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| ON THE ERROR OF MEASUREMENT OF FEEBLY MAGNETIC MATERIAL IN REGARD TO DEMAGNETIZING FIELD |
| CHEN Duxing; LI Bozang (Beijing Research Institute of Metallurgy) |
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Cite this article:
CHEN Duxing; LI Bozang (Beijing Research Institute of Metallurgy). ON THE ERROR OF MEASUREMENT OF FEEBLY MAGNETIC MATERIAL IN REGARD TO DEMAGNETIZING FIELD. Acta Metall Sin, 1983, 19(5): 141-148.
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Abstract An over-optimistic assessment in accuracy is often resulted from the magnetization measurement by the current standard methods for the feebly magnetic materials due to ignoring the significant influence of demagnetizing field on the ballistic method. Analysis is reported on the effect of demagnetizing field upon the feebly magnetic measurement, and calculation is presented to two kinds of ballistic demagnetizing factors which are about non-magnetic cylindrical specimen itself and about its measuring coil. Thus, the errors of H and M measurements in regard tO the demagnetizing field and their correct method as well are given. It may be suggested that a set of standard dimensions for the feebly magnetic measurement is available.
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Received: 18 May 1983
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1 ASTM A342-64 (1970) , 1971 Annual Book of ASTM Standards, Part 8, ASTM, 1971, p. 38．
2 直流与交流磁测量,刘湘元等译,上海科学技术出版社,1964,p.100．
3 Bozorth, R. M., Ferromagnetism, D. Van Nostrand Co., 1956, p. 846． |
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