Thickness Measurement of Metal Plates Using Swept-Frequency Eddy Current Testing and Impedance Normalization

研究成果: Article査読

32 被引用数 (Scopus)

抄録

Electromagnetic nondestructive testing signals generally change with the electromagnetic properties of the test objects. In the determination of metal thickness by electromagnetic nondestructive testing methods, the material's electrical conductivity and magnetic permeability are required but practically unavailable or inexact. This paper investigated the use of swept-frequency eddy current testing (SFECT) and impedance normalization to measure a metal plate's thickness, without the prior knowledge of its exact conductivity and permeability. Analytical and experimental studies were conducted separately on nonmagnetic and ferromagnetic metal plates. For nonmagnetic metal plates, it was found that the plate thickness can be determined by using the extreme values (maximum or minimum) of the normalized SFECT impedances' phases. For ferromagnetic metal plates, phase and resistance of very low frequency normalized impedance were found to be 'permeability-independent,' and a conductivity-insensitive function was constructed. The thickness of a ferromagnetic plate was evaluated by using this function. This paper concludes that it is possible to measure a metal plate's thickness by SFECT and impedance normalization even without the prior knowledge of the conductivity and permeability of the test object.

本文言語English
論文番号7937800
ページ(範囲)4558-4569
ページ数12
ジャーナルIEEE Sensors Journal
17
14
DOI
出版ステータスPublished - 2017 7月 15
外部発表はい

ASJC Scopus subject areas

  • 器械工学
  • 電子工学および電気工学

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