Nondestructive metal sheet testing using the phase angle of the electromagnetic fields
作者:
G.A.Girgis,
AwadBastawros,
期刊:
IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education, Reviews)
(IET Available online 1986)
卷期:
Volume 133,
issue 3
页码: 137-138
年代: 1986
DOI:10.1049/ip-a-1.1986.0024
出版商: IEE
数据来源: IET
摘要:
An exciting cylindrical coil fed with AC current is placed in front of a metallic sheet under test. Variation of the coil impedance due to the presence of the sheet depends on the purity and thickness of the sheet. It is shown that the phase angle rather than the amplitude of the change of the coil impedance is a good measure for testing.
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