors Magnetic circuits Magnetic cores Magnetic materials Sensor phenomena and characterization Semiconductor optical amplifiers Temperature distribution Temperature sensors
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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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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