DocumentCode :
748081
Title :
A novel apparatus for measuring permeability of weak magnetic materials
Author :
Qing, He ; Zhengkun, Li
Author_Institution :
Harbin Inst. of Technol., China
Volume :
54
Issue :
2
fYear :
2005
fDate :
4/1/2005 12:00:00 AM
Firstpage :
730
Lastpage :
733
Abstract :
Weak magnetic materials are widely used for electric and electronic devices. In this paper, a novel apparatus is described for measuring the dc permeability μr of this material more precisely and easily. From the variation of a mutual inductance value in two different conditions, i.e., with and without the specimen situated in the gaps formed by a pair of cores, the permeability of the specimen can be obtained with a simple calculation. The advantage of this method is that only the ratio of two mutual inductance values is needed and the knowledge about exact mutual inductance values is not necessary. To eliminate the influence of distorted field distribution at the edges of the gaps, some corrections are derived from electromagnetic field calculation. The measurement uncertainty of (μr-1) is about 8.7% for a specimen with μr=1.0013. This apparatus can be directly used for specimens in large plate shape so that the tedious preparation of specimens of special shape is unnecessary. Therefore, it may be used for industrial procedures where the dc permeability of the weak material is important.
Keywords :
magnetic materials; magnetic permeability measurement; measurement uncertainty; electric devices; electromagnetic field calculation; electronic devices; field distribution; magnetic measurements; material DC permeability; measurement uncertainty; mutual inductance; permeability measurement; weak magnetic materials; Coils; Distortion measurement; Helium; Inductance; Magnetic field measurement; Magnetic materials; Metrology; Permeability measurement; Shape measurement; Thickness measurement; Magnetic measurements; permeability; weak magnetic material;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/TIM.2005.843556
Filename :
1408275
Link To Document :
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